Claims for Patent: 7,169,780

Summary for Patent: 7,169,780

Title:	N-substituted hydroxypyrimidinone carboxamide inhibitors of HIV integrase
Abstract:	N-substituted 5-hydroxypyrimidin-6-one-4-carboxamides of formula (I): are described as inhibitors of HIV integrase and inhibitors of HIV replication, wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are defined herein. These compounds are useful in the prevention and treatment of infection by HIV and in the prevention, delay in the onset, and treatment of AIDS. The compounds are employed against HIV infection and AIDS as compounds per se or in the form of pharmaceutically acceptable salts. The compounds and their salts can be employed as ingredients in pharmaceutical compositions, optionally in combination with other antivirals, immunomodulators, antibiotics or vaccines. Methods of preventing, treating or delaying the onset of AIDS and methods of preventing or treating infection by HIV are also described ##STR00001##
Inventor(s):	Crescenzi; Benedetta (Rome, IT), Gardelli; Cristina (Ariccia, IT), Muraglia; Ester (Rome, IT), Orvieto; Federica (Rome, IT), Pace; Paola (Rome, IT), Pescatore; Giovanna (Cosenza, IT), Petrocchi; Alessia (Rome, IT), Poma; Marco (Grosseto, IT), Rowley; Michael (Axa, IT), Scarpelli; Rita (Rome, IT), Summa; Vincenzo (Velletri, IT), Nizi; Emanuela (Siena, IT)
Assignee:	Istitute Di Ricerche Di Biologia Molecolare P. Angeletti S.P.A. (Pomezia, IT)
Application Number:	10/493,280
Patent Claims:	1. A compound of Formula (I): ##STR00287## wherein R.sup.1 is (1) --H, (2) --C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)--C(.dbd.O)R.sup.b, ##STR00288## or --N(R.sup.a)C(.dbd.O)C(.dbd.O)N(R.sup.aR.sup.b), (3) --R.sup.k, (4) --C.sub.1-6 alkyl-R.sup.k, wherein: (i) the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --N(R.sup.a)C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.bR.sup.c), or --N(R.sup.a)--C.sub.2-6 alkyl-OH with the proviso that the --OH is not attached to the carbon alpha to N(R.sup.a); and (ii) the alkyl is optionally mono-substituted with --R.sup.s, --C.sub.1-6 alkyl-R.sup.s, --N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-R.sup.s, --N(R.sup.a)--C.sub.0-6 alkyl-R.sup.s, --O--C.sub.0-6 alkyl-R.sup.S, or --N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-R.sup.s; wherein R.sup.s is (a) aryl which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, methylenedioxy attached to two adjacent carbon atoms, or aryl; (b) a 4- to 8-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-16 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, oxo, aryl, or --C.sub.1-6 alkyl-aryl; or (c) a 5- to 7-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heteroaromatic ring is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, or aryl; (5) --C.sub.0-6 alkyl-O--C.sub.0-6 alkyl-R.sup.k, (6) --C.sub.0-6 alkyl-S(O).sub.n--C.sub.0-6 alkyl-R.sup.k, (7) --O--C.sub.1-16 alkyl-OR.sup.k, (8) --O--C.sub.1-16 alkyl-O--C.sub.1-6 alkyl-R.sup.k, (9) --O--C.sub.1-6 alkyl-S(O).sub.nR.sup.k, (10) --C.sub.0-6 alkyl-N(R.sup.a)--R.sup.k, (11) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.1-6 alkyl-R.sup.k, (12) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.1-6 alkyl-OR.sup.k, (13) --C.sub.0-6 alkyl-C(.dbd.O)--R.sup.k, (14) --C.sub.0-6 alkyl-C(.dbd.O)N(R.sup.a)--C.sub.0-6 alkyl-R.sup.k, (15) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)--C.sub.0-6 alkyl-R.sup.k, (16) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.k, or (17) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)C(.dbd.O)R.sup.k; R.sup.2 is --C.sub.1-6 alkyl which is optionally substituted with one or more substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --O--C.sub.1-6 alkyl, (5) --O--C.sub.1-6 haloalkyl, (6) --C(.dbd.O)R.sup.a, (7) --CO.sub.2R.sup.a, (8) --SR.sup.a, (9) --S(.dbd.O)R.sup.a, (10) --N(R.sup.aR.sup.b), (11) --C(.dbd.O)N(R.sup.aR.sup.b), (12) --N(R.sup.a)--C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.bR.sup.c), (13) --SO.sub.2R.sup.a, (14) --N(R.sup.a)SO.sub.2R.sup.b, (15) --SO.sub.2N(R.sup.aR.sup.b), (16) --N(R.sup.a)--C(R.sup.b).dbd.O, (17) --C.sub.3-8 cycloalkyl, (18) aryl, wherein the aryl is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C.sub.0-6 alkyl-N(R.sup.aR.sup.b), or --C.sub.1-6 alkyl substituted with a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-6 alkyl, oxo, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; or (19) a 5- to 8-membered monocyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heterocycle is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, phenyl, or naphthyl; with the proviso that none of the following substituents is attached to the carbon atom in the --C.sub.1-6 alkyl group that is attached to the ring nitrogen: halogen, --OH, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O; R.sup.3 is --H or --C.sub.1-6 alkyl; R.sup.4 is (1) C.sub.1-6 alkyl which is substituted with one or more substituents each of which is independently halogen, --OH, O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --NO.sub.2, --N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, or --N(R.sup.a)CO.sub.2R.sup.b, (2) C.sub.1-6 alkyl which is optionally substituted with one or more substituents each of which is independently halogen, --OH, or O--C.sub.1-4 alkyl, and which is substituted with 1 or 2 substituents each of which is independently: (i) C.sub.3-8 cycloalkyl, (ii) aryl, (iii) a fused bicyclic carbocycle consisting of a benzene ring fused to a C.sub.5-7 cycloalkyl, (iv) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, (v) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or (vi) a 9- or 10-membered fused bicyclic heterocycle containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein at least one of the rings is aromatic, (3) C.sub.2-5 alkynyl optionally substituted with aryl, (4) C.sub.3-8 cycloalkyl optionally substituted with aryl, (5) aryl, (6) a fused bicyclic carbocycle consisting of a benzene ring fused to a C.sub.5-7 cycloalkyl, (7) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, (8) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or (9) a 9- or 10-membered fused bicyclic heterocycle containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein at least one of the rings is aromatic; wherein each aryl in (2)(ii) or the aryl (3), (4) or (5) or each fused carbocycle in (2)(iii) or the fused carbocycle in (6) is optionally substituted with one or more substituents each of which is independently halogen, --OH, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --CN, --NO.sub.2, --N(R.sup.aR.sup.b), --C.sub.1-6 alkyl-N(R.sup.aR.sup.b), --C(.dbd.O)N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C.sub.1-6 alkyl-CO.sub.2R.sup.a, --OCO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)C(.dbd.O)R.sup.b, --N(R.sup.a)CO.sub.2R.sup.b, --C.sub.1-6 alkyl-N(R.sup.a)CO.sub.2R.sup.b, aryl, --C.sub.1-6 alkyl-aryl, --O-aryl, or --C.sub.0-6 alkyl-het wherein het is a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, and het is optionally fused with a benzene ring, and is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, or --CO.sub.2R.sup.a; each saturated heterocyclic ring in (2)(iv) or the saturated heterocyclic ring in (7) is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and each heteroaromatic ring in (2)(v) or the heteroaromatic ring in (8) or each fused bicyclic heterocycle in (2)(vi) or the fused bicyclic heterocycle in (9) is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, or --C.sub.1-6 alkyl-aryl; or alternatively R.sup.3 and R.sup.4 together with the N to which both are attached form a C.sub.3-7 azacycloalkyl which is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl or oxo; each R.sup.a, R.sup.b, R.sup.c, and R.sup.d is independently --H or --C.sub.1-6 alkyl; R.sup.k is carbocycle or heterocycle, wherein the carbocycle or heterocycle is optionally substituted with one or more substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (5) --O--C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (6) --NO.sub.2, (7) oxo, (8) --C(.dbd.O)R.sup.a, (9) --CO.sub.2R.sup.a, (10) --SR.sup.a, (11) --S(.dbd.O)R.sup.a, (12) --N(R.sup.aR.sup.b), (13) --C(.dbd.O)N(R.sup.aR.sup.b), (14) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (15) --N(R.sup.a)C(.dbd.O)R.sup.b, (16) --SO.sub.2R.sup.a, (17) --SO.sub.2N(R.sup.aR.sup.b), (18) --N(R.sup.a)SO.sub.2R.sup.b, (19) --R.sup.m, (20) --C.sub.1-6 alkyl-R.sup.m, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (21) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.0-6 alkyl-R.sup.m, (22) --C.sub.0-6 alkyl-O--C.sub.0-6 alkyl-R.sup.m, (23) --C.sub.0-6 alkyl-S--C.sub.0-6 alkyl-R.sup.m, (24) --C.sub.0-6 alkyl-C(.dbd.O)--C.sub.0-6 alkyl-R.sup.m, (25) --C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.m, (26) --C(.dbd.O)N(R.sup.a)--C.sub.0-6 alkyl-R.sup.m, (27) --N(R.sup.a)C(.dbd.O)--R.sup.m, (28) --N(R.sup.a)C(.dbd.O)--C.sub.1-6 alkyl-R.sup.m, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (29) --N(R.sup.a)--C(.dbd.O)--N(R.sup.b)--C.sub.0-6 alkyl-R.sup.m, (30) --N(R.sup.a)--C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.m, (31) --N(R.sup.a)--C(.dbd.O)--N(R.sup.b)--SO.sub.2--C.sub.0-6 alkyl-R.sup.m, (32) --C(.dbd.O)--C(.dbd.O)--N(R.sup.aR.sup.b), (33) --C(.dbd.O)--C.sub.1-6 alkyl-SO.sub.2R.sup.a, or (34) --C(.dbd.O)--C(.dbd.O)R.sup.m; carbocycle in R.sup.k is (i) a C.sub.3 to C.sub.8 monocyclic, saturated or unsaturated ring, (ii) a C.sub.7 to C.sub.12 bicyclic ring system, or (iii) a C.sub.11 to C.sub.16 tricyclic ring system, wherein each ring in (ii) or (iii) is independent of or fused to the other ring or rings and each ring is saturated or unsaturated; heterocycle in R.sup.k is (i) a 4- to 8-membered, saturated or unsaturated monocyclic ring, (ii) a 7- to 12-membered bicyclic ring system, or (iii) an 11 to 16-membered tricyclic ring system; wherein each ring in (ii) or (iii) is independent of or fused to the other ring or rings and each ring is saturated or unsaturated; the monocyclic ring, bicyclic ring system, or tricyclic ring system contains from 1 to 6 heteroatoms selected from N, O and S and a balance of carbon atoms; and wherein any one or more of the nitrogen and sulfur heteroatoms is optionally be oxidized, and any one or more of the nitrogen heteroatoms is optionally quaternized; each R.sup.m is independently C.sub.3-8 cycloalkyl; aryl; a 5- to 8-membered monocyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; or a 9- to 10-membered bicyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; wherein any one or more of the nitrogen and sulfur heteroatoms in the heterocycle or bicyclic heterocycle is optionally oxidized and any one or more of the nitrogen heteroatoms is optionally quaternized; and wherein the cycloalkyl or the aryl defined in R.sup.m is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl optionally substituted with --O--C.sub.1-4 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --N(R.sup.aR.sup.b), aryl, or --C.sub.1-6 alkyl-aryl; and the monocyclic or bicyclic heterocycle defined in R.sup.m is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, --C.sub.1-6 alkyl-aryl, --C(.dbd.O)-aryl, --CO.sub.2-aryl, --CO.sub.2--C.sub.1-6 alkyl-aryl, a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and each n is independently an integer equal to zero, 1 or 2; or a pharmaceutically acceptable salt thereof. 2. The compound according to claim 1, wherein R.sup.1 is: (1) --H, (2) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--C.sub.0-4 alkyl-N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--C.sub.0-4 alkyl-N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)--C(.dbd.O)R.sup.b, ##STR00289## --N(R.sup.a)C(.dbd.O)R.sup.k, or --N(R.sup.a)C(.dbd.O)C(.dbd.O)N(R.sup.bR.sup.b), (3) --R.sup.k, (4) --C.sub.1-4 alkyl-R.sup.k, wherein: (i) the alkyl is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --N(R.sup.a)C(.dbd.O)--C.sub.0-4 alkyl-N(R.sup.bR.sup.c), or --N(R.sup.a)--(CH.sub.2).sub.2-4--OH; and (ii) the alkyl is optionally mono-substituted with --R.sup.s, --N(R.sup.a)--C(.dbd.O)--C.sub.0-4 alkyl-R.sup.s, --N(R.sup.a)--C.sub.0-4 alkyl-R.sup.s, --O--C.sub.0-4 alkyl-R.sup.s, or --N(R.sup.a)--C(.dbd.O)--C.sub.0-4 alkyl-R.sup.s; wherein R.sup.s is (a) aryl which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, methylenedioxy attached to two adjacent carbon atoms, or phenyl; (b) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heteroaromatic ring is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, oxo, or phenyl; or (c) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C(.dbd.O)--C.sub.0-4 alkyl-N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, oxo, or phenyl, or (5) --(CH.sub.2).sub.0-3--C(.dbd.O)N(R.sup.a)--(CH.sub.2).sub.0-3--R.sub.k; or a pharmaceutically acceptable salt thereof. 3. The compound according to claim 2, wherein R.sup.1 is: (1) --H, (2) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --N(R.sup.aR.sup.b), or --C(.dbd.O)--(CH.sub.2).sub.0-2--N(R.sup.aR.sup.b), (3) --R.sup.k, (4) --(CH.sub.2).sub.1-4--R.sup.k, wherein: (i) the --(CH.sub.2).sub.1-4-moiety is optionally substituted with 1 or 2 substituents each of which is independently halogen, --OH, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --N(R.sup.aR.sup.b); and (ii) the --(CH.sub.2).sub.1-4-moiety is optionally mono-substituted with --R.sup.s or --N(R.sup.a)--(CH.sub.2).sub.1-2--R.sup.s; wherein R.sup.s is (a) phenyl which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, or --O--C.sub.1-4 haloalkyl; or (b) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heteroaromatic ring is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, or --O--C.sub.1-4 haloalkyl; or (c) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, or --CO.sub.2R.sup.a, (5) --C(.dbd.O)N(R.sup.a)--(CH.sub.2).sub.0-3--R.sup.k, (6) --C(CH.sub.3).sub.2N(R.sup.a)C(.dbd.O)R.sup.b, (7) --C(CH.sub.3).sub.2N(R.sup.a)C(.dbd.O)R.sup.k, or (8) --C(CH.sub.3).sub.2N(R.sup.a)C(.dbd.O)C(.dbd.O)N(R.sup.bR.sup.c); or a pharmaceutically acceptable salt thereof. 4. The compound according to claim 1, wherein R.sup.k is C.sub.3-8 cycloalkyl; aryl selected from phenyl and naphthyl; a bicyclic carbocycle selected from indanyl and tetrahydronaphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered saturated or unsaturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; wherein the cycloalkyl, aryl, bicyclic carbocycle, saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --C.sub.1-4 haloalkyl, (5) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently --OH, --CN, --O--C.sub.1-4 alkyl, --O--C.sub.1-4haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (6) --O--C.sub.1-4 haloalkyl (7) --O--C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (8) --N.sub.2, (9) oxo, (10) --C(.dbd.O)R.sup.a, (11) --CO.sub.2R.sup.a, (12) --SR.sup.a, (13) --S(.dbd.O)R.sup.a, (14) --N(R.sup.aR.sup.b), (15) --C(.dbd.O)N(R.sup.aR.sup.b), (16) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (17) --N(R.sup.a)C(.dbd.O)R.sup.b, (18) --SO.sub.2R.sup.a, (18) --SO.sub.2N(R.sup.aR.sup.b), (19) --N(R.sup.a)SO.sub.2R.sup.b, (20) --R.sup.m, (21) --C.sub.1-4 alkyl-R.sup.m, (22) --(CH.sub.2).sub.0-2--N(R.sup.a)--(CH.sub.2).sub.0-2--R.sup.m, (23) --(CH.sub.2).sub.0-2--O--(CH.sub.2).sub.0-2--R.sup.m, (24) --(CH.sub.2).sub.0-2--S--(CH.sub.2).sub.0-2--R.sup.m, (25) --(CH.sub.2).sub.0-2--C(.dbd.O)--(CH.sub.2).sub.0-2--R.sup.m, (26) --C(.dbd.O)--O--(CH.sub.2).sub.0-2--R.sup.m, (27) --C(.dbd.O)N(R.sup.a)--R.sup.m, or (28) --C(.dbd.O)--C(.dbd.O)N(R.sup.aR.sup.b); or a pharmaceutically acceptable salt thereof. 5. The compound according to claim 4, wherein each R.sup.m is independently C.sub.3-7 cycloalkyl; aryl selected from phenyl and naphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein any N is optionally oxidized to form an N-oxide; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered, saturated or unsaturated heterocyclic ring containing from 1 to 3 heteroatoms selected from N, O and S; wherein the cycloalkyl or the aryl defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --N(R.sup.aR.sup.b), phenyl, or --(CH.sub.2).sub.1-2-phenyl; the saturated heterocyclic ring defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, oxo, phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, --CO.sub.2--(CH.sub.2).sub.1-2-phenyl, a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and the heteroaromatic ring or the bicyclic heterocycle defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4alkyl, --O--C.sub.1-4 haloalkyl, oxo, phenyl, or --(CH.sub.2).sub.1-2-phenyl; or a pharmaceutically acceptable salt thereof. 