# Patent

## Title
N-substituted hydroxypyrimidinone carboxamide inhibitors of HIV integrase

## Abstract

N-substituted 5-hydroxypyrimidin-6-one-4-carboxamides of formula:




are described as inhibitors of HIV integrase and inhibitors of HIV replication, wherein R1, R2, R3 and R4 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.

## Background
This application is a divisional of pending U.S. Ser. No. 10/493,280, filed Apr. 20, 2004, which is the National Stage of International Application No. PCT/GB02/004743, filed on Oct. 21, 2002, which claims the benefit under 35 U.S.C. 119(e) of U.S. Provisional Application Nos. 60/339,658 filed on Oct. 26, 2001 and 60/362,191 filed on Mar. 6, 2002.


FIELD OF THE INVENTION
The present invention is directed to N-substituted 5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamides and pharmaceutically acceptable salts thereof, their synthesis, and their use as inhibitors of the HIV integrase enzyme. The compounds and pharmaceutically acceptable salts thereof of the present invention are useful for preventing or treating infection by HIV and for treating or delaying the onset of AIDS.
BACKGROUND OF THE INVENTION
A retrovirus designated human immunodeficiency virus (HIV) is the etiological agent of the complex disease that includes progressive destruction of the immune system (acquired immune deficiency syndrome; AIDS) and degeneration of the central and peripheral nervous system. This virus was previously known as LAV, HTLV-III, or ARV. A common feature of retrovirus replication is the insertion by virally-encoded integrase of proviral DNA into the host cell genome, a required step in HIV replication in human T-lymphoid and monocytoid cells. Integration is believed to be mediated by integrase in three steps: assembly of a stable nucleoprotein complex with viral DNA sequences; cleavage of two nucleotides from the 3′ termini of the linear proviral DNA; covalent joining of the recessed 3′ OH termini of the proviral DNA at a staggered cut made at the host target site. The fourth step in the process, repair synthesis of the resultant gap, may be accomplished by cellular enzymes.
Nucleotide sequencing of HIV shows the presence of a pol gene in one open reading frame [Ratner, L. et al., Nature, 313, 277(1985)]. Amino acid sequence homology provides evidence that the pol sequence encodes reverse transcriptase, integrase and an HIV protease [Toh, H. et al., EMBO J. 4, 1267 (1985); Power, M. D. et al., Science, 231, 1567 (1986); Pearl, L. H. et al., Nature, 329, 351 (1987)]. All three enzymes have been shown to be essential for the replication of HIV.
It is known that some antiviral compounds which act as inhibitors of HIV replication are effective agents in the treatment of AIDS and similar diseases, including reverse transcriptase inhibitors such as azidothymidine (AZT) and efavirenz and protease inhbitors such as indinavir and nelfinavir. The compounds of this invention are inhibitors of HIV integrase and inhibitors of HIV replication. The inhibition of integrase in vitro and HIV replication in cells is a direct result of inhibiting the strand transfer reaction catalyzed by the recombinant integrase in vitro in HIV infected cells. The particular advantage of the present invention is highly specific inhibition of HIV integrase and HIV replication.
SUMMARY OF THE INVENTION
The present invention is directed to novel hydroxypyrimidinone carboxamides. These compounds are useful in the inhibition of HIV integrase, the prevention of infection by HIV, the treatment of infection by HIV and in the prevention, treatment, and delay in the onset of AIDS and/or ARC, either as compounds or their pharmaceutically acceptable salts or hydrates (when appropriate), or as pharmaceutical composition ingredients, whether or not in combination with other HIV/AIDS antivirals, anti-infectives, immunomodulators, antibiotics or vaccines. More particularly, the present invention includes a compound of Formula (I):




wherein

    R1 is
    
        (1) —H,
        (2) —C1-6 alkyl, which is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—C0-6 alkyl-N(RaRb), N(Ra)—C(═O)—C0-6 alkyl-N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), —N(Ra)—C(═O)Rb,
    
    






    
    
         or —N(R2)C(═O)C(═O)N(RaRb),
        (3) —Rk,
        (4) —C1-6 alkyl-Rk, wherein:
        
            (i) the alkyl is optionally substituted with one or more substituents(e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —N(RaRb), —N(Ra)CO2Rb, —N(Ra)C(═O)—C0-6 alkyl-N(RbRc), or —N(Ra)—C2-6 alkyl-OH with the proviso that the —OH is not attached to the carbon alpha to N(Ra); and
            (ii) the alkyl is optionally mono-substituted with —Rs, —C1-6 alkyl-Rs, —N(Ra)—C(═O)—C0-6 alkyl-Rs, —N(Ra)—C0-6 alkyl-Rs, —O—C0-6 alkyl-Rs, or —N(Ra)—C(═O)—C0-6 alkyl-Rs; wherein Rs is
            
                (a) aryl which is optionally substituted with one or more substituents (e.g., optionally from 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 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 (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —C(═O)—C0-6 alkyl-N(RaRb), —SO2Ra, oxo, aryl, or —C1-6 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 (e.g., optionally 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, or aryl;
            
            
        
        
        (5) —C0-6 alkyl-O—C0-6 alkyl-Rk,
        (6) —C0-6 alkyl-S(O)n—C0-6 alkyl-Rk,
        (7) —O—C1-6 alkyl-ORk,
        (8) —O—C1-6 alkyl-O—C1-6 alkyl-Rk,
        (9) —O—C1-6 alkyl-S(O)nRk,
        (10) —C0-6 alkyl-N(Ra)—Rk,
        (11) —C0-6 alkyl-N(Ra)—C1-6 alkyl-Rk,
        (12) —C0-6 alkyl-N(Ra)—C1-6 alkyl-ORk,
        (13) —C0-6 alkyl-C(═O)—Rk,
        (14) —C0-6 alkyl-C(═O)N(Ra)—C0-6 alkyl-Rk,
        (15) —C0-6 alkyl-N(Ra)C(═O)—C0-6 alkyl-Rk,
        (16) —C0-6 alkyl-N(Ra)C(═O)—O—C0-6 alkyl-Rk, or
        (17) —C0-6 alkyl-N(Ra)C(═O)C(═O)Rk;
    
    
    R2 is —C1-6 alkyl which is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently
    
        (1) halogen,
        (2) —OH,
        (3) —CN,
        (4) —O—C1-6 alkyl,
        (5) —O—C1-6 haloalkyl,
        (6) —C(═O)Ra,
        (7) —CO2Ra,
        (8) —SRa,
        (9) —S(═O)Ra,
        (10) —N(RaRb),
        (11) —C(═O)N(RaRb),
        (12) —N(Ra)—C(═O)—C1-6 alkyl-N(RbRc),
        (13) —SO2Ra,
        (14) —N(Ra)SO2Rb,
        (15) —SO2N(RaRb),
        (16) —N(Ra)—C(Rb)═O,
        (17) —C3-8 cycloalkyl,
        (18) aryl, wherein the aryl is optionally substituted with one or more substituents (e.g., optionally from 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of-which is independently halogen, —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C0-6 alkyl-N(RaRb), or —C1-6 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 —C1-6 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 (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently —C1-6 alkyl, —O—C1-6 alkyl, oxo, phenyl, or naphthyl;
    
    
    R3 is —H or —C1-6 alkyl;
    R4 is
    
        (1) H,
        (2) C1-6 alkyl which is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, O—C1-6 alkyl, —O—C1-6 haloalkyl, —NO2, —N(RaRb), —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —SO2Ra, or —N(Ra)CO2Rb,
        (3) C1-6 alkyl which is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, or O—C1-4 alkyl, and which is substituted with 1 or 2 substituents each of which is independently:
        
            (i) C3-8 cycloalkyl,
            (ii) aryl,
            (iii) a fused bicyclic carbocycle consisting of a benzene ring fused to a C5-7 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) C2-5 alkynyl optionally substituted with aryl,
        (5) C3-8 cycloalkyl optionally substituted with aryl,
        (6) aryl,
        (7) a fused bicyclic carbocycle consisting of a benzene ring fused to a C5-7 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 (e.g., optionally from 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —CN, —NO2, —N(RaRb), —C1-6 alkyl-N(RaRb), —C(═O)N(RaRb), —C(═O)Ra, —CO2Ra, —C1-6 alkyl-CO2Ra, —CO2Ra, —SRa, —S(═O)Ra, —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), N(Ra)C(═O)Rb, —N(Ra)CO2Rb, —C1-6 alkyl-N(Ra)CO2Rb, aryl, —C1-6 alkyl-aryl, —O-aryl, or —C0-6 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 (e.g., optionally from 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, or —CO2Ra;
            each saturated heterocyclic ring in (3)(iv) or the saturated heterocyclic ring in (8) is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 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 (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, aryl, or —C1-6 alkyl-aryl;
        