6. The compound according to claim 4, wherein R.sup.k is phenyl; a 5- or 6-membered saturated heterocyclic ring containing 1 or 2 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; a 5- or 6-membered heteroaromatic ring containing 1 or 2 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered saturated heterocyclic ring containing 1 or 2 nitrogen atoms; wherein: (a) the phenyl, the saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally substituted with from 1 to 3 substituents each of which is independently (1) fluoro, (2) chloro, (3) bromo, (4) --OH (5) --CF.sub.3, (6) --C.sub.1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently --OH, --CN, --O--C.sub.1-4 alkyl, --OCF.sub.3, --N(R.sup.aR.sup.b), --C(.dbd.O)N(R.sup.aR.sup.b), or N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), (7) --OCF.sub.3, (8) --O--C.sub.1-4 alkyl (9) --C(.dbd.O)R.sup.a, (10) --CO.sub.2R.sup.a, (11) --SR.sup.a, (12) --S(.dbd.O)R.sup.a, (13) --N(R.sup.aR.sup.b), (14) --C(.dbd.O)N(R.sup.aR.sup.b), (15) --C(.dbd.O)--(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), (16) --N(R.sup.a)C(.dbd.O)R.sup.b, or (17) --SO.sub.2R.sup.a; (b) the phenyl is optionally mono-substituted with (1) --(CH.sub.2).sub.1-2--R.sup.m, or (2) --(CH.sub.2).sub.0-2--N(R.sup.a)--(CH.sub.2).sub.0-2--R.sup.m; and (c) the saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally mono- or di-substituted with (1) oxo (2) --(CH.sub.2).sub.1-2--R.sup.m, (3) --O--(CH.sub.2).sub.1-2--R.sup.m, or (4) --(CH.sub.2).sub.0-1--C(.dbd.O)--(CH.sub.2).sub.0-2--R.sup.m; or a pharmaceutically acceptable salt thereof. 7. The compound according to claim 6, wherein each R.sup.m is independently cyclopropyl; phenyl; a 5- or 6-membered saturated heterocyclic ring selected from pyrrolidinyl, imidazolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, and morpholinyl; or a 5- or 6-membered heteroaromatic ring selected from thienyl, pyridyl optionally in the form of an N-oxide, imidazolyl, pyrrolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, isooxazolyl, oxadiazolyl, thiadiazolyl, pyrazinyl, pyrimidinyl, triazolyl, tetrazolyl, furanyl, and pyridazinyl; wherein the cyclopropyl is unsubstituted; the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, or --N(R.sup.aR.sup.b); the saturated heterocyclic ring is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, oxo, phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, or --CO.sub.2--CH.sub.2-phenyl; and the heteroaromatic ring is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, oxo, phenyl, or --(CH.sub.2).sub.1-2-phenyl; or a pharmaceutically acceptable salt thereof. 8. The compound according to claim 1, wherein R.sup.2 is: (1) --C.sub.1-6 alkyl, (2) --C.sub.1-6 alkyl substituted with --N(R.sup.aR.sup.b), with the proviso that --N(R.sup.aR.sup.b) is not attached to the carbon atom in the --C.sub.1-6 alkyl group that is attached to the ring nitrogen, (3) --C.sub.1-6 alkyl substituted with phenyl, wherein the phenyl is: (a) optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --C.sub.0-4 alkyl-N(R.sup.aR.sup.b); and (b) optionally mono-substituted with --C.sub.1-4 alkyl substituted with a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-6 alkyl, oxo, or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atom, and 0 or 1 S atom; or (4) --C.sub.1-6 alkyl optionally substituted with --OH and substituted with a 5- or 6-membered saturated monocyclic heterocycle which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, or phenyl; or (5) --C.sub.1-6 alkyl substituted with a 5- or 6-membered heteroaromatic ring which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heteroaromatic ring is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, or phenyl; or a pharmaceutically acceptable salt thereof. 9. The compound according to claim 8, wherein R.sup.2 is methyl; or a pharmaceutically acceptable salt thereof. 10. The compound according to claim 1, wherein R.sup.3 is --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 11. The compound according to claim 10, wherein R.sup.3 is --H or methyl; or a pharmaceutically acceptable salt thereof. 12. The compound according to claim 11, wherein R.sup.3 is --H; or a pharmaceutically acceptable salt thereof. 13. The compound according to claim 1, wherein R.sup.4 is C.sub.1-4 alkyl substituted with an aryl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --CN, --NO.sub.2, --N(R.sup.aR.sup.b), --C.sub.1-14 alkyl-N(R.sup.aR.sup.b), --C(.dbd.O)N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C.sub.1-4 alkyl-CO.sub.2R.sup.a, --OCO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)C(.dbd.O)R.sup.b, --N(R.sup.a)CO.sub.2R.sup.b, --C.sub.1-4 alkyl-N(R.sup.a)CO.sub.2R.sup.b, methylenedioxy attached to two adjacent ring carbon atoms, phenyl, --C.sub.1-4 alkyl-phenyl, --O-phenyl, or --(CH.sub.2).sub.0-2-het; wherein het is a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, and het is optionally fused with a benzene ring, and is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --CO.sub.2R.sup.a; or a pharmaceutically acceptable salt thereof. 14. The compound according to claim 13, wherein R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; and each R.sup.aand R.sup.bis independently is H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 15. The compound according to claim 14, wherein R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents, each of which is independently --F, --Br, --Cl, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --SO.sub.2--C.sub.1-4 alkyl, --S--C.sub.1-4 alkyl, --N(CH.sub.3).sub.2, or --O--C.sub.1-4 fluoroalkyl; or a pharmaceutically acceptable salt thereof. 16. The compound according to claim 15, wherein R.sup.4 is p-fluorobenzyl or 2,3-dimethoxybenzyl; or a pharmaceutically acceptable salt thereof. 17. The compound according to claim 1, wherein: R.sup.1 is --R.sup.k; R.sup.k is phenyl which is (a) optionally substituted with from 1 to 3 substituents each of which is independently: (1) halogen, (2) --C.sub.1-6 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (3) --C.sub.1-6 haloalkyl, (4) --O--C.sub.1-6 haloalkyl, (5) --C(.dbd.O)R.sup.a, (6) --CO.sub.2R.sup.a, (7) --C(.dbd.O)N(R.sup.aR.sup.b), or (8) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b); and (b) optionally mono-substituted with (1) --C.sub.1-4 alkyl-R.sup.m, or (2) --C.sub.0-4 alkyl-N(R.sup.a)--C.sub.0-4 alkyl-R.sup.m; wherein R.sup.m is aryl selected from phenyl and naphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; wherein the aryl defined in R.sup.m is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, or --N(R.sup.aR.sup.b); the saturated heterocyclic ring defined in R.sup.m is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-4 alkyl or oxo, and is additionally optionally mono-substituted with phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, --CO.sub.2--(CH.sub.2).sub.1-2-phenyl, or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; and the heteroaromatic ring defined in R.sup.m is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl or oxo; or a pharmaceutically acceptable salt thereof. 18. The compound according to claim 17, wherein R.sup.2 is methyl; R.sup.3 is --H; R.sup.4 is: (1) --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; or (2) a fused bicyclic carbocycle selected from ##STR00290## wherein Z.sup.1 is --H or --OH; and each R.sup.aand R.sup.bis independently is H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 19. The compound according to claim 18, wherein R.sup.4 is 4-fluorobenzyl or 2,3-dimethoxybenzyl; or a pharmaceutically acceptable salt thereof. 20. The compound of Formula (II): ##STR00291## wherein Q is: (1) methyl which is optionally substituted with 1 or 2 of --O--C.sub.1-4 alkyl, (2) phenyl which is optionally substituted with from 1 to 3 substituents each of which is independently --F, --Cl, Br, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, methylenedioxy attached to two adjacent carbon atoms, or phenyl, or (3) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with 1 or 2 substituents each of which is independently --F, --Cl, --Br, --C.sub.1-4 alkyl, oxo, phenyl, or --C(.dbd.O)-phenyl; T is: (1) --H, (2) --OH, (3) methyl or ethyl, optionally substituted with --OH or --O--C.sub.1-4 alkyl, (4) --O--C.sub.1-4 alkyl (5) --N(R.sup.aR.sup.b), (6) --N(R.sup.a)--(CH.sub.2).sub.2--OH, (7) --N(R.sup.a)--CO.sub.2R.sup.b, (8) --N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), (9) --R.sup.s, (10) --(CH.sub.2).sub.1-2--R.sup.s, or (11) --(CH.sub.2).sub.0-2--N(R.sup.a)--(CH.sub.2).sub.0-3R.sup.s; R.sup.s is: (1) phenyl optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --N(R.sup.aR.sup.b); (2) a 5- or 6membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; which is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, oxo, phenyl, or --CH.sub.2-phenyl; or (3) a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; which is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or oxo; R.sup.2 is (1) --C.sub.1-4 alkyl, (2) --C.sub.1-4 alkyl substituted with --N(R.sup.aR.sup.b), with the proviso that --N(R.sup.aR.sup.b) is not attached to the carbon atom in the --C.sub.1-4 alkyl group that is attached to the ring nitrogen, or (3) --C.sub.1-4 alkyl substituted with a 5- or 6-membered saturated monocyclic heterocycle which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the saturated heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently a --C.sub.1-4 alkyl; R.sup.3 is --H or --C.sub.1-4 alkyl; R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; each R.sup.aand R.sup.bis independently --H or --C.sub.1-4 alkyl; and s is an integer equal to zero, 1, or 2; or a pharmaceutically acceptable salt thereof. 21. The compound according to claim 20, wherein Q is phenyl; T is: (1) --H, (2) --N(R.sup.aR.sup.b), (3) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; which is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl or --C(.dbd.O)R.sup.a, or (4) --N(R.sup.a)--(CH.sub.2).sub.1-2-heteroaromatic, wherein the heteroaromatic is a 5- or 6-membered ring containing 1 or 2 N atoms; R.sup.2 is methyl; R.sup.3 is --H; and R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with 1 or 2 substituents each of which is independently --F, --Cl, --Br, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --SO.sub.2CH.sub.3, --SCH.sub.3, --N(CH.sub.3).sub.2 or --OCF.sub.3; each R.sup.aand R.sup.bis independently --H, methyl or ethyl; and s is an integer equal to zero or 1; or a pharmaceutically acceptable salt thereof. 22. The compound according to claim 1, wherein R.sup.1 is --R.sup.k; R.sup.k is (i) a 5- or 6-membered saturated heterocyclic ring containing from 0 to 1 oxygen atoms and from 1 to 3 nitrogen atoms or (ii) a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered saturated heterocyclic ring containing from 0 to 1 oxygen atoms and from 1 to 3 nitrogen atoms; wherein the saturated heterocyclic ring or bicyclic heterocycle is optionally substituted with from 1 to 3 substituents each of which is independently (1) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --O--C.sub.1-4 alkyl, --O--C.sub.1-14 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (2) --OH, (3) --C(.dbd.O)R.sup.a, (4) --CO.sub.2R.sup.a, (5) --C(.dbd.O)N(R.sup.aR.sup.b), (6) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (7) --SR.sup.a, (8) --S(.dbd.O)R.sup.a, (9) --SO.sub.2R.sup.a, (10) --N(R.sup.aR.sup.b), (11) --R.sup.m, (12) --C.sub.1-4 alkyl-R.sup.m, wherein the alkyl is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --OH, --CN, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (13) --C.sub.0-4 alkyl-N(R.sup.a)--C.sub.0-4 alkyl-R.sup.m, (14) --C.sub.0-4 alkyl-O--C.sub.0-4 alkyl-R.sup.m, (15) --C.sub.0-4 alkyl-S--C.sub.0-4 alkyl-R.sup.m, (16) --C.sub.0-4 alkyl-C(.dbd.O)--C.sub.0-4 alkyl-R.sup.m, (17) --C(.dbd.O)--O--C.sub.0-4 alkyl-R.sup.m, or (18) --C(.dbd.O)N(R.sup.a)--C.sub.0-4 alkyl-R.sup.m; wherein each R.sup.m is independently --C.sub.3-6 cycloalkyl; aryl selected from phenyl and naphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S, wherein any N is optionally oxidized to form an N-oxide; wherein the aryl is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, or --N(R.sup.aR.sup.b); the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-4 alkyl or oxo, and is additionally optionally mono-substituted with phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, or --CO.sub.2--(CH.sub.2).sub.1-2-phenyl; and the heteroaromatic ring is optionally substituted with 1 or 2 substituents each of which is independently halogen, --C.sub.1-4 alkyl, or oxo; or a pharmaceutically acceptable salt thereof. 23. The compound according to claim 22, wherein R.sup.1 is: ##STR00292## R.sup.8 is: (1) --H, (2) --C.sub.1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently --OH, --O--C.sub.1-4 allyl, --OCF.sub.3, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --N(R.sup.aR.sup.b), or --C(.dbd.O)N(R.sup.aR.sup.b), (3) --C(.dbd.O)R.sup.a, (4) --CO.sub.2R.sup.a, (5) --C(.dbd.O)N(R.sup.aR.sup.b), (6) --C(.dbd.O)--(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), (7) --SO.sub.2R.sup.a, (8) --(CH.sub.2).sub.1-2--R.sup.m, (9) --(CH.sub.2).sub.0-2--C(.dbd.O)--(CH.sub.2).sub.0-2--R.sup.m, (10) --C(.dbd.O)--O--(CH.sub.2).sub.0-2--R.sup.m, or (11) --C(.dbd.O)N(R.sup.a)--(CH.sub.2).sub.0-2--R.sup.m; R.sup.10 is --H, --OH, --C.sub.1-4 alkyl, --O--C.sub.1-4 alkyl, --N(R.sup.aR.sup.b), or --O--(CH.sub.2).sub.1-2--R.sup.m; R.sup.12 is (1) --H, (2) --C.sub.1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently --OH, --O--C.sub.1-4 alkyl, --OCF.sub.3, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --N(R.sup.aR.sup.b), or --C(.dbd.O)N(R.sup.aR.sup.b), (3) --C(.dbd.O)R.sup.a, (4) --CO.sub.2R.sup.a, (5) --C(.dbd.O)--(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), or (6) --SO.sub.2R.sup.a; R.sup.2 is methyl; R.sup.3 is --H or methyl; R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; and each R.sup.aand R.sup.bis independently --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 24. The compound according to claim 1, which is a compound of Formula (III): ##STR00293## wherein R.sup.2 is: (1) --C.sub.1-6 alkyl, (2) --C.sub.1-6 alkyl substituted with --N(R.sup.aR.sup.b), with the proviso that --N(R.sup.aR.sup.b) is not attached to the carbon atom in the --C.sub.1-6 alkyl group that is attached to the ring nitrogen, (3) --C.sub.1-6 alkyl substituted with phenyl which is: (a) optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --C.sub.0-6 alkyl-N(R.sup.aR.sup.b); and (b) optionally mono-substituted with --C.sub.1-4 alkyl substituted with a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-6 alkyl, oxo, or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atom, and 0 or 1 S atom; (4) --C.sub.1-6 alkyl optionally substituted with --OH and substituted with a 5- or 6-membered saturated monocyclic heterocycle which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, or phenyl; or (5) --C.sub.1-6 alkyl substituted with a 5- or 6-membered heteroaromatic ring which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 of 1 S atoms; wherein the heteroaromatic ring is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, or phenyl; or a pharmaceutically acceptable salt thereof. 25. The compound according to claim 24, wherein R.sup.2 is: (1) --C.sub.1-4 alkyl, (2) --(CH.sub.2).sub.1-3--N(R.sup.aR.sup.b), (3) --(CH.sub.2).sub.1-3-phenyl, wherein the phenyl is: (a) optionally substituted with from 1 to 3 substituents each of which is independently fluoro, chloro, bromo, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --O--CF.sub.3, or --(CH.sub.2).sub.1-3--N(R.sup.aR.sup.b); and (b) optionally mono-substituted with --(CH.sub.2).sub.1-3-saturated heterocycle which is a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms, wherein the heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-4 alkyl or pyridyl; (4) --(CH.sub.2).sub.1-3-saturated heterocycle, wherein the --(CH.sub.2).sub.1-3-moiety is optionally substituted with an --OH and the saturated heterocycle is a 5- or 6-membered saturated monocyclic heterocycle which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocycle is optionally substituted with from 1 to 3 substituents each of which is independently a --C.sub.1-4 alkyl; or (5) --(CH.sub.2).sub.1-3-pyridyl; R.sup.3 is --H or methyl; R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; and each R.sup.aand R.sup.bis independently --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 26. The compound according to claim 1, wherein R.sup.1 is --C(.dbd.O)NH--(CH.sub.2).sub.1-2--R.sup.k; and R.sup.k is (i) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S, or (ii) a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; or a pharmaceutically acceptable salt thereof. 27. The compound according to claim 26, wherein R.sup.2 is methyl; R.sup.3 is --H or methyl; R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; and each R.sup.aand R.sup.bis independently --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 28. A compound according to claim 1, which is a compound selected from the group consisting of N-(2-ethoxybenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydr- opyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-d- ihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-2-{4-[(dimethylamino)methyl]phenyl}-5-hydroxy-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-2-{4-[(dimethylamino)methyl]phenyl}-5-hydroxy-1-methyl- -6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(pyrrolidin-1-ylmet- hyl)phenyl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(pyrrolidin-1-ylmethyl)p- henyl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(piperidin-1-ylmethyl)ph- enyl]-1,6-dihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-2-[4-(morpholin-4-ylmethyl)phe- nyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[4-(morpholin-4-ylmethyl)phenyl]-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{4-[(4-methylpiperazin-1-yl)methy- l]phenyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{4-[(diethylainino)methyl]phenyl}-N-(2,3-dimethoxybenzyl)-5-hydroxy-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{4-[(diethylamino)methyl]phenyl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(dimethylamino)(phenyl)methyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6- -oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-2-[(4-formylpiperazin-1-yl)(phenyl)methyl]-5-hydroxy-1- -methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-{phenyl[(pyridin-3-ylmethyl- )amino]methyl}-1,6-dihydropyrimidine-4-carboxamide; 2-benzyl-1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; 1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-2-(2-methylphenyl- )-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydr- opyrimidine-4-carboxamide; 2-benzyl-N-(2,3-dimethoxybenzyl)-1-[2-(dimethylamino)ethyl]-5-hydroxy-6-o- xo-1,6-dihydropyrimidine-4-carboxamide; 2-{4-[(4-ethylpiperazin-1-yl)methyl]phenyl}-N-(4-fluorobenzyl)-5-hydroxy-- 1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-{4-[(2-pyridin-3-ylpiperidi- n-1-yl)methyl]phenyl}-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carbo- xamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimi- dine-4-carboxamide; N-[4-fluoro-2-(trifluoromethyl)benzyl]-5-hydroxy-1-methyl-6-oxo-1,6-dihyd- ropyrimidine-4-carboxamide; N-(3-chloro-4-methylbenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin- e-4-carboxamide; 5-hydroxy-N-[(1R,2S)-2-hydroxy-2,3-dihydro-1H-inden-1-yl]-1-methyl-2-{4-[- (4-methylpiperazin-1-yl)methyl]phenyl}-6-oxo-1,6-dihydropyrimidine-4-carbo- xamide; N-(4-fluorobenzyl)-5-hydroxy-2-(4-{[(2R)-2-(methoxymethyl)pyrrolid- in-1-yl]methyl}phenyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-(4-{[(2S)-2-(methoxymethyl)pyrrolidin-1-yl- ]methyl}phenyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-2-(4-{[(4-fluorobenzyl)amino]methyl}phenyl)-5-hydroxy-- 1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-1-(2-morpholin-4ylethyl)-6-oxo-1,6-- dihydropyrimidine-4-carboxamide; 1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,6-dihydro- pyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(pyridin-3-ylmethyl)-1,6-dihydropyri- midine-4-carboxamide; 2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(2-pyrrolidin-1-ylethyl)-1,- 6-dihydropyrimidine-4-carboxamide; 2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(2-piperidin-1-ylethyl)-1,6- -dihydropyrimidine-4-carboxamide; 2-(1-benzylpiperidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methylpiperidin-2-yl)-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; 2-(1-benzylpiperidin-3-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; 1-{3-[(dimethylamino)methyl]benzyl}-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-1-[2-(dimethylamino)ethyl]-5-hydroxy-6-oxo-1,6-di- hydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-6-oxo-1-(pyridin-3-ylmethyl)-1,6-dihydr- opyrimidine-4-carboxamide; N4-(4-fluorobenzyl)-5-hydroxy-1 methyl-N-2-(2-morpholin-4-ylethyl)-6-oxo-1,6-dihydropyrimidine-2,4-dicarb- oxamide; N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-[3-(pyrrolidin-1-ylmethyl)be- nzyl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-[3-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6- -dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-{3-[(4-methylpiperazin-1-yl)methyl]benzyl}- -6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-{3-[(4-pyridin-2-ylpiperazin-1-yl)me- thyl]benzyl}-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-[2-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6- -dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-{2-[(4-pyridin-2-ylpiperazin-1-yl)me- thyl]benzyl}-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-pyrrolidin-2-yl-1,6-dihydro- pyrimidine-4-carboxamide; N4-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-N-2-(pyridin-2-ylmethyl)-1,6- -dihydropyrimidine-2,4-dicarboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-(2-hydroxy-3-morpholin-4-ylpropyl)-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-[4-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6- -dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(2-morpholin-4-ylethyl)-6-oxo-1,6- -dihydropyrimidine-4-carboxamide; 2-(2,2-dimethoxyethyl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-di- hydropyrimidine-4-carboxamide; 2-(2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo- -1,6-dihydropyrimidine-4-carboxamide; 2-[2-(4-benzoylpiperazin-1-yl)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methy- l-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(N,N-dimethylglycyl)piperidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-2,3-dihydro-1H-indol-2-- yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-(1,2,3,4-tetrahydroquinolin- -2-yl)-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1,2,3,4-tetrahydroquino- lin-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide; tert-butyl (2S,4R)-4-(benzyloxy)-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-- methyl-6-oxo-1,6-dihydropyrimidin-2-yl)pyrrolidine-1-carboxylate; tert-butyl (2S,4R)-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1- ,6-dihydropyrimidin-2-yl)-4-hydroxypyrrolidine-1-carboxylate; 2-[(2S,4R)-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-4-hydroxypyrrolidin-2-yl]-1-methy- l-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R).sub.4-hydroxy-1-methylpyrrolidin-- 2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-4-(benzyloxy)-1-methylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-1-benzoyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-h- ydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(N,N-dimethylglycyl)-2,3-dihydro-1H-indol-2-yl]-N-(4-fluorobenzyl)-5- -hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-benzoyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-me- thyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)-2- ,3-dihydro-1H-indol-2-yl]-1,6-dihydropyrimidine-4-carboxamide; tert-butyl 3-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihyd- ropyrimidin-2-yl)-4-methylpiperazine-1-carboxylate; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; (+)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-ox- o-1,6-dihydropyrimidine-4-carboxamide (-)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-ox- o-1,6-dihydropyrimidine-4-carboxamide 2-(1-ethyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-meth- yl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(6-benzoylpiperidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)pi- peridin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(2-methyl-1,2,3,4-tetrahydroisoqu- inolin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-benzoylpyrrolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-- 1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)py- rrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methylpyrrolidin-2-yl)-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-4-(benzyloxy)-1-(pyridin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fl- uorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(dimethylamino)-2-phenylethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl- -6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-1-benzoyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydro- xy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-(1-isobutyl-2,3-dihydro-1H-indol-2-yl)-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-(1-isopropyl-2,3-dihydro-1H-indol-2-yl)-1-- methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(N,N-dimethylglycyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-- methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{1-[(6-bromopyridin-2-yl)carbonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5- -hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methylpiperazin-2-yl)-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; 2-(1-benzoyl(methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)-1- ,2,3,4-tetrahydroquinolin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; 2-[1-(cyclopropylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1- -methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[1-(methylsulfonyl)pyrrolidin-2-y- l]-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(4-methylmorpholin-3-yl)carbo- nyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1,4-dimethylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-ox- o-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-3-ylcarbonyl)py- rrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-1-acetyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-(1-isonicotinoylpyrrolidin-2-yl)-1-methyl-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{1-[(ethylamino)carbonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-- 1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(1-methyl-1H-imidazol-2-yl)ca- rbonyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-1-acetyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydrox- y-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(anilinocarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-met- hyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(4-ethyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(1-oxidopyridin-2-yl)carbonyl- ]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrazin-2-ylcarbonyl)py- rrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; 2-[(4R)-3-acetyl-1,3-thiazolidin-4-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-met- hyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[1-methyl-4-(methylsulfonyl)piper- azin-2-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylthiomorpholin-3-yl)-6-ox- o-1,6-dihydropyrimidine-4-carboxamide; N-[4-fluoro-2-(methylsulfonyl)benzyl]-5-hydroxy-1-methyl-6-oxo-2-[1-(pyra- zin-2-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-N-[4-fluoro-2-(methylsulfonyl)benzyl]-5-hydro- xy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(3-acetyl-1,3-thiazolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6- -oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(acetylamino)-1-methylethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6- -oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-N-(2-ethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; 2-(4-acetyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl- -6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[1-methyl-4-(pyrazin-2-ylcarbonyl- )piperazin-2-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-5-hydroxy-1-methyl-N-[2-(methylthio)benzyl]-6- -oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-{1-[(1H-imidazol-5-ylcarbonyl)amino]-1-met- hylethyl}-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-benzoyl-4-(pyrazin-2-ylcarbonyl)piperazin-2-yl]-N-(4-fluorobenzyl)-5- -hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(4-benzoyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methy- l-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[4 enzyloxy)-1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-h- ydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-- oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-5-hydroxy-N-(2-methoxybenzyl)-1-methyl-6-oxo-- 1,6-dihydropyrimidine-4-carboxamide; N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-d- ihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide; 2-(1-acetylpyrrolidin-2-yl)-N-[2-(dimethylamino)benzyl]-5-hydroxy-1-methy- l-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-1-acetylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-- oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[4-hydroxy-1-(pyrazin-2-ylcarbonyl)pyrroli- din-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-di- hydropyrimidin-2-yl)-1-methylethyl]imidazo[2,1-b][1,3]thiazole-6-carboxami- de; 2-[(2S,4S)-1-acetyl-4-fluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydr- oxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-methyl-4-[(1-methyl-1H-imidazo- l-2-yl)carbonyl]piperazin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl 1-{[(5-methyl-1,3,4-oxadiazol-2-yl)carbonyl]amino}ethyl)-6-oxo-1,6-dihydr- opyrimidine-4-carboxamide; N1-{1-[4-({[4-fluoro-2-(methylsulfonyl)benzyl]amino}carbonyl)-5-hydroxy-1- -methyl-6-oxo-1,6-dihydropyrimidin-2-yl]-1-methylethyl}-N2,N2-dimethyletha- nediamide; 2-(4-acetyl-1,2-dimethylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrimidin-4-ylcarbonyl)- pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrimidin-5-ylcarbonyl)- pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-methyl-1-[(1H-pyrazol-5-ylcarb- onyl)amino]ethyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2R,4R)-1-acetyl-4-methoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydrox- y-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-{1-[4-({[4-fluoro-2-(methylsulfonyl)benzyl]amino}carbonyl)-5-hydroxy-1-- methyl-6-oxo-1,6-dihydropyrimidin-2-yl]-1-methylethyl}imidazo[2,1-b][1,3]t- hiazole-6-carboxamide; 2-[(2R,4R)-1-benzoyl-4-methoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydro- xy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[4-(isopropylsulfonyl)-1-methylpiperazin-2- -yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1,2-dimethyl-4-(methylsulfonyl)piperazin-2-yl]-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-4-methoxy-1-methylpyrrolidin-2-yl- ]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(methylsulfonyl)acetyl]pyrrol- idin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-1-acetyl-4,4-difluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydrox- y-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2R,4R)-1-acetyl-4-ethoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy- -1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-4,4-difluoro-1-methylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydrox- y-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridazin-3-ylcarb- onyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1-{[morpholin-4-yl(oxo)- acetyl]amino}ethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2R,4R)-1-[(dimethylamino)(oxo)acetyl]-4-methoxypyrrolidin-2-yl}-N-(4-- fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide- ; 2-[(2S)-4,4-difluoro-1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluor- obenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{(2S,4S)-1-methyl-4-[(methylsulfo- nyl)amino]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{1-[(dimethylamino)sulfonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydro- xy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2R,4R)-4-ethoxy-1-[(methylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-flu- orobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-4,4-difluoro-1-(pyridazin-3-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluo- robenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-4,4-difluoro-1-(pyridin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluoro- benzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2S)-1-[(dimethylamino)(oxo)acetyl]-4,4-difluoropyrrolidin-2-yl}-N-(4-- fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide- ; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[morpholin-4-yl(oxo)acetyl]py- rrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2S)-1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)- -5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2S)-1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluoro-2-meth- oxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-d- ihydropyrimidin-2-yl)-1-methylethyl]-N1,N2,N2-trimethylethanediamide; 2-[(2S)-1-acetylpyrrolidin-2-yl]-N-(4-fluoro-2-methoxybenzyl)-5-hydroxy-1- -methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-2-[(2S,4S)-4-fluoro-1-methylpyrrolidin-2-yl]-5-hydroxy- -1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2S,4S)-1-[(dimethylamino)(oxo)acetyl]-4-fluoropyrrolidin-2-yl}-N-(4-f- luorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N1-[1-(4-{[(3-chloro-4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-- oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide; and pharmaceutically acceptable salts thereof. 