        
    
    
    or alternatively R3 and R4 together with the N to which both are attached form a C3-7 azacycloalkyl which is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently —C1-6 alkyl or oxo;
    each Ra, Rb, Rc, and Rd is independently —H or —C1-6 alkyl;
    Rk is carbocycle or heterocycle, wherein the carbocycle or heterocycle is optionally substituted with one or more substituents (e.g., optionally from 1 to 7, or 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently
    
        (1) halogen,
        (2) —OH,
        (3) —CN,
        (4) —C1-6 alkyl, which is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-2N(RaRb), N(Ra)—C(═O)—(CH2)0-2N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
        (5) —O—C1-6 alkyl, which is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-2N(RaRb), N(Ra)—C(═O)—(CH2)0-2N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
        (6) —NO2,
        (7) oxo,
        (8) —C(═O)Ra,
        (9) —CO2Ra,
        (10) —SRa,
        (11) —S(═O)Ra,
        (12) —N(RaRb),
        (13) —C(═O)N(RaRb),
        (14) —C(═O)—C1-6 alkyl-N(RaRb),
        (15) —N(Ra)C(═O)Rb,
        (16) —SO2Ra,
        (17) —SO2N(RaRb),
        (18) —N(Ra)SO2Rb,
        (19) —Rm,
        (20) —C1-6 alkyl-Rm, wherein the alkyl is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, —CN, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —N(Ra)CO2Rb, —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
        (21) —C0-6 alkyl-N(Ra)—C0-6 alkyl-Rm,
        (22) —C0-6 alkyl-O—C0-6 alkyl-Rm,
        (23) —C0-6 alkyl-S—C0-6 alkyl-Rm,
        (24) —C0-6 alkyl-C(═O)—C0-6 alkyl-Rm,
        (25) —C(═O)—O—C0-6 alkyl-Rm,
        (26) —C(═O)N(Ra)—C0-6 alkyl-Rm,
        (27) —N(Ra)C(═O)—Rm,
        (28) —N(Ra)C(═O)—C1-6 alkyl-Rm, wherein the alkyl is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —OH, —CN, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —N(Ra)CO2Rb, —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
        (29) —N(Ra)—C(═O)—N(Rb)—C0-6 alkyl-Rm,
        (30) —N(Ra)—C(═O)—O—C0-6 alkyl-Rm,
        (31) —N(Ra)—C(═O)—N(Rb)—SO2—C0-6 alkyl-Rm,
        (32) —C(═O)—C(═O)—N(RaRb),
        (33) —C(═O)—C1-6 alkyl-SO2Ra, or
        (34) —C(═O)—C(═O)Rm;
    
    
    carbocycle in Rk is (i) a C3 to C8 monocyclic, saturated or unsaturated ring, (ii) a C7 to C12 bicyclic ring system, or (iii) a C11 to C1-6 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 Rk 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 Rm is independently C3-8 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 Rm is optionally substituted with one or more substituents (e.g., optionally from 1 to 5, or 1 to 4, or 1 to 3, or 1 or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —C1-6 alkyl optionally substituted with —O—C1-4 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —N(RaRb), aryl, or —C1-6 alkyl-aryl; and
        the monocyclic or bicyclic heterocycle defined in Rm is optionally substituted with one or more substituents (e.g., optionally from 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or I or 2 substituents; or is optionally mono-substituted) each of which is independently halogen, —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, aryl, —C1-6 alkyl-aryl, —C(═O)-aryl, —CO2-aryl, —CO2—C1-6 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.


The present invention also includes pharmaceutical compositions containing a compound of the present invention and methods of preparing such pharmaceutical compositions. The present invention further includes methods of treating AIDS, methods of delaying the onset of AIDS, methods of preventing AIDS, methods of preventing infection by HIV, and methods of treating infection by HIV.
Other embodiments, aspects and features of the present invention are either further described in or will be apparent from the ensuing description, examples and appended claims.


DETAILED DESCRIPTION OF THE INVENTION
The present invention includes the N-substituted hydroxypyrimidinone carboxamides of Formula (I) above. These compounds and pharmaceutically acceptable salts thereof are HIV integrase inhibitors.
An embodiment of the present invention is a compound of Formula (I) exactly as defined above, except that in the definition of Rk, Rk is optionally substituted with one or more substituents each of which is independently one of the substituents (1) to (18), and is optionally mono-substituted with one of the substituents (19) to (34).
Another embodiment of the present invention is a compound of Formula (I) as originally defined above, except that the definition of R2 includes a proviso that none of the following optional substituents is attached to the carbon atom in the —C1-6 alkyl group that is attached to the ring nitrogen: halogen, —OH, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —SRa, —S(═O)Ra, or —N(Ra)—C(Rb)═O. Stated another way, none of these substituents is attached to the carbon atom alpha to the ring nitrogen.
Another embodiment of the present invention is a compound of Formula (I) as originally defined above except that in the definition of R1, R1 is one of substitutents (1) to (16) and in the definition of Rk, Rk is optionally substituted with one or more substituents (e.g., optionally from 1 to 7, or 1 to 6, or 1 to 5, or 1 to 4, or 1 to 3, or 1 to 2 substituents, or is optionally monosubstituted) each of which is independently one of substitutents (1) to (31).
Another embodiment of the present invention is a compound of Formula (I), wherein R1 is:

    
    
        (1) —H,
        (2) —C1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-3—N(RaRb), N(Ra)—C(═O)—(CH2)0-3—N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), —N(Ra)—C(═O)Rb,
    
    






    
    
         or —N(R2)C(═O)C(═O)N(RaRb),
        (3) Rk,
        (4) —(CH2)1-3—Rk, wherein:
        
            (i) the —(CH2)1-3— moiety is optionally substituted with one or more substituents each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —N(RaRb), —N(Ra)CO2Rb, —N(Ra)C(═O)—(CH2)0-3—N(RbRc), or —N(Ra)—(CH2)2-3—OH with the proviso that the —OH is not attached to the carbon alpha to N(Ra); and
            (ii) the —(CH2)1-3— moiety is optionally mono-substituted with —Rs, —C1-6 alkyl-Rs, —N(Ra)—C(═O)—(CH2)0-3—Rs, —N(Ra)—(CH2)0-3—Rs, —O—(CH2)0-3—Rs, or —N(Ra)—C(═O)—(CH2)0-3—Rs; wherein Rs is
            
                (a) aryl which is optionally substituted with one or more substituents each of which is independently halogen, —OH, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 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, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —C(═O)—(CH2)0-3—N(RaRb), —SO2Ra, oxo, aryl, or —(CH2)1-3-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, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, or aryl;
            
            
        
        
        (5) —(CH2)0-3—O—(CH2)0-3—Rk,
        (6) —(CH2)0-3—S(O)n—(CH2)0-3—Rk,
        (7) —(CH2)1-3—ORk,
        (8) —(CH2)1-3—O—(CH2)1-3—Rk,
        (9) —O—(CH2)1-3—S(O)nRk,
        (10) —(CH2)0-3—N(Ra)—Rk,
        (11) —(CH2)0-3—N(Ra)—(CH2)1-3—Rk,
        (12) —(CH2)0-3—N(Ra)—(CH2)1-3—ORk,
        (13) —(CH2)0-3—C(═O)—Rk,
        (14) —(CH2)0-3—C(═O)N(Ra)—(CH2)0-3—Rk,
        (15) —(CH2)0-3—N(Ra)C(═O)—(CH2)0-3—Rk,
        (16) —(CH2)0-3—N(Ra)C(═O)—O—(CH2)0-3—Rk,
        (17) —C(CH3)2N(Ra)C(═O)Rb,
        (18) —C(CH3)2N(Ra)C(═O)Rk, or
        (19) —C(CH3)2N(Ra)C(═O)C(═O)N(RbRc);
    
    
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this embodiment, R1 is one of groups (1) to (16).
Another embodiment of the present invention is a compound of Formula (I), wherein R1 is:

    
    
        (1) —H,
        (2) —C1-4 alkyl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —OH, —CN, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—C0-4 alkyl-N(RaRb), N(Ra)—C(═O)—C0-4 alkyl-N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), —N(Ra)—C(═O)Rb,
    