29. A pharmaceutical composition comprising a therapeutically effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 30. A pharmaceutical composition which comprises the product prepared by combining an effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 31. A compound according to claim 28, which is a compound selected from the group consisting of: N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-d- ihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1-{[(5-methyl-1,3,4-oxa- diazol-2-yl)carbonyl]amino}ethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamid- e; and pharmaceutically acceptable salts thereof. 32. A compound according to claim 31, which is N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-d- ihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide or a pharmaceutically acceptable salt thereof. 33. A pharmaceutical composition comprising a therapeutically effective amount of a compound according to claim 32, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 34. A compound according to claim 31, which is N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1-{[(5-methyl-1,3,4-oxa- diazol-2-yl)carbonyl]amino}ethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamid- e or a pharmaceutically acceptable salt thereof. 35. A pharmaceutical composition comprising a therapeutically effective amount of a compound according to claim 34, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 36. A compound of Formula (I): ##STR00294## wherein R.sup.1 is (1) --H, (2) --C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)--C(.dbd.O)R.sup.b, or ##STR00295## (3) --R.sup.k, (4) --C.sub.1-6 alkyl-R.sup.k, wherein: (i) the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --N(R.sup.a)C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.bR.sup.c), or --N(R.sup.a)--C.sub.2-6 alkyl-OH with the proviso that the --OH is not attached to the carbon alpha to N(R.sup.a); and (ii) the alkyl is optionally mono-substituted with --R.sup.s, --C.sub.1-6 alkyl-R.sup.s, --N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-R.sup.s, --N(R.sup.a)--C.sub.0-6 alkyl-R.sup.s, --O--C.sub.0-6 alkyl-R.sup.s, or --N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-R.sup.s; wherein R.sup.s is (a) aryl which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --C.sub.1-6 alkyl, --C.sub.1-6 alky-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, methylenedioxy attached to two adjacent carbon atoms, or aryl; (b) a 4- to 8- membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-16 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, oxo, aryl, or --C.sub.1-6 alkyl-aryl; or (c) a 5- to 7-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heteroaromatic ring is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, or aryl; (5) --C.sub.0-6 alkyl-O--C.sub.0-6 alkyl-R.sup.k, (6) --C.sub.0-6 alkyl-S(O).sub.n--C.sub.0-6 alkyl-R.sup.k, (7) --O--C.sub.1-16 alkyl-OR.sup.k, (8) --O--C.sub.1-16 alkyl-O--C.sub.1-6 alkyl-R.sup.k, (9) --O--C.sub.1-6 alkyl-S(O).sub.nR.sup.k, (10) --C.sub.0-6 alkyl-N(R.sup.a)--R.sup.k, (11) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.1-6 alkyl-R.sup.k, (12) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.1-6 alkyl-OR.sup.k, (13) --C.sub.0-6 alkyl-C(.dbd.O)--R.sup.k, (14) --C.sub.0-6 alkyl-C(.dbd.O)N(R.sup.a)--C.sub.0-6 alkyl-R.sup.k, (15) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)--C.sub.0-6 alkyl-R.sup.k, or (16) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.k; R.sup.2 is --C.sub.1-6 alkyl which is optionally substituted with one or more substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --O--C.sub.1-6 alkyl, (5) --O--C.sub.1-6 haloalkyl, (6) --C(.dbd.O)R.sup.a, (7) --CO.sub.2R.sup.a, (8) --SR.sup.a, (9) --S(.dbd.O)R.sup.a, (10) --N(R.sup.aR.sup.b), (11) --C(.dbd.O)N(R.sup.aR.sup.b), (12) --N(R.sup.a)--C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.bR.sup.c), (13) --SO.sub.2R.sup.a, (14) --N(R.sup.a)SO.sub.2R.sup.b, (15) --SO.sub.2N(R.sup.aR.sup.b), (16) --N(R.sup.a)--C(R.sup.b).dbd.O, (17) --C.sub.3-8 cycloalkyl, (18) aryl, wherein the aryl is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C.sub.0-6 alkyl-N(R.sup.aR.sup.b), or --C.sub.1-6 alkyl substituted with a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-6 alkyl, oxo, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; or (19) a 5- to 8-membered monocyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heterocycle is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, phenyl, or naphthyl; R.sup.3 is --H or --C.sub.1-6 alkyl; R.sup.4 is (1) H, (2) C.sub.1-6 alkyl which is substituted with one or more substituents each of which is independently halogen, --OH, O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --NO.sub.2, --N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, or --N(R.sup.a)CO.sub.2R.sup.b, (3) C.sub.1-6 alkyl which is optionally substituted with one or more substituents each of which is independently halogen, --OH, or O--C.sub.1-4 alkyl, and which is substituted with 1 or 2 substituents each of which is independently: (i) C.sub.3-8 cycloalkyl, (ii) aryl, (iii) a fused bicyclic carbocycle consisting of a benzene ring fused to a C.sub.5-7 cycloalkyl, (iv) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, (v) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or (vi) a 9- or 10-membered fused bicyclic heterocycle containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein at least one of the rings is aromatic, (4) C.sub.2-5 alkynyl optionally substituted with aryl, (5) C.sub.3-8 cycloalkyl optionally substituted with aryl, (6) aryl, (7) a fused bicyclic carbocycle consisting of a benzene ring fused to a C.sub.5-7 cycloalkyl, (8) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, (9) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or (10) a 9- or 10-membered fused bicyclic heterocycle containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein at least one of the rings is aromatic; wherein each aryl in (3)(ii) or the aryl (4), (5) or (6) or each fused carbocycle in (3)(iii) or the fused carbocycle in (7) is optionally substituted with one or more substituents each of which is independently halogen, --OH, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --CN, --NO.sub.2, --N(R.sup.aR.sup.b), --C.sub.1-6 alkyl-N(R.sup.aR.sup.b), --C(.dbd.O)N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C.sub.1-6 alkyl-CO.sub.2R.sup.a, --OCO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)C(.dbd.O)R.sup.b, --N(R.sup.a)CO.sub.2R.sup.b, --C.sub.1-6 alkyl-N(R.sup.a) CO.sub.2R.sup.b, aryl, --C.sub.1-6 alkyl-aryl, --O-aryl, or --C.sub.0-6 alkyl-het wherein het is a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, and het is optionally fused with a benzene ring, and is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, or --CO.sub.2R.sup.a; each saturated heterocyclic ring in (3)(iv) or the saturated heterocyclic ring in (8) is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and each heteroaromatic ring in (3)(v) or the heteroaromatic ring in (9) or each fused bicyclic heterocycle in (3)(vi) or the fused bicyclic heterocycle in (10) is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, or --C.sub.1-6 alkyl-aryl; or alternatively R.sup.3 and R.sup.4 together with the N to which both are attached form a C.sub.3-7 azacycloalkyl which is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl or oxo; each R.sup.a, R.sup.b, R.sup.c, and R.sup.d is independently --H or --C.sub.1-6 alkyl; R.sup.k is carbocycle or heterocycle, wherein the carbocycle or heterocycle is optionally substituted with one or more substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (5) --O--C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (6) --NO.sub.2, (7) oxo, (8) --C(.dbd.O)R.sup.a, (9) --CO.sub.2R.sup.a, (10) --SR.sup.a, (11) --S(.dbd.O)R.sup.a, (12) --N(R.sup.aR.sup.b), (13) --C(.dbd.O)N(R.sup.aR.sup.b), (14) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (15) --N(R.sup.a)C(.dbd.O)R.sup.b, (16) --SO.sub.2R.sup.a, (17) --SO.sub.2N(R.sup.aR.sup.b), (18) --N(R.sup.a)SO.sub.2R.sup.b, (19) --R.sup.m, (20) --C.sub.1-6 alkyl-R.sup.m, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (21) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.0-6 alkyl-R.sup.m, (22) --C.sub.0-6 alkyl-O--C.sub.0-6 alkyl-R.sup.m, (23) --C.sub.0-6 alkyl-S--C.sub.0-6 alkyl-R.sup.m, (24) --C.sub.0-6 alkyl-C(.dbd.O)--C.sub.0-6 alkyl-R.sup.m, (25) --C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.m, (26) --C(.dbd.O)N(R.sup.a)--C.sub.0-6 alkyl-R.sup.m, (27) --N(R.sup.a)C(.dbd.O)--R.sup.m, (28) --N(R.sup.a)C(.dbd.O)--C.sub.1-6 alkyl-R.sup.m, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (29) --N(R.sup.a)--C(.dbd.O)--N(R.sup.b)--C.sub.0-6 alkyl-R.sup.m, (30) --N(R.sup.a)--C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.m, (31) --N(R.sup.a)--C(.dbd.O)--N(R.sup.b)--SO.sub.2--C.sub.0-6 alkyl-R.sup.m; carbocycle in R.sup.k is (i) a C.sub.3 to C.sub.8 monocyclic, saturated or unsaturated ring, (ii) a C.sub.7 to C.sub.12 bicyclic ring system, or (iii) a C.sub.11 to C.sub.16 tricyclic ring system, wherein each ring in (ii) or (iii) is independent of or fused to the other ring or rings and each ring is saturated or unsaturated; heterocycle in R.sup.k is (i) a 4- to 8-membered, saturated or unsaturated monocyclic ring, (ii) a 7- to 12-membered bicyclic ring system, or (iii) an 11 to 16-membered tricyclic ring system; wherein each ring in (ii) or (iii) is independent of or fused to the other ring or rings and each ring is saturated or unsaturated; the monocyclic ring, bicyclic ring system, or tricyclic ring system contains from 1 to 6 heteroatoms selected from N, O and S and a balance of carbon atoms; and wherein any one or more of the nitrogen and sulfur heteroatoms is optionally be oxidized, and any one or more of the nitrogen heteroatoms is optionally quaternized; each R.sup.m is independently C.sub.3-8 cycloalkyl; aryl; a 5- to 8-membered monocyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; or a 9- to 10-membered bicyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; wherein any one or more of the nitrogen and sulfur heteroatoms in the heterocycle or bicyclic heterocycle is optionally oxidized and any one or more of the nitrogen heteroatoms is optionally quatemized; and wherein the cycloalkyl or the aryl defined in R.sup.m is optionally substituted with one or more sub stituents each of which is independently halogen, --C.sub.1-6 alkyl optionally substituted with --O--C.sub.1-4 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --N(R.sup.aR.sup.b), aryl, or --C.sub.1-6 alkyl-aryl; and the monocyclic or bicyclic heterocycle defined in R.sup.m is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, --C.sub.1-6 alkyl-aryl, --C(.dbd.O)-aryl, --CO.sub.2-aryl, --CO.sub.2--C.sub.1-6 alkyl-aryl, a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and each n is independently an integer equal to zero, 1 or 2; or a pharmaceutically acceptable salt thereof. 37. The compound according to claim 36, wherein R.sup.k is C.sub.3-8 cycloalkyl; aryl selected from phenyl and naphthyl; a bicyclic carbocycle selected from indanyl and tetrahydronaphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered saturated or unsaturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; wherein the cycloalkyl, aryl, bicyclic carbocycle, saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --C.sub.1-4 haloalkyl, (5) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently --OH, --CN, --O--C.sub.1-4 alkyl, --O--C.sub.1-4haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (6) --O--C.sub.1-4 haloalkyl (7)--O--C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (8) --N.sub.2, (9) oxo, (10) --C(.dbd.O)R.sup.a, (11) --CO.sub.2R.sup.a, (12) --SR.sup.a, (13) --S(.dbd.O)R.sup.a, (14) --N(R.sup.aR.sup.b), (15) --C(.dbd.O)N(R.sup.aR.sup.b), (16) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (17) --N(R.sup.a)C(.dbd.O)R.sup.b, (18) --SO.sub.2R.sup.a, (18) --SO.sub.2N(R.sup.aR.sup.b), (19) --N(R.sup.a)SO.sub.2R.sup.b, (20) --R.sup.m, (21) --C.sub.1-4 alkyl-R.sup.m, (22) --(CH.sub.2).sub.0-2--N(R.sup.a)--(CH.sub.2).sub.0-2--R.sup.m, (23) --(CH.sub.2).sub.0-2--O--(CH.sub.2).sub.0-2--R.sup.m, (24) --(CH.sub.2).sub.0-2--S--(CH.sub.2).sub.0-2--R.sup.m, (25) --(CH.sub.2).sub.0-2--C(.dbd.O)--(CH.sub.2).sub.0-2--R.sup.m, (26) --C(.dbd.O)--O--(CH.sub.2).sub.0-2--R.sup.m, or (27) --C(.dbd.O)N(R.sup.a)--R.sup.m; or a pharmaceutically acceptable salt thereof. 38. The compound according to claim 37, wherein each R.sup.m is independently C.sub.3-7 cycloalkyl; aryl selected from phenyl and naphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein any N is optionally oxidized to form an N-oxide; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered, saturated or unsaturated heterocyclic ring containing from 1 to 3 heteroatoms selected from N, O and S; wherein the cycloalkyl or the aryl defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --N(R.sup.aR.sup.b), phenyl, or --(CH.sub.2).sub.1-2-phenyl; the saturated heterocyclic ring defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-4 alkyl optionally substituted with --O--C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, oxo, phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, --CO.sub.2--(CH.sub.2).sub.1-2-phenyl, a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and the heteroaromatic ring or the bicyclic heterocycle defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, oxo, phenyl, or --(CH.sub.2).sub.1-2-phenyl; or a pharmaceutically acceptable salt thereof. 39. The compound according to claim 36, wherein R.sup.2 is methyl; or a pharmaceutically acceptable salt thereof. 40. The compound according to claim 36, wherein R.sup.3 is --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 41. The compound according to claim 40, wherein R.sup.3 is --H or methyl; or a pharmaceutically acceptable salt thereof. 42. The compound according to claim 41, wherein R.sup.3 is --H; or a pharmaceutically acceptable salt thereof. 43. The compound according to claim 36, wherein R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, or phenyl; and each R.sup.a and R.sup.b is independently is H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 44. The compound according to claim 43, wherein R.sup.4 is p-fluorobenzyl or 2,3-dimethoxybenzyl; or a pharmaceutically acceptable salt thereof. 1. A compound of Formula (I): ##STR00287## wherein R.sup.1 is (1) --H, (2) --C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)--C(.dbd.O)R.sup.b, ##STR00288## or --N(R.sup.a)C(.dbd.O)C(.dbd.O)N(R.sup.aR.sup.b), (3) --R.sup.k, (4) --C.sub.1-6 alkyl-R.sup.k, wherein: (i) the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --N(R.sup.a)C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.bR.sup.c), or --N(R.sup.a)--C.sub.2-6 alkyl-OH with the proviso that the --OH is not attached to the carbon alpha to N(R.sup.a); and (ii) the alkyl is optionally mono-substituted with --R.sup.s, --C.sub.1-6 alkyl-R.sup.s, --N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-R.sup.s, --N(R.sup.a)--C.sub.0-6 alkyl-R.sup.s, --O--C.sub.0-6 alkyl-R.sup.S, or --N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-R.sup.s; wherein R.sup.s is (a) aryl which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, methylenedioxy attached to two adjacent carbon atoms, or aryl; (b) a 4- to 8-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-16 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, oxo, aryl, or --C.sub.1-6 alkyl-aryl; or (c) a 5- to 7-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heteroaromatic ring is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, or aryl; (5) --C.sub.0-6 alkyl-O--C.sub.0-6 alkyl-R.sup.k, (6) --C.sub.0-6 alkyl-S(O).sub.n--C.sub.0-6 alkyl-R.sup.k, (7) --O--C.sub.1-16 alkyl-OR.sup.k, (8) --O--C.sub.1-16 alkyl-O--C.sub.1-6 alkyl-R.sup.k, (9) --O--C.sub.1-6 alkyl-S(O).sub.nR.sup.k, (10) --C.sub.0-6 alkyl-N(R.sup.a)--R.sup.k, (11) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.1-6 alkyl-R.sup.k, (12) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.1-6 alkyl-OR.sup.k, (13) --C.sub.0-6 alkyl-C(.dbd.O)--R.sup.k, (14) --C.sub.0-6 alkyl-C(.dbd.O)N(R.sup.a)--C.sub.0-6 alkyl-R.sup.k, (15) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)--C.sub.0-6 alkyl-R.sup.k, (16) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.k, or (17) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)C(.dbd.O)R.sup.k; R.sup.2 is --C.sub.1-6 alkyl which is optionally substituted with one or more substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --O--C.sub.1-6 alkyl, (5) --O--C.sub.1-6 haloalkyl, (6) --C(.dbd.O)R.sup.a, (7) --CO.sub.2R.sup.a, (8) --SR.sup.a, (9) --S(.dbd.O)R.sup.a, (10) --N(R.sup.aR.sup.b), (11) --C(.dbd.O)N(R.sup.aR.sup.b), (12) --N(R.sup.a)--C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.bR.sup.c), (13) --SO.sub.2R.sup.a, (14) --N(R.sup.a)SO.sub.2R.sup.b, (15) --SO.sub.2N(R.sup.aR.sup.b), (16) --N(R.sup.a)--C(R.sup.b).dbd.O, (17) --C.sub.3-8 cycloalkyl, (18) aryl, wherein the aryl is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C.sub.0-6 alkyl-N(R.sup.aR.sup.b), or --C.sub.1-6 alkyl substituted with a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-6 alkyl, oxo, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; or (19) a 5- to 8-membered monocyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heterocycle is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, phenyl, or naphthyl; with the proviso that none of the following substituents is attached to the carbon atom in the --C.sub.1-6 alkyl group that is attached to the ring nitrogen: halogen, --OH, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O; R.sup.3 is --H or --C.sub.1-6 alkyl; R.sup.4 is (1) C.sub.1-6 alkyl which is substituted with one or more substituents each of which is independently halogen, --OH, O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --NO.sub.2, --N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, or --N(R.sup.a)CO.sub.2R.sup.b, (2) C.sub.1-6 alkyl which is optionally substituted with one or more substituents each of which is independently halogen, --OH, or O--C.sub.1-4 alkyl, and which is substituted with 1 or 2 substituents each of which is independently: (i) C.sub.3-8 cycloalkyl, (ii) aryl, (iii) a fused bicyclic carbocycle consisting of a benzene ring fused to a C.sub.5-7 cycloalkyl, (iv) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, (v) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or (vi) a 9- or 10-membered fused bicyclic heterocycle containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein at least one of the rings is aromatic, (3) C.sub.2-5 alkynyl optionally substituted with aryl, (4) C.sub.3-8 cycloalkyl optionally substituted with aryl, (5) aryl, (6) a fused bicyclic carbocycle consisting of a benzene ring fused to a C.sub.5-7 cycloalkyl, (7) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, (8) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or (9) a 9- or 10-membered fused bicyclic heterocycle containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein at least one of the rings is aromatic; wherein each aryl in (2)(ii) or the aryl (3), (4) or (5) or each fused carbocycle in (2)(iii) or the fused carbocycle in (6) is optionally substituted with one or more substituents each of which is independently halogen, --OH, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --CN, --NO.sub.2, --N(R.sup.aR.sup.b), --C.sub.1-6 alkyl-N(R.sup.aR.sup.b), --C(.dbd.O)N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C.sub.1-6 alkyl-CO.sub.2R.sup.a, --OCO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)C(.dbd.O)R.sup.b, --N(R.sup.a)CO.sub.2R.sup.b, --C.sub.1-6 alkyl-N(R.sup.a)CO.sub.2R.sup.b, aryl, --C.sub.1-6 alkyl-aryl, --O-aryl, or --C.sub.0-6 alkyl-het wherein het is a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, and het is optionally fused with a benzene ring, and is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, or --CO.sub.2R.sup.a; each saturated heterocyclic ring in (2)(iv) or the saturated heterocyclic ring in (7) is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and each heteroaromatic ring in (2)(v) or the heteroaromatic ring in (8) or each fused bicyclic heterocycle in (2)(vi) or the fused bicyclic heterocycle in (9) is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, or --C.sub.1-6 alkyl-aryl; or alternatively R.sup.3 and R.sup.4 together with the N to which both are attached form a C.sub.3-7 azacycloalkyl which is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl or oxo; each R.sup.a, R.sup.b, R.sup.c, and R.sup.d is independently --H or --C.sub.1-6 alkyl; R.sup.k is carbocycle or heterocycle, wherein the carbocycle or heterocycle is optionally substituted with one or more substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (5) --O--C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (6) --NO.sub.2, (7) oxo, (8) --C(.dbd.O)R.sup.a, (9) --CO.sub.2R.sup.a, (10) --SR.sup.a, (11) --S(.dbd.O)R.sup.a, (12) --N(R.sup.aR.sup.b), (13) --C(.dbd.O)N(R.sup.aR.sup.b), (14) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (15) --N(R.sup.a)C(.dbd.O)R.sup.b, (16) --SO.sub.2R.sup.a, (17) --SO.sub.2N(R.sup.aR.sup.b), (18) --N(R.sup.a)SO.sub.2R.sup.b, (19) --R.sup.m, (20) --C.sub.1-6 alkyl-R.sup.m, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (21) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.0-6 alkyl-R.sup.m, (22) --C.sub.0-6 alkyl-O--C.sub.0-6 alkyl-R.sup.m, (23) --C.sub.0-6 alkyl-S--C.sub.0-6 alkyl-R.sup.m, (24) --C.sub.0-6 alkyl-C(.dbd.O)--C.sub.0-6 alkyl-R.sup.m, (25) --C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.m, (26) --C(.dbd.O)N(R.sup.a)--C.sub.0-6 alkyl-R.sup.m, (27) --N(R.sup.a)C(.dbd.O)--R.sup.m, (28) --N(R.sup.a)C(.dbd.O)--C.sub.1-6 alkyl-R.sup.m, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (29) --N(R.sup.a)--C(.dbd.O)--N(R.sup.b)--C.sub.0-6 alkyl-R.sup.m, (30) --N(R.sup.a)--C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.m, (31) --N(R.sup.a)--C(.dbd.O)--N(R.sup.b)--SO.sub.2--C.sub.0-6 alkyl-R.sup.m, (32) --C(.dbd.O)--C(.dbd.O)--N(R.sup.aR.sup.b), (33) --C(.dbd.O)--C.sub.1-6 alkyl-SO.sub.2R.sup.a, or (34) --C(.dbd.O)--C(.dbd.O)R.sup.m; carbocycle in R.sup.k is (i) a C.sub.3 to C.sub.8 monocyclic, saturated or unsaturated ring, (ii) a C.sub.7 to C.sub.12 bicyclic ring system, or (iii) a C.sub.11 to C.sub.16 tricyclic ring system, wherein each ring in (ii) or (iii) is independent of or fused to the other ring or rings and each ring is saturated or unsaturated; heterocycle in R.sup.k is (i) a 4- to 8-membered, saturated or unsaturated monocyclic ring, (ii) a 7- to 12-membered bicyclic ring system, or (iii) an 11 to 16-membered tricyclic ring system; wherein each ring in (ii) or (iii) is independent of or fused to the other ring or rings and each ring is saturated or unsaturated; the monocyclic ring, bicyclic ring system, or tricyclic ring system contains from 1 to 6 heteroatoms selected from N, O and S and a balance of carbon atoms; and wherein any one or more of the nitrogen and sulfur heteroatoms is optionally be oxidized, and any one or more of the nitrogen heteroatoms is optionally quaternized; each R.sup.m is independently C.sub.3-8 cycloalkyl; aryl; a 5- to 8-membered monocyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; or a 9- to 10-membered bicyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; wherein any one or more of the nitrogen and sulfur heteroatoms in the heterocycle or bicyclic heterocycle is optionally oxidized and any one or more of the nitrogen heteroatoms is optionally quaternized; and wherein the cycloalkyl or the aryl defined in R.sup.m is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl optionally substituted with --O--C.sub.1-4 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --N(R.sup.aR.sup.b), aryl, or --C.sub.1-6 alkyl-aryl; and the monocyclic or bicyclic heterocycle defined in R.sup.m is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, --C.sub.1-6 alkyl-aryl, --C(.dbd.O)-aryl, --CO.sub.2-aryl, --CO.sub.2--C.sub.1-6 alkyl-aryl, a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and each n is independently an integer equal to zero, 1 or 2; or a pharmaceutically acceptable salt thereof. 2. The compound according to claim 1, wherein R.sup.1 is: (1) --H, (2) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--C.sub.0-4 alkyl-N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--C.sub.0-4 alkyl-N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)--C(.dbd.O)R.sup.b, ##STR00289## --N(R.sup.a)C(.dbd.O)R.sup.k, or --N(R.sup.a)C(.dbd.O)C(.dbd.O)N(R.sup.bR.sup.b), (3) --R.sup.k, (4) --C.sub.1-4 alkyl-R.sup.k, wherein: (i) the alkyl is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --N(R.sup.a)C(.dbd.O)--C.sub.0-4 alkyl-N(R.sup.bR.sup.c), or --N(R.sup.a)--(CH.sub.2).sub.2-4--OH; and (ii) the alkyl is optionally mono-substituted with --R.sup.s, --N(R.sup.a)--C(.dbd.O)--C.sub.0-4 alkyl-R.sup.s, --N(R.sup.a)--C.sub.0-4 alkyl-R.sup.s, --O--C.sub.0-4 alkyl-R.sup.s, or --N(R.sup.a)--C(.dbd.O)--C.sub.0-4 alkyl-R.sup.s; wherein R.sup.s is (a) aryl which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, methylenedioxy attached to two adjacent carbon atoms, or phenyl; (b) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heteroaromatic ring is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, oxo, or phenyl; or (c) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C(.dbd.O)--C.sub.0-4 alkyl-N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, oxo, or phenyl, or (5) --(CH.sub.2).sub.0-3--C(.dbd.O)N(R.sup.a)--(CH.sub.2).sub.0-3--R.sub.k; or a pharmaceutically acceptable salt thereof. 3. The compound according to claim 2, wherein R.sup.1 is: (1) --H, (2) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --N(R.sup.aR.sup.b), or --C(.dbd.O)--(CH.sub.2).sub.0-2--N(R.sup.aR.sup.b), (3) --R.sup.k, (4) --(CH.sub.2).sub.1-4--R.sup.k, wherein: (i) the --(CH.sub.2).sub.1-4-moiety is optionally substituted with 1 or 2 substituents each of which is independently halogen, --OH, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --N(R.sup.aR.sup.b); and (ii) the --(CH.sub.2).sub.1-4-moiety is optionally mono-substituted with --R.sup.s or --N(R.sup.a)--(CH.sub.2).sub.1-2--R.sup.s; wherein R.sup.s is (a) phenyl which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, or --O--C.sub.1-4 haloalkyl; or (b) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heteroaromatic ring is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, or --O--C.sub.1-4 haloalkyl; or (c) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, or --CO.sub.2R.sup.a, (5) --C(.dbd.O)N(R.sup.a)--(CH.sub.2).sub.0-3--R.sup.k, (6) --C(CH.sub.3).sub.2N(R.sup.a)C(.dbd.O)R.sup.b, (7) --C(CH.sub.3).sub.2N(R.sup.a)C(.dbd.O)R.sup.k, or (8) --C(CH.sub.3).sub.2N(R.sup.a)C(.dbd.O)C(.dbd.O)N(R.sup.bR.sup.c); or a pharmaceutically acceptable salt thereof. 4. The compound according to claim 1, wherein R.sup.k is C.sub.3-8 cycloalkyl; aryl selected from phenyl and naphthyl; a bicyclic carbocycle selected from indanyl and tetrahydronaphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered saturated or unsaturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; wherein the cycloalkyl, aryl, bicyclic carbocycle, saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --C.sub.1-4 haloalkyl, (5) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently --OH, --CN, --O--C.sub.1-4 alkyl, --O--C.sub.1-4haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (6) --O--C.sub.1-4 haloalkyl (7) --O--C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (8) --N.sub.2, (9) oxo, (10) --C(.dbd.O)R.sup.a, (11) --CO.sub.2R.sup.a, (12) --SR.sup.a, (13) --S(.dbd.O)R.sup.a, (14) --N(R.sup.aR.sup.b), (15) --C(.dbd.O)N(R.sup.aR.sup.b), (16) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (17) --N(R.sup.a)C(.dbd.O)R.sup.b, (18) --SO.sub.2R.sup.a, (18) --SO.sub.2N(R.sup.aR.sup.b), (19) --N(R.sup.a)SO.sub.2R.sup.b, (20) --R.sup.m, (21) --C.sub.1-4 alkyl-R.sup.m, (22) --(CH.sub.2).sub.0-2--N(R.sup.a)--(CH.sub.2).sub.0-2--R.sup.m, (23) --(CH.sub.2).sub.0-2--O--(CH.sub.2).sub.0-2--R.sup.m, (24) --(CH.sub.2).sub.0-2--S--(CH.sub.2).sub.0-2--R.sup.m, (25) --(CH.sub.2).sub.0-2--C(.dbd.O)--(CH.sub.2).sub.0-2--R.sup.m, (26) --C(.dbd.O)--O--(CH.sub.2).sub.0-2--R.sup.m, (27) --C(.dbd.O)N(R.sup.a)--R.sup.m, or (28) --C(.dbd.O)--C(.dbd.O)N(R.sup.aR.sup.b); or a pharmaceutically acceptable salt thereof. 5. The compound according to claim 4, wherein each R.sup.m is independently C.sub.3-7 cycloalkyl; aryl selected from phenyl and naphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein any N is optionally oxidized to form an N-oxide; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered, saturated or unsaturated heterocyclic ring containing from 1 to 3 heteroatoms selected from N, O and S; wherein the cycloalkyl or the aryl defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --N(R.sup.aR.sup.b), phenyl, or --(CH.sub.2).sub.1-2-phenyl; the saturated heterocyclic ring defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, oxo, phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, --CO.sub.2--(CH.sub.2).sub.1-2-phenyl, a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and the heteroaromatic ring or the bicyclic heterocycle defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4alkyl, --O--C.sub.1-4 haloalkyl, oxo, phenyl, or --(CH.sub.2).sub.1-2-phenyl; or a pharmaceutically acceptable salt thereof. 6. The compound according to claim 4, wherein R.sup.k is phenyl; a 5- or 6-membered saturated heterocyclic ring containing 1 or 2 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; a 5- or 6-membered heteroaromatic ring containing 1 or 2 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered saturated heterocyclic ring containing 1 or 2 nitrogen atoms; wherein: (a) the phenyl, the saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally substituted with from 1 to 3 substituents each of which is independently (1) fluoro, (2) chloro, (3) bromo, (4) --OH (5) --CF.sub.3, (6) --C.sub.1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently --OH, --CN, --O--C.sub.1-4 alkyl, --OCF.sub.3, --N(R.sup.aR.sup.b), --C(.dbd.O)N(R.sup.aR.sup.b), or N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), (7) --OCF.sub.3, (8) --O--C.sub.1-4 alkyl (9) --C(.dbd.O)R.sup.a, (10) --CO.sub.2R.sup.a, (11) --SR.sup.a, (12) --S(.dbd.O)R.sup.a, (13) --N(R.sup.aR.sup.b), (14) --C(.dbd.O)N(R.sup.aR.sup.b), (15) --C(.dbd.O)--(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), (16) --N(R.sup.a)C(.dbd.O)R.sup.b, or (17) --SO.sub.2R.sup.a; (b) the phenyl is optionally mono-substituted with (1) --(CH.sub.2).sub.1-2--R.sup.m, or (2) --(CH.sub.2).sub.0-2--N(R.sup.a)--(CH.sub.2).sub.0-2--R.sup.m; and (c) the saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally mono- or di-substituted with (1) oxo (2) --(CH.sub.2).sub.1-2--R.sup.m, (3) --O--(CH.sub.2).sub.1-2--R.sup.m, or (4) --(CH.sub.2).sub.0-1--C(.dbd.O)--(CH.sub.2).sub.0-2--R.sup.m; or a pharmaceutically acceptable salt thereof. 