    






    
    
         —N(R2)C(═O)C(═O)N(RaRb),
        (3) —Rk,
        (4) —C1-4 alkyl-Rk, wherein:
        
            (i) the alkyl is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —OH, —CN, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —N(RaRb), —N(Ra)CO2Rb, —N(Ra)C(═O)—C0-4 alkyl-N(RbRc), or —N(Ra)—(CH2)2-4—OH; and
            (ii) the alkyl is optionally mono-substituted with —Rs, —N(Ra)—C(═O)—C0-4 alkyl-Rs, —N(Ra)—C0-4 alkyl-Rs, —O—C0-4 alkyl-Rs, or —N(Ra)—C(═O)—C0-4 alkyl-Rs; wherein Rs is
            
                (a) aryl which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, —OH, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 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, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 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, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —C(═O)—C0-4 alkyl-N(RaRb), —SO2Ra, oxo, or phenyl,
            
            
        
        
        (5) —(CH2)0-3—C(═O)N(Ra)—(CH2)0-3—Rk,
        (6) —C(C1-4 alkyl)2N(Ra)C(═O)Rb,
        (7) —C(C1-4 alkyl)2N(Ra)C(═O)Rk, or
        (8) —C(C1-4 alkyl)2N(Ra)C(═O)C(═O)N(RbRc);
    
    
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this embodiment, R1 is one of groups (1) to (5).
Another embodiment of the present invention is a compound of Formula (I), wherein R1 is:

    
    
        (1) —H,
        (2) —C1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —N(RaRb), or —C(═O)—(CH2)0-2-N(RaRb),
        (3) —Rk,
        (4) —(CH2)1-4—Rk, wherein:
        
            (i) the —(CH2)1-4— moiety is optionally substituted with 1 or 2 substituents each of which is independently halogen, —OH, —O—C1-4 alkyl, —O—C1-4 haloalkyl, or —N(RaRb); and
            (ii) the —(CH2)1-4— moiety is optionally mono-substituted with —Rs or —N(Ra)—(CH2)1-2—Rs; wherein Rs is
            
                (a) phenyl which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, or —O—C1-4 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, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, or —O—C1-4 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, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, or —CO2Ra,
            
            
        
        
        (5) —C(═O)N(Ra)—(CH2)0-3—Rk,
        (6) —C(CH3)2N(Ra)C(═O)Rb,
        (7) —C(CH3)2N(Ra)C(═O)Rk,
        (8) —C(CH3)2N(Ra)C(═O)C(═O)N(RbRc);
    
    
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this embodiment, R1 is one of groups (1) to (5).
Another embodiment of the present invention is a compound of Formula (I), wherein

    Rk is C3-8 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) —C1-4 haloalkyl,
        (5) —C1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently —OH, —CN, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-2N(RaRb), N(Ra)—C(═O)—(CH2)0-2N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
        (6) —O—C1-4 haloalkyl
        (7) —O—C1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-2N(RaRb), N(Ra)—C(═O)—(CH2)0-2N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
        (8) —NO2,
        (9) oxo,
        (10) —C(═O)Ra,
        (11) —CO2Ra,
        (12) —SRa,
        (13) —S(═O)Ra,
        (14) —N(RaRb),
        (15) —C(═O)N(RaRb),
        (16) —C(═O)—C1-6 alkyl-N(RaRb),
        (17) —N(Ra)C(═O)Rb,
        (18) —SO2Ra,
        (18) —SO2N(RaRb),
        (19) —N(Ra)SO2Rb,
        (20) —Rm,
        (21) —C1-4 alkyl-Rm,
        (22) —(CH2)0-2—N(Ra)—(CH2)0-2—Rm,
        (23) —(CH2)0-2—O—(CH2)0-2—Rm,
        (24) —(CH2)0-2—S—(CH2)0-2—Rm,
        (25) —(CH2)0-2—C(═O)—(CH2)0-2—Rm,
        (26) —C(═O)—O—(CH2)0-2—Rm,
        (27) —C(═O)N(Ra)—Rm, or
        (28) —C(═O)—C(═O)N(RaRb);
    
    
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this embodiment, 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 selected from the groups (1) to (27).
In an aspect of this embodiment, Rk (i.e., 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 one of the substituents (1) to (19), and is optionally mono-substituted with one of the substituents (20) to (28). In a feature of this aspect, Rk is optionally substituted with from 1 to 4 substituents each of which is independently one of the substituents (1) to (19), and is mono-substituted with one of the substituents (20) to (28).
In another aspect of this embodiment, each Rm is independently C3-7 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 Rm is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —C1-4 alkyl, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —N(RaRb), phenyl, or —(CH2)1-2-phenyl;
        the saturated heterocyclic ring defined in Rm is optionally substituted with from 1 to 4 substituents each of which is independently —C1-4 alkyl optionally substituted with —O—C1-4 alkyl, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, oxo, phenyl, —(CH2)1-2-phenyl, —C(═O)-phenyl, —CO2-phenyl, —CO2—(CH2)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 Rm is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —C1-4 alkyl, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, oxo, phenyl, or —(CH2)1-2-phenyl.
    
    


Another embodiment of the present invention is a compound of Formula (I), wherein Rk 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;

    and all other variables are as originally defined;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this embodiment,
(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) —CF3,
        (6) —C1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently —OH, —CN, —O—C1-4 alkyl, —OCF3, —N(RaRb), —C(═O)N(RaRb), or N(Ra)—C(═O)—(CH2)0-2N(RbRc),
        (7) —OCF3,
        (8) —O—C1-4 alkyl
        (9) —C(═O)Ra,
        (10) —CO2Ra,
        (11) —SRa,
        (12) —SRa,
        (13) —N(RaRb),
        (14) —C(═O)N(RaRb),
        (15) —C(═O)—(CH2)1-2—N(RaRb),
        (16) —N(Ra)C(═O)Rb, or
        (17) —SO2Ra;
    
    


(b) the phenyl is optionally mono-substituted with

    
    
        (1) —(CH2)1-2—Rm, or
        (2) —(CH2)0-2—N(Ra)—(CH2)0-2—Rm; and
    
    


(c) the saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally mono- or di-substituted with

    
    
        (1) oxo
        (2) —(CH2)1-2—Rm,
        (3) —O—(CH2)1-2—Rm, or
        (4) —(CH2)0-1—C(═O)—(CH2)0-2—Rm.
    
    


In a feature of the preceding aspect, each Rm 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, —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, or —N(RaRb);
        the saturated heterocyclic ring is optionally substituted with 1 or 2 substituents each of which is independently —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, oxo, phenyl, —(CH2)1-2-phenyl, —C(═O)-phenyl, —CO2-phenyl, or —CO2—CH2-phenyl; and
        the heteroaromatic ring is optionally substituted with 1 or 2 substituents each of which is independently —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, oxo, phenyl, or —(CH2)1-2-phenyl.
    
    


Another embodiment of the present invention is a compound of Formula (I), wherein R2 is:

    
    
        (1) —C1-6 alkyl,
        (2) —C1-6 alkyl substituted with —N(RaRb),
        (3) —C1-6 alkyl substituted with phenyl, wherein the phenyl is:
        
            (a) optionally substituted with from 1 to 4 substituents each of which is independently halogen, —C1-4 alkyl, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, or —C0-4 alkyl-N(RaRb); and
            (b) optionally mono-substituted with —C1-4 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 —C1-6 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) —C1-6 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 —C1-6 alkyl, —O—C1-6 alkyl, oxo, or phenyl; or
        (5) —C1-6 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 —C1-6 alkyl, —O—C1-6 alkyl, oxo, or phenyl;
    
    
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


Another embodiment of the present invention is a compound of Formula (I) exactly as defined in the immediately preceding embodiment, except that when R2 is —C1-6 alkyl substituted with —N(RaRb), it is with the proviso that —N(RaRb) is not attached to the carbon atom in the —C1-6 alkyl group that is attached to the ring nitrogen (i.e., that the —N(RaRb) group is not attached to the carbon atom alpha to the ring nitrogen).
Another embodiment of the present invention is a compound of Formula (I), wherein R2 is methyl;

    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


Another embodiment of the present invention is a compound of Formula (I), wherein R3 is —H or —C1-4 alkyl;