7. The compound according to claim 6, wherein each R.sup.m is independently cyclopropyl; phenyl; a 5- or 6-membered saturated heterocyclic ring selected from pyrrolidinyl, imidazolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, and morpholinyl; or a 5- or 6-membered heteroaromatic ring selected from thienyl, pyridyl optionally in the form of an N-oxide, imidazolyl, pyrrolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, isooxazolyl, oxadiazolyl, thiadiazolyl, pyrazinyl, pyrimidinyl, triazolyl, tetrazolyl, furanyl, and pyridazinyl; wherein the cyclopropyl is unsubstituted; the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, or --N(R.sup.aR.sup.b); the saturated heterocyclic ring is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, oxo, phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, or --CO.sub.2--CH.sub.2-phenyl; and the heteroaromatic ring is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, oxo, phenyl, or --(CH.sub.2).sub.1-2-phenyl; or a pharmaceutically acceptable salt thereof. 8. The compound according to claim 1, wherein R.sup.2 is: (1) --C.sub.1-6 alkyl, (2) --C.sub.1-6 alkyl substituted with --N(R.sup.aR.sup.b), with the proviso that --N(R.sup.aR.sup.b) is not attached to the carbon atom in the --C.sub.1-6 alkyl group that is attached to the ring nitrogen, (3) --C.sub.1-6 alkyl substituted with phenyl, wherein the phenyl is: (a) optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --C.sub.0-4 alkyl-N(R.sup.aR.sup.b); and (b) optionally mono-substituted with --C.sub.1-4 alkyl substituted with a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-6 alkyl, oxo, or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atom, and 0 or 1 S atom; or (4) --C.sub.1-6 alkyl optionally substituted with --OH and substituted with a 5- or 6-membered saturated monocyclic heterocycle which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, or phenyl; or (5) --C.sub.1-6 alkyl substituted with a 5- or 6-membered heteroaromatic ring which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heteroaromatic ring is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, or phenyl; or a pharmaceutically acceptable salt thereof. 9. The compound according to claim 8, wherein R.sup.2 is methyl; or a pharmaceutically acceptable salt thereof. 10. The compound according to claim 1, wherein R.sup.3 is --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 11. The compound according to claim 10, wherein R.sup.3 is --H or methyl; or a pharmaceutically acceptable salt thereof. 12. The compound according to claim 11, wherein R.sup.3 is --H; or a pharmaceutically acceptable salt thereof. 13. The compound according to claim 1, wherein R.sup.4 is C.sub.1-4 alkyl substituted with an aryl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --CN, --NO.sub.2, --N(R.sup.aR.sup.b), --C.sub.1-14 alkyl-N(R.sup.aR.sup.b), --C(.dbd.O)N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C.sub.1-4 alkyl-CO.sub.2R.sup.a, --OCO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)C(.dbd.O)R.sup.b, --N(R.sup.a)CO.sub.2R.sup.b, --C.sub.1-4 alkyl-N(R.sup.a)CO.sub.2R.sup.b, methylenedioxy attached to two adjacent ring carbon atoms, phenyl, --C.sub.1-4 alkyl-phenyl, --O-phenyl, or --(CH.sub.2).sub.0-2-het; wherein het is a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, and het is optionally fused with a benzene ring, and is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --CO.sub.2R.sup.a; or a pharmaceutically acceptable salt thereof. 14. The compound according to claim 13, wherein R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; and each R.sup.aand R.sup.bis independently is H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 15. The compound according to claim 14, wherein R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents, each of which is independently --F, --Br, --Cl, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --SO.sub.2--C.sub.1-4 alkyl, --S--C.sub.1-4 alkyl, --N(CH.sub.3).sub.2, or --O--C.sub.1-4 fluoroalkyl; or a pharmaceutically acceptable salt thereof. 16. The compound according to claim 15, wherein R.sup.4 is p-fluorobenzyl or 2,3-dimethoxybenzyl; or a pharmaceutically acceptable salt thereof. 17. The compound according to claim 1, wherein: R.sup.1 is --R.sup.k; R.sup.k is phenyl which is (a) optionally substituted with from 1 to 3 substituents each of which is independently: (1) halogen, (2) --C.sub.1-6 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (3) --C.sub.1-6 haloalkyl, (4) --O--C.sub.1-6 haloalkyl, (5) --C(.dbd.O)R.sup.a, (6) --CO.sub.2R.sup.a, (7) --C(.dbd.O)N(R.sup.aR.sup.b), or (8) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b); and (b) optionally mono-substituted with (1) --C.sub.1-4 alkyl-R.sup.m, or (2) --C.sub.0-4 alkyl-N(R.sup.a)--C.sub.0-4 alkyl-R.sup.m; wherein R.sup.m is aryl selected from phenyl and naphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; wherein the aryl defined in R.sup.m is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, or --N(R.sup.aR.sup.b); the saturated heterocyclic ring defined in R.sup.m is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-4 alkyl or oxo, and is additionally optionally mono-substituted with phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, --CO.sub.2--(CH.sub.2).sub.1-2-phenyl, or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; and the heteroaromatic ring defined in R.sup.m is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl or oxo; or a pharmaceutically acceptable salt thereof. 18. The compound according to claim 17, wherein R.sup.2 is methyl; R.sup.3 is --H; R.sup.4 is: (1) --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; or (2) a fused bicyclic carbocycle selected from ##STR00290## wherein Z.sup.1 is --H or --OH; and each R.sup.aand R.sup.bis independently is H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 19. The compound according to claim 18, wherein R.sup.4 is 4-fluorobenzyl or 2,3-dimethoxybenzyl; or a pharmaceutically acceptable salt thereof. 20. The compound of Formula (II): ##STR00291## wherein Q is: (1) methyl which is optionally substituted with 1 or 2 of --O--C.sub.1-4 alkyl, (2) phenyl which is optionally substituted with from 1 to 3 substituents each of which is independently --F, --Cl, Br, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, methylenedioxy attached to two adjacent carbon atoms, or phenyl, or (3) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with 1 or 2 substituents each of which is independently --F, --Cl, --Br, --C.sub.1-4 alkyl, oxo, phenyl, or --C(.dbd.O)-phenyl; T is: (1) --H, (2) --OH, (3) methyl or ethyl, optionally substituted with --OH or --O--C.sub.1-4 alkyl, (4) --O--C.sub.1-4 alkyl (5) --N(R.sup.aR.sup.b), (6) --N(R.sup.a)--(CH.sub.2).sub.2--OH, (7) --N(R.sup.a)--CO.sub.2R.sup.b, (8) --N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), (9) --R.sup.s, (10) --(CH.sub.2).sub.1-2--R.sup.s, or (11) --(CH.sub.2).sub.0-2--N(R.sup.a)--(CH.sub.2).sub.0-3R.sup.s; R.sup.s is: (1) phenyl optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --N(R.sup.aR.sup.b); (2) a 5- or 6membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; which is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, oxo, phenyl, or --CH.sub.2-phenyl; or (3) a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; which is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-4 alkyl, --C.sub.1-4 alkyl-OR.sup.a, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or oxo; R.sup.2 is (1) --C.sub.1-4 alkyl, (2) --C.sub.1-4 alkyl substituted with --N(R.sup.aR.sup.b), with the proviso that --N(R.sup.aR.sup.b) is not attached to the carbon atom in the --C.sub.1-4 alkyl group that is attached to the ring nitrogen, or (3) --C.sub.1-4 alkyl substituted with a 5- or 6-membered saturated monocyclic heterocycle which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the saturated heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently a --C.sub.1-4 alkyl; R.sup.3 is --H or --C.sub.1-4 alkyl; R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; each R.sup.aand R.sup.bis independently --H or --C.sub.1-4 alkyl; and s is an integer equal to zero, 1, or 2; or a pharmaceutically acceptable salt thereof. 21. The compound according to claim 20, wherein Q is phenyl; T is: (1) --H, (2) --N(R.sup.aR.sup.b), (3) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; which is optionally substituted with 1 or 2 substituents each of which is independently --C.sub.1-4 alkyl or --C(.dbd.O)R.sup.a, or (4) --N(R.sup.a)--(CH.sub.2).sub.1-2-heteroaromatic, wherein the heteroaromatic is a 5- or 6-membered ring containing 1 or 2 N atoms; R.sup.2 is methyl; R.sup.3 is --H; and R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with 1 or 2 substituents each of which is independently --F, --Cl, --Br, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --SO.sub.2CH.sub.3, --SCH.sub.3, --N(CH.sub.3).sub.2 or --OCF.sub.3; each R.sup.aand R.sup.bis independently --H, methyl or ethyl; and s is an integer equal to zero or 1; or a pharmaceutically acceptable salt thereof. 22. The compound according to claim 1, wherein R.sup.1 is --R.sup.k; R.sup.k is (i) a 5- or 6-membered saturated heterocyclic ring containing from 0 to 1 oxygen atoms and from 1 to 3 nitrogen atoms or (ii) a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered saturated heterocyclic ring containing from 0 to 1 oxygen atoms and from 1 to 3 nitrogen atoms; wherein the saturated heterocyclic ring or bicyclic heterocycle is optionally substituted with from 1 to 3 substituents each of which is independently (1) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --O--C.sub.1-4 alkyl, --O--C.sub.1-14 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (2) --OH, (3) --C(.dbd.O)R.sup.a, (4) --CO.sub.2R.sup.a, (5) --C(.dbd.O)N(R.sup.aR.sup.b), (6) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (7) --SR.sup.a, (8) --S(.dbd.O)R.sup.a, (9) --SO.sub.2R.sup.a, (10) --N(R.sup.aR.sup.b), (11) --R.sup.m, (12) --C.sub.1-4 alkyl-R.sup.m, wherein the alkyl is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --OH, --CN, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (13) --C.sub.0-4 alkyl-N(R.sup.a)--C.sub.0-4 alkyl-R.sup.m, (14) --C.sub.0-4 alkyl-O--C.sub.0-4 alkyl-R.sup.m, (15) --C.sub.0-4 alkyl-S--C.sub.0-4 alkyl-R.sup.m, (16) --C.sub.0-4 alkyl-C(.dbd.O)--C.sub.0-4 alkyl-R.sup.m, (17) --C(.dbd.O)--O--C.sub.0-4 alkyl-R.sup.m, or (18) --C(.dbd.O)N(R.sup.a)--C.sub.0-4 alkyl-R.sup.m; wherein each R.sup.m is independently --C.sub.3-6 cycloalkyl; aryl selected from phenyl and naphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S, wherein any N is optionally oxidized to form an N-oxide; wherein the aryl is optionally substituted with from 1 to 3 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --OCF.sub.3, or --N(R.sup.aR.sup.b); the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-4 alkyl or oxo, and is additionally optionally mono-substituted with phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, or --CO.sub.2--(CH.sub.2).sub.1-2-phenyl; and the heteroaromatic ring is optionally substituted with 1 or 2 substituents each of which is independently halogen, --C.sub.1-4 alkyl, or oxo; or a pharmaceutically acceptable salt thereof. 23. The compound according to claim 22, wherein R.sup.1 is: ##STR00292## R.sup.8 is: (1) --H, (2) --C.sub.1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently --OH, --O--C.sub.1-4 allyl, --OCF.sub.3, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --N(R.sup.aR.sup.b), or --C(.dbd.O)N(R.sup.aR.sup.b), (3) --C(.dbd.O)R.sup.a, (4) --CO.sub.2R.sup.a, (5) --C(.dbd.O)N(R.sup.aR.sup.b), (6) --C(.dbd.O)--(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), (7) --SO.sub.2R.sup.a, (8) --(CH.sub.2).sub.1-2--R.sup.m, (9) --(CH.sub.2).sub.0-2--C(.dbd.O)--(CH.sub.2).sub.0-2--R.sup.m, (10) --C(.dbd.O)--O--(CH.sub.2).sub.0-2--R.sup.m, or (11) --C(.dbd.O)N(R.sup.a)--(CH.sub.2).sub.0-2--R.sup.m; R.sup.10 is --H, --OH, --C.sub.1-4 alkyl, --O--C.sub.1-4 alkyl, --N(R.sup.aR.sup.b), or --O--(CH.sub.2).sub.1-2--R.sup.m; R.sup.12 is (1) --H, (2) --C.sub.1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently --OH, --O--C.sub.1-4 alkyl, --OCF.sub.3, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --N(R.sup.aR.sup.b), or --C(.dbd.O)N(R.sup.aR.sup.b), (3) --C(.dbd.O)R.sup.a, (4) --CO.sub.2R.sup.a, (5) --C(.dbd.O)--(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), or (6) --SO.sub.2R.sup.a; R.sup.2 is methyl; R.sup.3 is --H or methyl; R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; and each R.sup.aand R.sup.bis independently --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 24. The compound according to claim 1, which is a compound of Formula (III): ##STR00293## wherein R.sup.2 is: (1) --C.sub.1-6 alkyl, (2) --C.sub.1-6 alkyl substituted with --N(R.sup.aR.sup.b), with the proviso that --N(R.sup.aR.sup.b) is not attached to the carbon atom in the --C.sub.1-6 alkyl group that is attached to the ring nitrogen, (3) --C.sub.1-6 alkyl substituted with phenyl which is: (a) optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, or --C.sub.0-6 alkyl-N(R.sup.aR.sup.b); and (b) optionally mono-substituted with --C.sub.1-4 alkyl substituted with a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-6 alkyl, oxo, or a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atom, and 0 or 1 S atom; (4) --C.sub.1-6 alkyl optionally substituted with --OH and substituted with a 5- or 6-membered saturated monocyclic heterocycle which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, or phenyl; or (5) --C.sub.1-6 alkyl substituted with a 5- or 6-membered heteroaromatic ring which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 of 1 S atoms; wherein the heteroaromatic ring is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, or phenyl; or a pharmaceutically acceptable salt thereof. 25. The compound according to claim 24, wherein R.sup.2 is: (1) --C.sub.1-4 alkyl, (2) --(CH.sub.2).sub.1-3--N(R.sup.aR.sup.b), (3) --(CH.sub.2).sub.1-3-phenyl, wherein the phenyl is: (a) optionally substituted with from 1 to 3 substituents each of which is independently fluoro, chloro, bromo, --C.sub.1-4 alkyl, --CF.sub.3, --O--C.sub.1-4 alkyl, --O--CF.sub.3, or --(CH.sub.2).sub.1-3--N(R.sup.aR.sup.b); and (b) optionally mono-substituted with --(CH.sub.2).sub.1-3-saturated heterocycle which is a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms selected from 1 or 2 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms, wherein the heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-4 alkyl or pyridyl; (4) --(CH.sub.2).sub.1-3-saturated heterocycle, wherein the --(CH.sub.2).sub.1-3-moiety is optionally substituted with an --OH and the saturated heterocycle is a 5- or 6-membered saturated monocyclic heterocycle which contains from 1 to 3 heteroatoms selected from 1 to 3 N atoms, 0 or 1 O atoms, and 0 or 1 S atoms; wherein the heterocycle is optionally substituted with from 1 to 3 substituents each of which is independently a --C.sub.1-4 alkyl; or (5) --(CH.sub.2).sub.1-3-pyridyl; R.sup.3 is --H or methyl; R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; and each R.sup.aand R.sup.bis independently --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 26. The compound according to claim 1, wherein R.sup.1 is --C(.dbd.O)NH--(CH.sub.2).sub.1-2--R.sup.k; and R.sup.k is (i) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S, or (ii) a 5- or 6-membered heteroaromatic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; or a pharmaceutically acceptable salt thereof. 