    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this embodiment, R3 is —H or methyl. In another aspect of this embodiment, R3 is —H.
Another embodiment of the present invention is a compound of Formula (I), wherein R4 is C1-4 alkyl substituted with an aryl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —OH, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —CN, —NO2, —N(RaRb), —C1-4 alkyl-N(RaRb), —C(═O)N(RaRb), —C(═O)Ra, —CO2Ra, —C1-4 alkyl-CO2Ra, —OCO2Ra, —SRa, —S(═O)Ra, —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), —N(Ra)C(═O)Rb, —N(Ra)CO2Rb, —C1-4 alkyl-N(Ra)CO2Rb, methylenedioxy attached to two adjacent ring carbon atoms, phenyl, —C1-4 alkyl-phenyl, —O—-phenyl, or —(CH2)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 —C1-4 alkyl, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, or —CO2Ra;

    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


Another embodiment of the present invention is a compound of Formula (I), wherein R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, —SRa, —N(RaRb) or phenyl;

    each Ra and Rb is independently is H or —C1-4 alkyl;
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


In an aspect of the preceding embodiment, R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents, each of which is independently —F, —Br, —Cl, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —SO2—C1-4 alkyl, —S—C1-4 alkyl, —N(CH3)2 or —O—C1-4 fluoroalkyl. In another aspect of the preceding embodiment, R4 is p-fluorobenzyl or 2,3-dimethoxybenzyl.
In another aspect of the preceding embodiment, the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, or phenyl.
In an aspect of the preceding embodiment, the phenyl is optionally substituted with from 1 to 3 substituents, each of which is independently —F, —Br, —Cl, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, or —O—C1-4 fluoroalkyl. In another aspect of the preceding embodiment, R4 is p-fluorobenzyl or 2,3-dimethoxybenzyl.
A class of compounds of the present invention includes any compound of Formula (1), wherein

    R1 is —Rk;
    Rk is phenyl which is
    
        (a) optionally substituted with from 1 to 3 substituents each of which is independently:
        
            (1) halogen,
            (2) —C1-6 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-2N(RaRb), N(Ra)—C(═O)—(CH2)0-2N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
            (3) —C1-6 haloalkyl,
            (4) —O—C1-6 haloalkyl,
            (5) —C(═O)Ra,
            (6) —CO2Ra,
            (7) —C(═O)N(RaRb), or
            (8) —C(═O)—C1-6 alkyl-N(RaRb); and
        
        
        (b) optionally mono-substituted with
        
            (1) —C1-4 alkyl-Rm, or
            (2) —C0-4 alkyl-N(Ra)—C0-4 alkyl-Rm;
        
        
    
    
    wherein Rm 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 Rm is optionally substituted with from 1 to 3 substituents each of which is independently halogen, —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, or —N(RaRb);
        the saturated heterocyclic ring defined in Rm is optionally substituted with from 1 to 3 substituents each of which is independently —C1-4 alkyl or oxo, and is additionally optionally mono-substituted with phenyl, —(CH2)1-2-phenyl, —C(═O)-phenyl, —CO2-phenyl, —CO2—(CH2)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 Rm is optionally substituted with 1 or 2 substituents each of which is independently —C1-4 alkyl or oxo;
    
    
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


A sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (I), wherein

    R2 is methyl;
    R3 is —H;
    R4 is:
    
        (1) —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, —SRa, —N(RaRb) or phenyl; or
        (2) a fused bicyclic carbocycle selected from
    
    






    
    
         wherein Z1 is —H or —OH; and
    
    
    each Ra and Rb is independently is H or —C1-4 alkyl;
    and all other variables are as defined in the class;
    or a pharmaceutically acceptable salt thereof.


Another sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (I), wherein R4 is 4-fluorobenzyl or 2,3-dimethoxybenzyl;

    and all other variables are as defined in the class;
    or a pharmaceutically acceptable salt thereof.


Still another sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (I), wherein R2 is methyl; R3 is —H; R4 is 4-fluorobenzyl or 2,3-dimethoxybenzyl; each Ra and Rb is independently is H or —C1-4 alkyl; and all other variables are as defined in the class; or a pharmaceutically acceptable salt thereof.
Another class of the present invention includes any compound of Formula (II):




wherein

    Q is:
    
        (1) methyl which is optionally substituted with 1 or 2 of —O—C1-4 alkyl,
        (2) phenyl which is optionally substituted with from 1 to 3 substituents each of which is independently —F, ≦Cl, Br, —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, 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, —C1-4 alkyl, oxo, phenyl, or —C(═O)-phenyl;
    
    
    T is:
    
        (1) —H,
        (2) —OH,
        (3) methyl or ethyl, optionally substituted with —OH or —O—C1-4 alkyl,
        (4) —O—C1-4 alkyl
        (5) —N(RaRb),
        (6) —N(Ra)—(CH2)2—OH,
        (7) —N(Ra)—CO2Rb,
        (8) —N(Ra)—C(═O)—(CH2)1-2—N(RaRb),
        (9) —Rs,
        (10) —(CH2)1-2—Rs, or
        (11) —(CH2)0-2—N(Ra)—(CH2)0-3—Rs;
    
    
    Rs is:
    
        (1) phenyl optionally substituted with from 1 to 4 substituents each of which is independently halogen, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, or —N(RaRb);
        (2) 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 from 1 to 4 substituents each of which is independently —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, oxo, phenyl, or —CH2-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 —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, or oxo;
    
    
    R2 is
    
        (1) —C1-4 alkyl,
        (2) —C1-4 alkyl substituted with —N(RaRb), or
        (3) —C1-4 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 —C1-4 alkyl;
    
    
    R3 is —H or —C1-4 alkyl;
    R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)C0-2Rb, —NO2, —SRa, —N(RaRb) or phenyl;
    each Ra and Rb is independently is H or —C1-4 alkyl; and
    s is an integer equal to zero, 1, or 2;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this class, R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, or phenyl
A sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (II) exactly as defined in the preceding class, except that when R2 is —C1-4 alkyl substituted with —N(RaRb), it is with the proviso that —N(RaRb) is not attached to the carbon atom in the —C1-4 alkyl group that is attached to the ring nitrogen (i.e., that the —N(RaRb) group is not attached to the carbon atom alpha to the ring nitrogen).
Another sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (II), wherein

    Q is phenyl;
    T is:
    
        (1) —H,
        (2) —N(RaRb),
        (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 —C1-4 alkyl or —C(═O)Ra, or
        (4) —N(Ra)—(CH2)1-2-heteroaromatic, wherein the heteroaromatic is a 5- or 6-membered ring containing 1 or 2 N atoms;
    
    
    R2 is methyl;
    R3 is —H; and
    R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with 1 or 2 substituents each of which is independently —F, —Cl, —Br, —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —SO2CH3, —SCH3, —N(CH3)2 or —OCF3;
    each Ra and Rb is independently —H, methyl or ethyl; and
    s is an integer equal to zero or 1;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this subclass, R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with 1 or 2 substituents each of which is independently —F, —Cl, —Br, —C1-4 alkyl, —CF3, —O—C1-4 alkyl, or —OCF3.
Another class of compounds of the present invention includes any compound of Formula (I), wherein

    R1 is —Rk;
    Rk 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) —C1-4 alkyl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-2N(RaRb), N(Ra)—C(═O)—(CH2)0-2N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
        (2) —OH,
        (3) —C(═O)Ra,
        (4) —CO2Ra,
        (5) —C(═O)N(RaRb),
        (6) —C(═O)—C1-6 alkyl-N(RaRb),
        (7) —SRa,
        (8) —S(═O)Ra,
        (9) —SO2Ra,
        (10) —N(RaRb),
        (11) —Rm,
        (12) —C1-4 alkyl-Rm, wherein the alkyl is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —OH, —CN, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —N(Ra)CO2Rb, —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
        (13) —C0-4 alkyl-N(Ra)—C0-4 alkyl-Rm,
        (14) —C0-4 alkyl-O—C0-4 alkyl-Rm,
        (15) —C0-4 alkyl-S—C0-4 alkyl-Rm,
        (16) —C0-4 alkyl-C(═O)—C0-4 alkyl-Rm,
        (17) —C(═O)—O—C0-4 alkyl-Rm, or
    
    
    (18) —C(═O)N(Ra)—C0-4 alkyl-Rm;
    wherein each Rm is independently —C3-6 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, —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, or —N(RaRb);
        the saturated heterocyclic ring is optionally substituted with from 1 to 3 substituents each of which is independently —C1-4 alkyl or oxo, and is additionally optionally mono-substituted with phenyl, —(CH2)1-2-phenyl, —C(═O)-phenyl, —CO2-phenyl, or —CO2—(CH2)1-2-phenyl; and
        the heteroaromatic ring is optionally substituted with 1 or 2 substituents each of which is independently halogen, —C1-4 alkyl, or oxo;
    
    
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


A sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (I), wherein

    R1 is:






    R8 is:
    
        (1) —H,
        (2) —C1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently —OH, —O—C1-4 alkyl, —OCF3, —C(═O)Ra, —CO2Ra, —SRa, —N(RaRb), or —C(═O)N(RaRb),
        (3) —C(═O)Ra,
        (4) —CO2Ra,
        (5) —C(═O)N(RaRb),
        (6) —C(═O)—(CH2)1-2—N(RaRb),
        (7) —SO2Ra,
        (8) —(CH2)1-2—Rm,
        (9) —(CH2)0-2—C(═O)—(CH2)0-2—Rm,
        (10) —C(═O)—O—(CH2)0-2—Rm, or
        (11) —C(═O)N(Ra)—(CH2)0-2—Rm;
    
    
    R10 is —H, —OH, —C1-4 alkyl, —O—C1-4 alkyl, —N(RaRb), or —O—(CH2)1-2—Rm;
    R12 is
    
        (1) —H,
        (2) —C1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently —OH, —O—C1-4 alkyl, —OCF3, —C(═O)Ra, —CO2Ra, —SRa, —N(RaRb), or —C(═O)N(RaRb),
        (3) —C(═O)Ra,
        (4) —CO2Ra,
        (5) —C(═O)—(CH2)1-2—N(RaRb), or
        (6) —SO2Ra;
    
    
    R2 is methyl;
    R3 is —H or methyl;
    R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, —SRa, —N(RaRb) or phenyl; and
    each Ra and Rb is independently —H or —C1-4 alkyl;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this subclass, R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, or phenyl.
Another class of the present invention includes any compound of Formula (III):




wherein R2 is:

    
    
        (1) —C1-6 alkyl,
        (2) —C1-6 alkyl substituted with —N(RaRb),
        (3) —C1-6 alkyl substituted with phenyl which is:
        
            (a) optionally substituted with from 1 to 4 substituents each of which is independently halogen, —C1-4 alkyl, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, or —C0-6 alkyl-N(RaRb); and
            (b) optionally mono-substituted with —C1-4 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 —C1-6 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) —C1-6 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 —C1-6 alkyl, —O—C1-6 alkyl, oxo, or phenyl; or
        (5) —C1-6 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 —C1-6 alkyl, —O—C1-6 alkyl, oxo, or phenyl;
    
    
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


A sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (III) exactly as defined in the preceding class, except that when R2 is —C1-6 alkyl substituted with —N(RaRb), it is with the proviso that —N(RaRb) is not attached to the carbon atom in the —C1-6 alkyl group that is attached to the ring nitrogen (i.e., that the —N(RaRb) group is not attached to the carbon atom alpha to the ring nitrogen).
Another sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (III), wherein

    R2 is:
    
        (1) —C1-4 alkyl,
        (2) —(CH2)1-3—N(RaRb),
        (3) —(CH2)1-3-phenyl, wherein the phenyl is:
        
            (a) optionally substituted with from 1 to 3 substituents each of which is independently fluoro, chloro, bromo, —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —O—CF3, or —(CH2)1-3—N(RaRb); and
            (b) optionally mono-substituted with —(CH2)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 —C1-4 alkyl or pyridyl;
        
        
        (4) —(CH2)1-3-saturated heterocycle, wherein the —(CH2)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 —C1-4 alkyl; or
        (5) —(CH2)1-3-pyridyl;
    
    
    R3 is —H or methyl;
    R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, —SRa, —N(RaRb) or phenyl and;
    each Ra and Rb is independently is H or —C1-4 alkyl;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this subclass, R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, or phenyl.
Another class of compounds of the present invention includes any compound of Formula (I), wherein

    R1 is —C(═O)NH—(CH2)1-2—Rk; and
    Rk 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;
    and all other variables are as originally defined above;
    or a pharmaceutically acceptable salt thereof.


A sub-class of the preceding class of compounds of the present invention includes any compounds of Formula (I), wherein

    R1 is —C(═O)NH—(CH2)1-2—Rk; and
    Rk 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;
    R2 is methyl;
    R3 is —H or methyl;
    R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, —SRa, —N(RaRb) or phenyl; and
    each Ra and Rb is independently —H or —C1-4 alkyl;
    or a pharmaceutically acceptable salt thereof.


In an aspect of this subclass, R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents each of which is independently fluoro, bromo, chloro, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —O—C1-4 fluoroalkyl, —(CH2)1-2—N(RaRb), —SO2Ra, —(CH2)0-2—CO2Ra, —(CH2)0-2—N(Ra)CO2Rb, —NO2, or phenyl.
It is to be understood that additional embodiments of the present invention include, but are not limited to, compounds of Formula I wherein each of two or three or more of R1, R2, R3, R4, Ra, Rb, Rc, Rd, Rk and Rm is independently defined in accordance with its definition in one of the embodiments or an aspect thereof as set forth above, or in accordance with its definition in one of the foregoing classes set forth above or a sub-class or feature thereof. Any and all possible combinations of these variables in Formula I are additional embodiments within the scope of the present invention.
An aspect of the present invention is a compound selected from the group consisting of

    N-(2-ethoxybenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(2,3-dimethoxybenzyl)-2-{4-[(dimethylamino)methyl]phenyl}-5-hydroxy-1-methyl-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-ylmethyl)phenyl]-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(pyrrolidin-1-ylmethyl)phenyl]-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(piperidin-1-ylmethyl)phenyl]-1,6-dihydropyrimidine-4-carboxamide;
    N-(2,3-dimethoxybenzyl)-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-(morpholin-4-ylmethyl)phenyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{4-[(4-methylpiperazin-1-yl)methyl]phenyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-{4-[(diethylamino)methyl]phenyl}-N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-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-dihydropyrimidine-4-carboxamide;
    2-benzyl-N-(2,3-dimethoxybenzyl)-1-[2-(dimethylamino)ethyl]-5-hydroxy-6-oxo-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-ylpiperidin-1-yl)methyl]phenyl}-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-[4-fluoro-2-(trifluoromethyl)benzyl]-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(3-chloro-4-methylbenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-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-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-2-(4-{[(2R)-2-(methoxymethyl)pyrrolidin-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-4-ylethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(pyridin-3-ylmethyl)-1,6-dihydropyrimidine-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-dihydropyrimidine-4-carboxamide;
    N-(2,3-dimethoxybenzyl)-5-hydroxy-6-oxo-1-(pyridin-3-ylmethyl)-1,6-dihydropyrimidine-4-carboxamide;
    N4-(4-fluorobenzyl)-5-hydroxy-1-methyl-N2-(2-morpholin-4-ylethyl)-6-oxo-1,6-dihydropyrimidine-2,4-dicarboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-[3-(pyrrolidin-1-ylmethyl)benzyl]-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)methyl]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)methyl]benzyl}-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-pyrrolidin-2-yl-1,6-dihydropyrimidine-4-carboxamide;
    N4-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-N2-(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-dihydropyrimidine-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-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[1-(N,N-dimethylglycyl)piperidin-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-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-tetrahydroquinolin-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-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-4-hydroxypyrrolidin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-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-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2S,4R)-1-benzoyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-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-methyl-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-dihydropyrimidin-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-oxo-1,6-dihydropyrimidine-4-carboxamide
    (−)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide
    2-(1-ethyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-(1-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)piperidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(2-methyl-1,2,3,4-tetrahydroisoquinolin-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)pyrrolidin-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-fluorobenzyl)-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-hydroxy-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-methyl-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-4-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-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(4-methylmorpholin-3-yl)carbonyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-(1,4-dimethylpiperazin-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-3-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2S,4R)-1-acetyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-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)carbonyl]pyrrolidin-2-yl}-6-ox6-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2S,4R)-1-acetyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[1-(anilinocarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-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)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide;
    2-[(4R)-3-acetyl-1,3-thiazolidin-4-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-(methylsulfonyl)piperazin-2-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylthiomorpholin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-[4-fluoro-2-(methylsulfonyl)benzyl]-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide;
    2-(1-acetylpyrrolidin-2-yl)-N-[4-fluoro-2-(methylsulfonyl)benzyl]-5-hydroxy-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-methylethyl}-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-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[4-(benzyloxy)-1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-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-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide;
    2-(1-acetylpyrrolidin-2-yl)-N-[2-(dimethylamino)benzyl]-5-hydroxy-1-methyl-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)pyrrolidin-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-dihydropyrimidin-2-yl)-1-methylethyl]imidazo[2, 1-b][1,3]thiazole-6-carboxamide;
    2-[(2S,4S)-1-acetyl-4-fluoropyrrolidin-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-[(1-methyl-1H-imidazol-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-dihydropyrimidine-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-dimethylethanediamide;
    2-(4-acetyl-1,2-dimethylpiperazin-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-(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-ylcarbonyl)amino]ethyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2R,4R)-1-acetyl-4-methoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-{1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl }-N-(4-fluorobenzyl)-5-hydroxy-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]thiazole-6-carboxamide;
    2-[(2R,4R)-1-benzoyl-4-methoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-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-hydroxy-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]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2S)-1-acetyl-4,4-difluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-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-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridazin-3-ylcarbonyl)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-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{(2S,4S)-1-methyl-4-[(methylsulfonyl)amino]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-{1-[(dimethylamino)sulfonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-{(2R,4R)-4-ethoxy-1-[(methylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-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-fluorobenzyl)-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-fluorobenzyl)-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]pyrrolidin-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-methoxybenzyl)-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-dihydropyrimidin-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-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N1-[1-(4-{[(3-chloro4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide;