27. The compound according to claim 26, wherein R.sup.2 is methyl; R.sup.3 is --H or methyl; R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, --SR.sup.a, --N(R.sup.aR.sup.b) or phenyl; and each R.sup.aand R.sup.bis independently --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 28. A compound according to claim 1, which is a compound selected from the group consisting of N-(2-ethoxybenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydr- opyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-d- ihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-2-{4-[(dimethylamino)methyl]phenyl}-5-hydroxy-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-2-{4-[(dimethylamino)methyl]phenyl}-5-hydroxy-1-methyl- -6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(pyrrolidin-1-ylmet- hyl)phenyl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(pyrrolidin-1-ylmethyl)p- henyl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(piperidin-1-ylmethyl)ph- enyl]-1,6-dihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-2-[4-(morpholin-4-ylmethyl)phe- nyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[4-(morpholin-4-ylmethyl)phenyl]-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{4-[(4-methylpiperazin-1-yl)methy- l]phenyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{4-[(diethylainino)methyl]phenyl}-N-(2,3-dimethoxybenzyl)-5-hydroxy-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{4-[(diethylamino)methyl]phenyl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(dimethylamino)(phenyl)methyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6- -oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-2-[(4-formylpiperazin-1-yl)(phenyl)methyl]-5-hydroxy-1- -methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-{phenyl[(pyridin-3-ylmethyl- )amino]methyl}-1,6-dihydropyrimidine-4-carboxamide; 2-benzyl-1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; 1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-2-(2-methylphenyl- )-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydr- opyrimidine-4-carboxamide; 2-benzyl-N-(2,3-dimethoxybenzyl)-1-[2-(dimethylamino)ethyl]-5-hydroxy-6-o- xo-1,6-dihydropyrimidine-4-carboxamide; 2-{4-[(4-ethylpiperazin-1-yl)methyl]phenyl}-N-(4-fluorobenzyl)-5-hydroxy-- 1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-{4-[(2-pyridin-3-ylpiperidi- n-1-yl)methyl]phenyl}-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carbo- xamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimi- dine-4-carboxamide; N-[4-fluoro-2-(trifluoromethyl)benzyl]-5-hydroxy-1-methyl-6-oxo-1,6-dihyd- ropyrimidine-4-carboxamide; N-(3-chloro-4-methylbenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin- e-4-carboxamide; 5-hydroxy-N-[(1R,2S)-2-hydroxy-2,3-dihydro-1H-inden-1-yl]-1-methyl-2-{4-[- (4-methylpiperazin-1-yl)methyl]phenyl}-6-oxo-1,6-dihydropyrimidine-4-carbo- xamide; N-(4-fluorobenzyl)-5-hydroxy-2-(4-{[(2R)-2-(methoxymethyl)pyrrolid- in-1-yl]methyl}phenyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-(4-{[(2S)-2-(methoxymethyl)pyrrolidin-1-yl- ]methyl}phenyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-2-(4-{[(4-fluorobenzyl)amino]methyl}phenyl)-5-hydroxy-- 1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-1-(2-morpholin-4ylethyl)-6-oxo-1,6-- dihydropyrimidine-4-carboxamide; 1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,6-dihydro- pyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(pyridin-3-ylmethyl)-1,6-dihydropyri- midine-4-carboxamide; 2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(2-pyrrolidin-1-ylethyl)-1,- 6-dihydropyrimidine-4-carboxamide; 2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(2-piperidin-1-ylethyl)-1,6- -dihydropyrimidine-4-carboxamide; 2-(1-benzylpiperidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methylpiperidin-2-yl)-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; 2-(1-benzylpiperidin-3-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; 1-{3-[(dimethylamino)methyl]benzyl}-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-1-[2-(dimethylamino)ethyl]-5-hydroxy-6-oxo-1,6-di- hydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-6-oxo-1-(pyridin-3-ylmethyl)-1,6-dihydr- opyrimidine-4-carboxamide; N4-(4-fluorobenzyl)-5-hydroxy-1 methyl-N-2-(2-morpholin-4-ylethyl)-6-oxo-1,6-dihydropyrimidine-2,4-dicarb- oxamide; N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-[3-(pyrrolidin-1-ylmethyl)be- nzyl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-[3-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6- -dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-{3-[(4-methylpiperazin-1-yl)methyl]benzyl}- -6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-{3-[(4-pyridin-2-ylpiperazin-1-yl)me- thyl]benzyl}-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-[2-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6- -dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-{2-[(4-pyridin-2-ylpiperazin-1-yl)me- thyl]benzyl}-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-pyrrolidin-2-yl-1,6-dihydro- pyrimidine-4-carboxamide; N4-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-N-2-(pyridin-2-ylmethyl)-1,6- -dihydropyrimidine-2,4-dicarboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-(2-hydroxy-3-morpholin-4-ylpropyl)-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-[4-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6- -dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(2-morpholin-4-ylethyl)-6-oxo-1,6- -dihydropyrimidine-4-carboxamide; 2-(2,2-dimethoxyethyl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-di- hydropyrimidine-4-carboxamide; 2-(2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo- -1,6-dihydropyrimidine-4-carboxamide; 2-[2-(4-benzoylpiperazin-1-yl)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methy- l-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(N,N-dimethylglycyl)piperidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-2,3-dihydro-1H-indol-2-- yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-(1,2,3,4-tetrahydroquinolin- -2-yl)-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1,2,3,4-tetrahydroquino- lin-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide; tert-butyl (2S,4R)-4-(benzyloxy)-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-- methyl-6-oxo-1,6-dihydropyrimidin-2-yl)pyrrolidine-1-carboxylate; tert-butyl (2S,4R)-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1- ,6-dihydropyrimidin-2-yl)-4-hydroxypyrrolidine-1-carboxylate; 2-[(2S,4R)-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-4-hydroxypyrrolidin-2-yl]-1-methy- l-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R).sub.4-hydroxy-1-methylpyrrolidin-- 2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-4-(benzyloxy)-1-methylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-1-benzoyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-h- ydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(N,N-dimethylglycyl)-2,3-dihydro-1H-indol-2-yl]-N-(4-fluorobenzyl)-5- -hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-benzoyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-me- thyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)-2- ,3-dihydro-1H-indol-2-yl]-1,6-dihydropyrimidine-4-carboxamide; tert-butyl 3-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihyd- ropyrimidin-2-yl)-4-methylpiperazine-1-carboxylate; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; (+)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-ox- o-1,6-dihydropyrimidine-4-carboxamide (-)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-ox- o-1,6-dihydropyrimidine-4-carboxamide 2-(1-ethyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-meth- yl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(6-benzoylpiperidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)pi- peridin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(2-methyl-1,2,3,4-tetrahydroisoqu- inolin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-benzoylpyrrolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-- 1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)py- rrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methylpyrrolidin-2-yl)-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-4-(benzyloxy)-1-(pyridin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fl- uorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(dimethylamino)-2-phenylethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl- -6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-1-benzoyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydro- xy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-(1-isobutyl-2,3-dihydro-1H-indol-2-yl)-1-m- ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-(1-isopropyl-2,3-dihydro-1H-indol-2-yl)-1-- methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(N,N-dimethylglycyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-- methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{1-[(6-bromopyridin-2-yl)carbonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5- -hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methylpiperazin-2-yl)-6-oxo-1,- 6-dihydropyrimidine-4-carboxamide; 2-(1-benzoyl(methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)-1- ,2,3,4-tetrahydroquinolin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; 2-[1-(cyclopropylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1- -methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[1-(methylsulfonyl)pyrrolidin-2-y- l]-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(4-methylmorpholin-3-yl)carbo- nyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1,4-dimethylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-ox- o-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-3-ylcarbonyl)py- rrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-1-acetyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-(1-isonicotinoylpyrrolidin-2-yl)-1-methyl-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{1-[(ethylamino)carbonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-- 1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(1-methyl-1H-imidazol-2-yl)ca- rbonyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S,4R)-1-acetyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydrox- y-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(anilinocarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-met- hyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(4-ethyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-- 6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(1-oxidopyridin-2-yl)carbonyl- ]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrazin-2-ylcarbonyl)py- rrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; 2-[(4R)-3-acetyl-1,3-thiazolidin-4-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-met- hyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[1-methyl-4-(methylsulfonyl)piper- azin-2-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylthiomorpholin-3-yl)-6-ox- o-1,6-dihydropyrimidine-4-carboxamide; N-[4-fluoro-2-(methylsulfonyl)benzyl]-5-hydroxy-1-methyl-6-oxo-2-[1-(pyra- zin-2-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-N-[4-fluoro-2-(methylsulfonyl)benzyl]-5-hydro- xy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(3-acetyl-1,3-thiazolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6- -oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-(acetylamino)-1-methylethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6- -oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-N-(2-ethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1- ,6-dihydropyrimidine-4-carboxamide; 2-(4-acetyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl- -6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[1-methyl-4-(pyrazin-2-ylcarbonyl- )piperazin-2-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-5-hydroxy-1-methyl-N-[2-(methylthio)benzyl]-6- -oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-{1-[(1H-imidazol-5-ylcarbonyl)amino]-1-met- hylethyl}-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1-benzoyl-4-(pyrazin-2-ylcarbonyl)piperazin-2-yl]-N-(4-fluorobenzyl)-5- -hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(4-benzoyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methy- l-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[4 enzyloxy)-1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-h- ydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-- oxo-1,6-dihydropyrimidine-4-carboxamide; 2-(1-acetylpyrrolidin-2-yl)-5-hydroxy-N-(2-methoxybenzyl)-1-methyl-6-oxo-- 1,6-dihydropyrimidine-4-carboxamide; N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-d- ihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide; 2-(1-acetylpyrrolidin-2-yl)-N-[2-(dimethylamino)benzyl]-5-hydroxy-1-methy- l-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-1-acetylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-- oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[4-hydroxy-1-(pyrazin-2-ylcarbonyl)pyrroli- din-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-di- hydropyrimidin-2-yl)-1-methylethyl]imidazo[2,1-b][1,3]thiazole-6-carboxami- de; 2-[(2S,4S)-1-acetyl-4-fluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydr- oxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-methyl-4-[(1-methyl-1H-imidazo- l-2-yl)carbonyl]piperazin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl 1-{[(5-methyl-1,3,4-oxadiazol-2-yl)carbonyl]amino}ethyl)-6-oxo-1,6-dihydr- opyrimidine-4-carboxamide; N1-{1-[4-({[4-fluoro-2-(methylsulfonyl)benzyl]amino}carbonyl)-5-hydroxy-1- -methyl-6-oxo-1,6-dihydropyrimidin-2-yl]-1-methylethyl}-N2,N2-dimethyletha- nediamide; 2-(4-acetyl-1,2-dimethylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrimidin-4-ylcarbonyl)- pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrimidin-5-ylcarbonyl)- pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-methyl-1-[(1H-pyrazol-5-ylcarb- onyl)amino]ethyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2R,4R)-1-acetyl-4-methoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydrox- y-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-{1-[4-({[4-fluoro-2-(methylsulfonyl)benzyl]amino}carbonyl)-5-hydroxy-1-- methyl-6-oxo-1,6-dihydropyrimidin-2-yl]-1-methylethyl}imidazo[2,1-b][1,3]t- hiazole-6-carboxamide; 2-[(2R,4R)-1-benzoyl-4-methoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydro- xy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[4-(isopropylsulfonyl)-1-methylpiperazin-2- -yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[1,2-dimethyl-4-(methylsulfonyl)piperazin-2-yl]-N-(4-fluorobenzyl)-5-hy- droxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-4-methoxy-1-methylpyrrolidin-2-yl- ]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(methylsulfonyl)acetyl]pyrrol- idin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-1-acetyl-4,4-difluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydrox- y-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2R,4R)-1-acetyl-4-ethoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy- -1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-4,4-difluoro-1-methylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydrox- y-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridazin-3-ylcarb- onyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1-{[morpholin-4-yl(oxo)- acetyl]amino}ethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2R,4R)-1-[(dimethylamino)(oxo)acetyl]-4-methoxypyrrolidin-2-yl}-N-(4-- fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide- ; 2-[(2S)-4,4-difluoro-1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluor- obenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{(2S,4S)-1-methyl-4-[(methylsulfo- nyl)amino]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{1-[(dimethylamino)sulfonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydro- xy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2R,4R)-4-ethoxy-1-[(methylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-flu- orobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-4,4-difluoro-1-(pyridazin-3-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluo- robenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-[(2S)-4,4-difluoro-1-(pyridin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluoro- benzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2S)-1-[(dimethylamino)(oxo)acetyl]-4,4-difluoropyrrolidin-2-yl}-N-(4-- fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide- ; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[morpholin-4-yl(oxo)acetyl]py- rrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2S)-1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)- -5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2S)-1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluoro-2-meth- oxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-d- ihydropyrimidin-2-yl)-1-methylethyl]-N1,N2,N2-trimethylethanediamide; 2-[(2S)-1-acetylpyrrolidin-2-yl]-N-(4-fluoro-2-methoxybenzyl)-5-hydroxy-1- -methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N-(4-fluorobenzyl)-2-[(2S,4S)-4-fluoro-1-methylpyrrolidin-2-yl]-5-hydroxy- -1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; 2-{(2S,4S)-1-[(dimethylamino)(oxo)acetyl]-4-fluoropyrrolidin-2-yl}-N-(4-f- luorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide; N1-[1-(4-{[(3-chloro-4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-- oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide; and pharmaceutically acceptable salts thereof. 29. A pharmaceutical composition comprising a therapeutically effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 30. A pharmaceutical composition which comprises the product prepared by combining an effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 31. A compound according to claim 28, which is a compound selected from the group consisting of: N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-d- ihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide; N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1-{[(5-methyl-1,3,4-oxa- diazol-2-yl)carbonyl]amino}ethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamid- e; and pharmaceutically acceptable salts thereof. 32. A compound according to claim 31, which is N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-d- ihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide or a pharmaceutically acceptable salt thereof. 33. A pharmaceutical composition comprising a therapeutically effective amount of a compound according to claim 32, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 34. A compound according to claim 31, which is N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1-{[(5-methyl-1,3,4-oxa- diazol-2-yl)carbonyl]amino}ethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamid- e or a pharmaceutically acceptable salt thereof. 35. A pharmaceutical composition comprising a therapeutically effective amount of a compound according to claim 34, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. 36. A compound of Formula (I): ##STR00294## wherein R.sup.1 is (1) --H, (2) --C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)--C(.dbd.O)R.sup.b, or ##STR00295## (3) --R.sup.k, (4) --C.sub.1-6 alkyl-R.sup.k, wherein: (i) the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --N(R.sup.a)C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.bR.sup.c), or --N(R.sup.a)--C.sub.2-6 alkyl-OH with the proviso that the --OH is not attached to the carbon alpha to N(R.sup.a); and (ii) the alkyl is optionally mono-substituted with --R.sup.s, --C.sub.1-6 alkyl-R.sup.s, --N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-R.sup.s, --N(R.sup.a)--C.sub.0-6 alkyl-R.sup.s, --O--C.sub.0-6 alkyl-R.sup.s, or --N(R.sup.a)--C(.dbd.O)--C.sub.0-6 alkyl-R.sup.s; wherein R.sup.s is (a) aryl which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --C.sub.1-6 alkyl, --C.sub.1-6 alky-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, methylenedioxy attached to two adjacent carbon atoms, or aryl; (b) a 4- to 8- membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-16 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C(.dbd.O)--C.sub.0-6 alkyl-N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, oxo, aryl, or --C.sub.1-6 alkyl-aryl; or (c) a 5- to 7-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heteroaromatic ring is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, or aryl; (5) --C.sub.0-6 alkyl-O--C.sub.0-6 alkyl-R.sup.k, (6) --C.sub.0-6 alkyl-S(O).sub.n--C.sub.0-6 alkyl-R.sup.k, (7) --O--C.sub.1-16 alkyl-OR.sup.k, (8) --O--C.sub.1-16 alkyl-O--C.sub.1-6 alkyl-R.sup.k, (9) --O--C.sub.1-6 alkyl-S(O).sub.nR.sup.k, (10) --C.sub.0-6 alkyl-N(R.sup.a)--R.sup.k, (11) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.1-6 alkyl-R.sup.k, (12) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.1-6 alkyl-OR.sup.k, (13) --C.sub.0-6 alkyl-C(.dbd.O)--R.sup.k, (14) --C.sub.0-6 alkyl-C(.dbd.O)N(R.sup.a)--C.sub.0-6 alkyl-R.sup.k, (15) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)--C.sub.0-6 alkyl-R.sup.k, or (16) --C.sub.0-6 alkyl-N(R.sup.a)C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.k; R.sup.2 is --C.sub.1-6 alkyl which is optionally substituted with one or more substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --O--C.sub.1-6 alkyl, (5) --O--C.sub.1-6 haloalkyl, (6) --C(.dbd.O)R.sup.a, (7) --CO.sub.2R.sup.a, (8) --SR.sup.a, (9) --S(.dbd.O)R.sup.a, (10) --N(R.sup.aR.sup.b), (11) --C(.dbd.O)N(R.sup.aR.sup.b), (12) --N(R.sup.a)--C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.bR.sup.c), (13) --SO.sub.2R.sup.a, (14) --N(R.sup.a)SO.sub.2R.sup.b, (15) --SO.sub.2N(R.sup.aR.sup.b), (16) --N(R.sup.a)--C(R.sup.b).dbd.O, (17) --C.sub.3-8 cycloalkyl, (18) aryl, wherein the aryl is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C.sub.0-6 alkyl-N(R.sup.aR.sup.b), or --C.sub.1-6 alkyl substituted with a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; wherein the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently --C.sub.1-6 alkyl, oxo, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; or (19) a 5- to 8-membered monocyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; wherein the heterocycle is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl, --O--C.sub.1-6 alkyl, oxo, phenyl, or naphthyl; R.sup.3 is --H or --C.sub.1-6 alkyl; R.sup.4 is (1) H, (2) C.sub.1-6 alkyl which is substituted with one or more substituents each of which is independently halogen, --OH, O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --NO.sub.2, --N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, or --N(R.sup.a)CO.sub.2R.sup.b, (3) C.sub.1-6 alkyl which is optionally substituted with one or more substituents each of which is independently halogen, --OH, or O--C.sub.1-4 alkyl, and which is substituted with 1 or 2 substituents each of which is independently: (i) C.sub.3-8 cycloalkyl, (ii) aryl, (iii) a fused bicyclic carbocycle consisting of a benzene ring fused to a C.sub.5-7 cycloalkyl, (iv) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, (v) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or (vi) a 9- or 10-membered fused bicyclic heterocycle containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein at least one of the rings is aromatic, (4) C.sub.2-5 alkynyl optionally substituted with aryl, (5) C.sub.3-8 cycloalkyl optionally substituted with aryl, (6) aryl, (7) a fused bicyclic carbocycle consisting of a benzene ring fused to a C.sub.5-7 cycloalkyl, (8) a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, (9) a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or (10) a 9- or 10-membered fused bicyclic heterocycle containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein at least one of the rings is aromatic; wherein each aryl in (3)(ii) or the aryl (4), (5) or (6) or each fused carbocycle in (3)(iii) or the fused carbocycle in (7) is optionally substituted with one or more substituents each of which is independently halogen, --OH, --C.sub.1-6 alkyl, --C.sub.1-6 alkyl-OR.sup.a, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --CN, --NO.sub.2, --N(R.sup.aR.sup.b), --C.sub.1-6 alkyl-N(R.sup.aR.sup.b), --C(.dbd.O)N(R.sup.aR.sup.b), --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --C.sub.1-6 alkyl-CO.sub.2R.sup.a, --OCO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), --N(R.sup.a)C(.dbd.O)R.sup.b, --N(R.sup.a)CO.sub.2R.sup.b, --C.sub.1-6 alkyl-N(R.sup.a) CO.sub.2R.sup.b, aryl, --C.sub.1-6 alkyl-aryl, --O-aryl, or --C.sub.0-6 alkyl-het wherein het is a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, and het is optionally fused with a benzene ring, and is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, or --CO.sub.2R.sup.a; each saturated heterocyclic ring in (3)(iv) or the saturated heterocyclic ring in (8) is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and each heteroaromatic ring in (3)(v) or the heteroaromatic ring in (9) or each fused bicyclic heterocycle in (3)(vi) or the fused bicyclic heterocycle in (10) is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, or --C.sub.1-6 alkyl-aryl; or alternatively R.sup.3 and R.sup.4 together with the N to which both are attached form a C.sub.3-7 azacycloalkyl which is optionally substituted with one or more substituents each of which is independently --C.sub.1-6 alkyl or oxo; each R.sup.a, R.sup.b, R.sup.c, and R.sup.d is independently --H or --C.sub.1-6 alkyl; R.sup.k is carbocycle or heterocycle, wherein the carbocycle or heterocycle is optionally substituted with one or more substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (5) --O--C.sub.1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (6) --NO.sub.2, (7) oxo, (8) --C(.dbd.O)R.sup.a, (9) --CO.sub.2R.sup.a, (10) --SR.sup.a, (11) --S(.dbd.O)R.sup.a, (12) --N(R.sup.aR.sup.b), (13) --C(.dbd.O)N(R.sup.aR.sup.b), (14) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (15) --N(R.sup.a)C(.dbd.O)R.sup.b, (16) --SO.sub.2R.sup.a, (17) --SO.sub.2N(R.sup.aR.sup.b), (18) --N(R.sup.a)SO.sub.2R.sup.b, (19) --R.sup.m, (20) --C.sub.1-6 alkyl-R.sup.m, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (21) --C.sub.0-6 alkyl-N(R.sup.a)--C.sub.0-6 alkyl-R.sup.m, (22) --C.sub.0-6 alkyl-O--C.sub.0-6 alkyl-R.sup.m, (23) --C.sub.0-6 alkyl-S--C.sub.0-6 alkyl-R.sup.m, (24) --C.sub.0-6 alkyl-C(.dbd.O)--C.sub.0-6 alkyl-R.sup.m, (25) --C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.m, (26) --C(.dbd.O)N(R.sup.a)--C.sub.0-6 alkyl-R.sup.m, (27) --N(R.sup.a)C(.dbd.O)--R.sup.m, (28) --N(R.sup.a)C(.dbd.O)--C.sub.1-6 alkyl-R.sup.m, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, --OH, --CN, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --N(R.sup.a)CO.sub.2R.sup.b, --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (29) --N(R.sup.a)--C(.dbd.O)--N(R.sup.b)--C.sub.0-6 alkyl-R.sup.m, (30) --N(R.sup.a)--C(.dbd.O)--O--C.sub.0-6 alkyl-R.sup.m, (31) --N(R.sup.a)--C(.dbd.O)--N(R.sup.b)--SO.sub.2--C.sub.0-6 alkyl-R.sup.m; carbocycle in R.sup.k is (i) a C.sub.3 to C.sub.8 monocyclic, saturated or unsaturated ring, (ii) a C.sub.7 to C.sub.12 bicyclic ring system, or (iii) a C.sub.11 to C.sub.16 tricyclic ring system, wherein each ring in (ii) or (iii) is independent of or fused to the other ring or rings and each ring is saturated or unsaturated; heterocycle in R.sup.k is (i) a 4- to 8-membered, saturated or unsaturated monocyclic ring, (ii) a 7- to 12-membered bicyclic ring system, or (iii) an 11 to 16-membered tricyclic ring system; wherein each ring in (ii) or (iii) is independent of or fused to the other ring or rings and each ring is saturated or unsaturated; the monocyclic ring, bicyclic ring system, or tricyclic ring system contains from 1 to 6 heteroatoms selected from N, O and S and a balance of carbon atoms; and wherein any one or more of the nitrogen and sulfur heteroatoms is optionally be oxidized, and any one or more of the nitrogen heteroatoms is optionally quaternized; each R.sup.m is independently C.sub.3-8 cycloalkyl; aryl; a 5- to 8-membered monocyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; or a 9- to 10-membered bicyclic heterocycle which is saturated or unsaturated and contains from 1 to 4 heteroatoms independently selected from N, O and S; wherein any one or more of the nitrogen and sulfur heteroatoms in the heterocycle or bicyclic heterocycle is optionally oxidized and any one or more of the nitrogen heteroatoms is optionally quatemized; and wherein the cycloalkyl or the aryl defined in R.sup.m is optionally substituted with one or more sub stituents each of which is independently halogen, --C.sub.1-6 alkyl optionally substituted with --O--C.sub.1-4 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --N(R.sup.aR.sup.b), aryl, or --C.sub.1-6 alkyl-aryl; and the monocyclic or bicyclic heterocycle defined in R.sup.m is optionally substituted with one or more substituents each of which is independently halogen, --C.sub.1-6 alkyl, --C.sub.1-6 haloalkyl, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, oxo, aryl, --C.sub.1-6 alkyl-aryl, --C(.dbd.O)-aryl, --CO.sub.2-aryl, --CO.sub.2--C.sub.1-6 alkyl-aryl, a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and each n is independently an integer equal to zero, 1 or 2; or a pharmaceutically acceptable salt thereof. 37. The compound according to claim 36, wherein R.sup.k is C.sub.3-8 cycloalkyl; aryl selected from phenyl and naphthyl; a bicyclic carbocycle selected from indanyl and tetrahydronaphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered saturated or unsaturated heterocyclic ring containing from 1 to 3 heteroatoms independently selected from N, O and S; wherein the cycloalkyl, aryl, bicyclic carbocycle, saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally substituted with from 1 to 4 substituents each of which is independently (1) halogen, (2) --OH, (3) --CN, (4) --C.sub.1-4 haloalkyl, (5) --C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently --OH, --CN, --O--C.sub.1-4 alkyl, --O--C.sub.1-4haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (6) --O--C.sub.1-4 haloalkyl (7)--O--C.sub.1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently --OH, --CN, --O--C.sub.1-6 alkyl, --O--C.sub.1-6 haloalkyl, --C(.dbd.O)R.sup.a, --CO.sub.2R.sup.a, --SR.sup.a, --S(.dbd.O)R.sup.a, --N(R.sup.aR.sup.b), --C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.aR.sup.b), N(R.sup.a)--C(.dbd.O)--(CH.sub.2).sub.0-2N(R.sup.bR.sup.c), --SO.sub.2R.sup.a, --N(R.sup.a)SO.sub.2R.sup.b, --SO.sub.2N(R.sup.aR.sup.b), or --N(R.sup.a)--C(R.sup.b).dbd.O, (8) --N.sub.2, (9) oxo, (10) --C(.dbd.O)R.sup.a, (11) --CO.sub.2R.sup.a, (12) --SR.sup.a, (13) --S(.dbd.O)R.sup.a, (14) --N(R.sup.aR.sup.b), (15) --C(.dbd.O)N(R.sup.aR.sup.b), (16) --C(.dbd.O)--C.sub.1-6 alkyl-N(R.sup.aR.sup.b), (17) --N(R.sup.a)C(.dbd.O)R.sup.b, (18) --SO.sub.2R.sup.a, (18) --SO.sub.2N(R.sup.aR.sup.b), (19) --N(R.sup.a)SO.sub.2R.sup.b, (20) --R.sup.m, (21) --C.sub.1-4 alkyl-R.sup.m, (22) --(CH.sub.2).sub.0-2--N(R.sup.a)--(CH.sub.2).sub.0-2--R.sup.m, (23) --(CH.sub.2).sub.0-2--O--(CH.sub.2).sub.0-2--R.sup.m, (24) --(CH.sub.2).sub.0-2--S--(CH.sub.2).sub.0-2--R.sup.m, (25) --(CH.sub.2).sub.0-2--C(.dbd.O)--(CH.sub.2).sub.0-2--R.sup.m, (26) --C(.dbd.O)--O--(CH.sub.2).sub.0-2--R.sup.m, or (27) --C(.dbd.O)N(R.sup.a)--R.sup.m; or a pharmaceutically acceptable salt thereof. 38. The compound according to claim 37, wherein each R.sup.m is independently C.sub.3-7 cycloalkyl; aryl selected from phenyl and naphthyl; a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, wherein any N is optionally oxidized to form an N-oxide; or a bicyclic heterocycle which is a benzene ring fused to a 5- or 6-membered, saturated or unsaturated heterocyclic ring containing from 1 to 3 heteroatoms selected from N, O and S; wherein the cycloalkyl or the aryl defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, --N(R.sup.aR.sup.b), phenyl, or --(CH.sub.2).sub.1-2-phenyl; the saturated heterocyclic ring defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently --C.sub.1-4 alkyl optionally substituted with --O--C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, oxo, phenyl, --(CH.sub.2).sub.1-2-phenyl, --C(.dbd.O)-phenyl, --CO.sub.2-phenyl, --CO.sub.2--(CH.sub.2).sub.1-2-phenyl, a 5- or 6-membered saturated heterocyclic ring containing from 1 to 4 heteroatoms independently selected from N, O and S, or a 5- or 6-membered heteroaromatic ring containing from 1 to 4 heteroatoms independently selected from N, O and S; and the heteroaromatic ring or the bicyclic heterocycle defined in R.sup.m is optionally substituted with from 1 to 4 substituents each of which is independently halogen, --C.sub.1-4 alkyl, --C.sub.1-4 haloalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 haloalkyl, oxo, phenyl, or --(CH.sub.2).sub.1-2-phenyl; or a pharmaceutically acceptable salt thereof. 39. The compound according to claim 36, wherein R.sup.2 is methyl; or a pharmaceutically acceptable salt thereof. 40. The compound according to claim 36, wherein R.sup.3 is --H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 41. The compound according to claim 40, wherein R.sup.3 is --H or methyl; or a pharmaceutically acceptable salt thereof. 42. The compound according to claim 41, wherein R.sup.3 is --H; or a pharmaceutically acceptable salt thereof. 43. The compound according to claim 36, wherein R.sup.4 is --CH.sub.2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, --OH, --C.sub.1-4 alkyl, --C.sub.1-4 fluoroalkyl, --O--C.sub.1-4 alkyl, --O--C.sub.1-4 fluoroalkyl, --(CH.sub.2).sub.1-2--N(R.sup.aR.sup.b), --SO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--CO.sub.2R.sup.a, --(CH.sub.2).sub.0-2--N(R.sup.a)CO.sub.2R.sup.b, --NO.sub.2, or phenyl; and each R.sup.a and R.sup.b is independently is H or --C.sub.1-4 alkyl; or a pharmaceutically acceptable salt thereof. 44. The compound according to claim 43, wherein R.sup.4 is p-fluorobenzyl or 2,3-dimethoxybenzyl; or a pharmaceutically acceptable salt thereof.