and pharmaceutically acceptable salts thereof.



Another aspect of the present invention is a compound selected from the group consisting of:

    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2S,4R)-1-benzoyl-4-hydroxypyrrolidin-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;
    2-(1-acetylpyrrolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2S,4R)-4-(benzyloxy)-1-(pyridin-2-ylcarbonyl)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-(4-methylmorpholin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    (+)-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-oxo-1,6-dihydropyrimidine-4-carboxamide
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)pyrrolidin-2-yl]-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-[(2S,4R)-1-benzoyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2S,4R)-1-acetyl-4-(benzyloxy)pyrrolidin-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-3-ylcarbonyl)pyrrolidin-2-yl]-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-(1,4-dimethylpiperazin-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)carbonyl]pyrrolidin-2-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-2-[1-(methylsulfonyl)pyrrolidin-2-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[(4R)-3-acetyl-1,3-thiazolidin4-yl]-N-(4-fluorobenzyl)-5-hydroxy-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;
    2-(4-ethyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    2-[(2S,4R)-4-(benzyloxy)-1-methylpyrrolidin-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)-2,3-dihydro-1H-indol-2-yl]-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1,2,3,4-tetrahydroquinolin-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(2-methyl-1,2,3,4-tetrahydroisoquinolin-3-yl)-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-[(dimethylamino)(phenyl)methyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide;
    N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-2-[4-(morpholin-4-ylmethyl)phenyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide;

and pharmaceutically acceptable salts thereof.



Other embodiments of the present invention include the following:
(a) A pharmaceutical composition comprising a compound of Formula (I) and a pharmaceutically acceptable carrier.
(b) A pharmaceutical composition which comprises the product prepared by combining (e.g., mixing) an effective amount of a compound of Formula (I) and a pharmaceutically acceptable carrier.
(c) The pharmaceutical composition of (a) or (b), further comprising a therapeutically effective amount of an HIV infection/AIDS treatment agent selected from the group consisting of HIV/AIDS antiviral agents, immunomodulators, and anti-infective agents.
(d) The pharmaceutical composition of (c), wherein the HIV infection/AIDS treatment agent is an antiviral selected from the group consisting of HIV protease inhibitors, non-nucleoside HIV reverse transcriptase inhibitors, and nucleoside HIV reverse transcriptase inhibitors.
(e) A combination useful for inhibiting HIV integrase, for treating or preventing infection by HIV, or for preventing, treating or delaying the onset of AIDS, which is a therapeutically effective amount of a compound of Formula (I) and a therapeutically effective amount of an HIV infection/AIDS treatment agent selected from the group consisting of HIV/AIDS antiviral agents, immunomodulators, and anti-infective agents.
(f) The combination of (e), wherein the HIV infection/AIDS treatment agent is an antiviral selected from the group consisting of HIV protease inhibitors, non-nucleoside HIV reverse transcriptase inhibitors and nucleoside HIV reverse transcriptase inhibitors.
(g) A method of inhibiting HIV integrase in a subject in need thereof which comprises administering to the subject a therapeutically effective amount of a compound of Formula (I).
(h) A method of preventing or treating infection by HIV in a subject in need thereof which comprises administering to the subject a therapeutically effective amount of a compound of Formula (I).
(i) The method of (h), wherein the compound of Formula (I) is administered in combination with a therapeutically effective amount of at least one antiviral selected from the group consisting of HIV protease inhibitors, non-nucleoside HIV reverse transcriptase inhibitors, and nucleoside HIV reverse transcriptase inhibitors.
(j) A method of preventing, treating or delaying the onset of AIDS in a subject in need thereof which comprises administering to the subject a therapeutically effective amount of a compound of Formula (I).
(k) The method of (j), wherein the compound is administered in combination with a therapeutically effective amount of at least one antiviral selected from the group consisting of HIV protease inhibitors, non-nucleoside HIV reverse transcriptase inhibitors, and nucleoside HIV reverse transcriptase inhibitors
(l) A method of inhibiting HIV integrase in a subject in need thereof which comprises administering to the subject the pharmaceutical composition of (a), (b), (c) or (d) or the combination of (e) or (f).
(m) A method of preventing or treating infection by HIV in a subject in need thereof which comprises administering to the subject the pharmaceutical composition of (a), (b), (c) or (d) or the combination of (e) or (f).
(n) A method of preventing, treating or delaying the onset of AIDS in a subject in need thereof which comprises administering to the subject the pharmaceutical composition of (a), (b), (c) or (d) or the combination of (e) or (f).
The present invention also includes a compound of the present invention (i) for use in, (ii) for use as a medicament for, or (iii) for use in the preparation of a medicament for: (a) inhibiting HIV protease, (b) preventing or treating infection by HIV, or (c) preventing, treating or delaying the onset of AIDS. In these uses, the compounds of the present invention can optionally be employed in combination with one or more HIV/AIDS treatment agents selected from HIV/AIDS antiviral agents, anti-infective agents, and immunomodulators.
Additional embodiments of the invention include the pharmaceutical compositions, combinations and methods set forth in (a)–(n) above and the uses set forth in the preceding paragraph, wherein the compound of the present invention employed therein is a compound of one of the embodiments, aspects, classes, sub-classes, or features of the compounds described above. In all of these embodiments, the compound may optionally be used in the form of a pharmaceutically acceptable salt.
As used herein, the term “C1-6 alkyl” (or “C1–C6 alkyl”) means linear or branched chain alkyl groups having from 1 to 6 carbon atoms and includes all of the hexyl alkyl and pentyl alkyl isomers as well as n-, iso-, sec- and t-butyl, n- and isopropyl, ethyl and methyl. “C1-4 alkyl” means n-, iso-, sec- and t-butyl, n- and isopropyl, ethyl and methyl.
The term “C0” as employed in expressions such as “C0-6 alkyl” means a direct covalent bond. For example, when R1 in Compound I is —C0-6 alkyl-O—C0-6 alkyl-Rk, then R1 is —O—Rk when both alkyl groups are C0 alkyl. Similarly, when an integer defining the presence of a certain number of atoms in a group is equal to zero, it means that the atoms adjacent thereto are connected directly by a bond. For example, the compound of Formula (II) has




as a substituent at the 2-position of the pyrimidinone ring, wherein s is an integer equal to zero, 1 or 2. When s is zero, the substituent has the following structure:





The term “—C1-6 alkyl-” refers to a C1 to C6 linear or branched alkyl group as just defined which is bivalent. It can alternatively be referred to as “C1-6 alkylene” or “C1-6 alkanediyl”. A class of alkylenes of particular interest with respect to the invention is —(CH2)1-6—, and sub-classes of particular interest include —(CH2)1-4—, —(CH2)1-3—, —(CH2)1-2—, and —CH2—.
The term “C2-5 alkynyl” (or “C2–C5 alkynyl”) means linear or branched chain alkynyl groups having from 2 to 5 carbon atoms and includes all of the pentynyl isomers as well as 1-butynyl, 2-butynyl, 3-butynyl, 1-propynyl, 2-propynyl, and ethynyl (or acetylenyl). Similar terms such as “C2-3 alkynyl” have an analogous meaning.
The term “C3-8 cycloalkyl” (or “C3–C8 cycloalkyl”) means a cyclic ring of an alkane having three to eight total carbon atoms (i.e., cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, or cyclooctyl). The terms “C3-7 cycloalkyl”, “C3-6 cycloalkyl”, “C5-7 cycloalkyl” and the like have analogous meanings.
The term “C3-7 azacycloalkyl” (or “C3–C7 azacycloalkyl”) means a saturated cyclic ring consisting of one nitrogen and from three to seven carbon atoms (i.e., azetidinyl, pyrrolidinyl, piperidinyl, or azepanyl).
The term “halogen” (or “halo”) refers to fluorine, chlorine, bromine and iodine (alternatively referred to as fluoro, chloro, bromo, and iodo).
The term “C1-6 haloalkyl” (which may alternatively be referred to as “C1–C6 haloalkyl” or “halogenated C1–C6 alkyl”) means a C1 to C6 linear or branched alkyl group as defined above with one or more halogen substituents. The term “C1-4 haloalkyl” has an analogous meaning. The term “C1-6 fluoroalkyl” has an analogous meaning except that the halogen substituents are restricted to fluoro. Suitable fluoroalkyls include the series (CH2)0-4CF3 (i.e., trifluoromethyl, 2,2,2-trifluoroethyl, 3,3,3-trifluoro-n-propyl, etc.).
The term “carbocycle” (and variations thereof such as “carbocyclic” or “carbocyclyl”) as used herein refers to (i) a C3 to C8 monocyclic, saturated or unsaturated ring, (ii) a C7 to C12 bicyclic ring system, or (iii) a C11 to C16 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 carbocycle may be attached to the rest of the molecule at any carbon atom which results in a stable compound. The fused bicyclic carbocycles are a subset of the carbocycles; i.e., the term “fused bicyclic carbocycle” generally refers to a C7 to C10 bicyclic ring system in which each ring is saturated or unsaturated and two adjacent carbon atoms are shared by each of the rings in the ring system. Fused tricyclic carbocycles have an analogous meaning. A subset of the fused bicyclic carbocycles are those bicyclic carbocycles in which one ring is a benzene ring and the other ring is saturated or unsaturated, with attachment via any carbon atom that results in a stable compound. Representative examples of this subset include the following:




The term “aryl” refers to aromatic mono- and poly-carbocyclic ring systems, wherein the individual carbocyclic rings in the polyring systems are fused or attached to each other via a single bond. Suitable aryl groups include phenyl, naphthyl, and biphenylenyl.
The term “heterocycle” (and variations thereof such as “heterocyclic” or “heterocyclyl”) broadly refers to (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, and the monocyclic ring, bicyclic ring system, or tricyclic ring system contains one or more heteroatoms (e.g., from 1 to 6 heteroatoms, or from 1 to 4 heteroatoms) selected from N, O and S and a balance of carbon atoms (the monocylic ring typically contains at least one carbon atom and the ring systems typically contain at least two 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. The heterocyclic ring may be attached at any heteroatom or carbon atom, provided that attachment results in the creation of a stable structure. When the heterocyclic ring has substituents, it is understood that the substituents may be attached to any atom in the ring, whether a heteroatom or a carbon atom, provided that a stable chemical structure results.
Saturated heterocyclics form a subset of the heterocycles; i.e., the term “saturated heterocyclic” generally refers to a heterocycle as defined above in which the entire ring system (whether mono- or poly-cyclic) is saturated. The term “saturated heterocyclic ring” refers to a 4- to 8-membered saturated monocyclic ring which consists of carbon atoms and one or more heteroatoms selected from N, O and S. Representative examples include piperidinyl, piperazinyl, azepanyl, pyrrolidinyl, pyrazolidinyl, imidazolidinyl, oxazolidinyl, isoxazolidinyl, morpholinyl, thiomorpholinyl, thiazolidinyl, isothiazolidinyl, and tetrahydrofuryl (or tetrahydrofuranyl).
Heteroaromatics form another subset of the heterocycles; i.e., the term “heteroaromatic” (alternatively “heteroaryl”) generally refers to a heterocycle as defined above in which the entire ring system (whether mono- or poly-cyclic) is an aromatic ring system. The term “heteroaromatic ring” refers a 5- or 6-membered monocyclic aromatic ring which consists of carbon atoms and one or more heteroatoms selected from N, O and S. Representative examples of heteroaromatic rings include pyridyl, pyrrolyl, pyrazinyl, pyrimidinyl, pyridazinyl, thienyl (or thiophenyl), thiazolyl, furanyl, imidazolyl, pyrazolyl, triazolyl, tetrazolyl, oxazolyl, isooxazolyl, oxadiazolyl, thiazolyl, isothiazolyl, and thiadiazolyl.
Representative examples of bicyclic heterocycles include benzotriazolyl, indolyl, isoindolyl, indazolyl, indolinyl, isoindolinyl, quinoxalinyl, quinazolinyl, cinnolinyl, chromanyl, isochromanyl, tetrahydroquinolinyl, quinolinyl, tetrahydroisoquinolinyl, isoquinolinyl, 2,3-dihydrobenzofuranyl, 2,3-dihydrobenzo-1,4-dioxinyl




imidazo(2,1-b)(1,3)thiazole,





and benzo-1,3-dioxolyl





In certain contexts herein,





is alternatively referred to as phenyl having as a substituent methylenedioxy attached to two adjacent carbon atoms.

Representative examples of tricyclic heterocycles include phenothiazinyl, carbazolyl, beta-carbolinyl, tetrahydro-beta-carbolinyl, acridinyl, phenazinyl, and phenoxazinyl.
Unless expressly stated to the contrary, an “unsaturated” ring is a partially or fully unsaturated ring. For example, an “unsaturated monocyclic C6 carbocycle” refers to cyclohexene, cyclohexadiene, and benzene.
Unless expressly stated to the contrary, all ranges cited herein are inclusive. For example, a heterocycle described as containing from “1 to 4 heteroatoms” means the heterocycle can contain 1, 2, 3 or 4 heteroatoms.
When any variable (e.g., Ra, Rb, Rc, Rk, etc.) occurs more than one time in any constituent or in Formula I or in any other formula depicting and describing compounds of the invention, its definition on each occurrence is independent of its definition at every other occurrence. Also, combinations of substituents and/or variables are permissible only if such combinations result in stable compounds.
The term “substituted” (e.g., as in “aryl which is optionally substituted with one or more substituents . . . ;”) includes mono- and poly-substitution by a named substituent to the extent such single and multiple substitution (including multiple substitution at the same site) is chemically allowed.
The compounds of the present invention may have asymmetric centers and may occur, except when specifically noted, as mixtures of stereoisomers or as individual diastereomers, or enantiomers, with all isomeric forms being included in the present invention.
The N-substituted hydroxypyrimidinone compounds of the present invention may also occur as tautomers thereof. It is understood that the present invention includes all tautomers of the hydroxypyrimidinone compounds of Formula I, both singly and in mixtures.
The compounds of the present invention are useful in the inhibition of HIV integrase, the prevention or treatment of infection by human immunodeficiency virus (HIV) and the prevention, treatment or the delay in the onset of consequent pathological conditions such as AIDS. Preventing AIDS, treating AIDS, delaying the onset of AIDS, or preventing or treating infection by HIV is defined as including, but not limited to, treatment of a wide range of states of HIV infection: AIDS, ARC (AIDS related complex), both symptomatic and asymptomatic, and actual or potential exposure to HIV. For example, the compounds of this invention are useful in treating infection by HIV after suspected past exposure to HIV by such means as blood transfusion, exchange of body fluids, bites, accidental needle stick, or exposure to patient blood during surgery.
The compounds of this invention are useful in the preparation and execution of screening assays for antiviral compounds. For example, the compounds of this invention are useful for isolating enzyme mutants, which are excellent screening tools for more powerful antiviral compounds. Furthermore, the compounds of this invention are useful in establishing or determining the binding site of other antivirals to HIV integrase, e.g., by competitive inhibition. Thus the compounds of this invention are commercial products to be sold for these purposes.
Compounds representative of the present invention have been tested for inhibition in an assay for the strand transfer activity of integrase. The assay is conducted in accordance with Wolfe, A. L. et al., J. Virol. 1996, 70: 1424–1432, for recombinant integrase, except that: (i) the assay uses preassembled integrase strand transfer complexes; (ii) the strand transfer reaction is performed in the presence of inhibitor in 2.5 mM MgCl2 using 0.5 to 5 nM of a 3′ FITC labeled target DNA substrate as described in WO 02/30930 and (iii) strand transfer products are detected using an alkaline phosphatase conjugated anti-FITC antibody and a chemiluminescent alkaline phosphatase substrate. Representative compounds (e.g., the compounds set forth in Table 1 below) tested in the integrase assay demonstrated IC50's of about 5 micromolar or less.
Further description on conducting the assay using preassembled complexes is found in Hazuda et al., J. Virol. 1997, 71: 7005–7011; Hazuda et al., Drug Design and Discovery 1997, 15: 17–24; and Hazuda et al., Science 2000, 287: 646–650.
Certain compounds representative of the present invention have also been tested in an assay for inhibition of acute HIV infection of T-lymphoid cells, conducted in accordance with Vacca, J. P. et al., Proc. Natl. Acad. Sci. USA 1994, 91: 4096. These compounds demonstrated IC95's of about 20 micromolar or less.
The compounds of the present invention may be administered in the form of pharmaceutically acceptable salts. The term “pharmaceutically acceptable salt” refers to a salt which possesses the effectiveness of the parent compound and which is not biologically or otherwise undesirable (e.g., is neither toxic nor otherwise deleterious to the recipient thereof). Suitable salts include acid addition salts which may, for example, be formed by mixing a solution of the compound of the present invention with a solution of a pharmaceutically acceptable acid such as hydrochloric acid, sulfuric acid, acetic acid, trifluoroacetic acid, or benzoic acid. When the compounds of the invention carry an acidic moiety, suitable pharmaceutically acceptable salts thereof can include alkali metal salts (e.g., sodium or potassium salts), alkaline earth metal salts (e.g., calcium or magnesium salts), and salts formed with suitable organic ligands such as quaternary ammonium salts. Also, in the case of an acid (—COOH) or alcohol group being present, pharmaceutically acceptable esters can be employed to modify the solubility or hydrolysis characteristics of the compound.
For the purpose of preventing or treating HIV infection or preventing, treating or delaying the onset of AIDS, the compounds of the present invention may be administered orally, parenterally (including subcutaneous injections, intravenous, intramuscular, intrasternal injection or infusion techniques), by inhalation spray, or rectally, in the form of a unit dosage of a pharmaceutical composition containing a therapeutically effective amount of the compound and conventional non-toxic pharmaceutically-acceptable carriers, adjuvants and vehicles.
The term “administration” and variants thereof (e.g., “administering” a compound) in reference to a compound of the invention mean providing the compound or a prodrug of the compound to the individual in need of treatment. When a compound of the invention or a prodrug thereof is provided in combination with one or more other active agents (e.g., antiviral agents useful for treating HIV infection or AIDS), “administration” and its variants are each understood to include concurrent and sequential provision of the compound or prodrug and other agents.
As used herein, the term “composition” is intended to encompass a product comprising the specified ingredients in the specified amounts, as well as any product which results, directly or indirectly, from combining the specified ingredients in the specified amounts.
By “pharmaceutically acceptable” is meant that the ingredients of the pharmaceutical composition must be compatible with each other and not deleterious to the recipient thereof.
The term “subject” (alternatively referred to herein as “patient”) as used herein refers to an animal, preferably a mammal, most preferably a human, who has been the object of treatment, observation or experiment.
The term “therapeutically effective amount” as used herein means that amount of active compound or pharmaceutical agent that elicits the biological or medicinal response in a tissue, system, animal or human that is being sought by a researcher, veterinarian, medical doctor or other clinician, which includes alleviation of the symptoms of the disease being treated. When the active compound (i.e., active ingredient) is administered as the salt, references to the amount of active ingredient are to the free acid or free base form of the compound.
The pharmaceutical compositions may be in the form of orally-administrable suspensions or tablets or capsules, nasal sprays, sterile injectible preparations, for example, as sterile injectible aqueous or oleagenous suspensions or suppositories. These compositions can be prepared by methods and contain excipients which are well known in the art. Suitable methods and ingredients are described in Remington's Pharmaceutical Sciences, 18th edition, edited by A. R. Gennaro, Mack Publishing Co., 1990, which is herein incorporated by reference in its entirety.
The compounds of this invention can be administered orally in a dosage range of 0.001 to 1000 mg/kg of mammal (e.g., human) body weight per day in a single dose or in divided doses. One preferred dosage range is 0.01 to 500 mg/kg body weight per day orally in a single dose or in divided doses. Another preferred dosage range is 0.1 to 100 mg/kg body weight per day orally in single or divided doses. For oral administration, the compositions can be provided in the form of tablets or capsules containing 1.0 to 500 milligrams of the active ingredient, particularly 1, 5, 10, 15, 20, 25, 50, 75, 100, 150, 200, 250, 300, 400, and 500 milligrams of the active ingredient for the symptomatic adjustment of the dosage to the patient to be treated. The specific dose level and frequency of dosage for any particular patient may be varied and will depend upon a variety of factors including the activity of the specific compound employed, the metabolic stability and length of action of that compound, the age, body weight, general health, sex, diet, mode and time of administration, rate of excretion, drug combination, the severity of the particular condition, and the host undergoing therapy.
As noted above, the present invention is also directed to use of the HIV integrase inhibitor compounds of the present invention with one or more agents useful in the treatment of HIV infection or ADS. For example, the compounds of this invention may be effectively administered, whether at periods of pre-exposure and/or post-exposure, in combination with effective amounts of one or more of the HIV/AIDS antivirals, immunomodulators, antiinfectives, or vaccines useful for treating HIV infection or AIDS. Suitable antiviral agents include those listed in the following Table:










ANTIVIRALS










Manufacturer




(Tradename and/or


Drug Name
Location)
Indication (Activity)





abacavir
Glaxo Welcome
HIV infection, AIDS, ARC (nRTI)


GW 1592
(ZIAGEN ®)


1592U89


abacavir +
GlaxoSmithKline
HIV infection, AIDS, ARC


lamivudine +
(TRIZIVIR ®)
(nnRTI)


zidovudine


acemannan
Carrington Labs
ARC



(Irving, TX)


ACH 126443
Achillion Pharm.
HIV infections, AIDS, ARC




(nucleoside reverse




transcriptase inhibitor)


acyclovir
Burroughs Wellcome
HIV infection, AIDS, ARC,




in combination with AZT


AD-439
Tanox Biosystems
HIV infection, AIDS, ARC


AD-519
Tanox Biosystems
HIV infection, AIDS, ARC


adefovir dipivoxil
Gilead
HIV infection, AIDS, ARC


GS 840

(RTI)


AL-721
Ethigen
ARC, PGL, HIV positive,



(Los Angeles, CA)
AIDS


alpha interferon
Glaxo Wellcome
Kaposi's sarcoma, HIV, in




combination w/Retrovir


AMD3100
AnorMed
HIV infection, AIDS,




ARC




(CXCR4 antagonist)


amprenavir
Glaxo Wellcome
HIV infection, AIDS,


141 W94
(AGENERASE ®)
ARC (PI)


GW 141


VX478 (Vertex)


ansamycin
Adria Laboratories
ARC


LM 427
(Dublin, OH)



Erbamont



(Stamford, CT)


antibody which neutralizes
Advanced Biotherapy
AIDS, ARC


pH labile alpha aberrant
Concepts (Rockville,


Interferon
MD)


AR177
Aronex Pharm
HIV infection, AIDS, ARC


atazanavir (BMS 232632)
Bristol-Myers-Squibb
HIV infection, AIDS, ARC



(ZRIVADA ®)
(PI)


beta-fluoro-ddA
Nat'l Cancer Institute
AIDS-associated diseases


BMS-232623
Bristol-Myers Squibb/
HIV infection, AIDS,


(CGP-73547)
Novartis
ARC (PI)


BMS-234475
Bristol-Myers Squibb/
HIV infection, AIDS,


(CGP-61755)
Novartis
ARC (PI)


capravirine
Pfizer
HIV infection, AIDS,


(AG-1549, S-1153)

ARC (nnRTI)


CI-1012
Warner-Lambert
HIV-1 infection


cidofovir
Gilead Science
CMV retinitis, herpes,




papillomavirus


curdlan sulfate
AJI Pharma USA
HIV infection


cytomegalovirus immune
MedImmune
CMV retinitis


globin


cytovene
Syntex
sight threatening CMV


ganciclovir

peripheral CMV




retinitis


delavirdine
Pharmacia-Upjohn
HIV infection, AIDS,



(RESCRIPTOR ®)
ARC (nnRTI)


dextran Sulfate
Ueno Fine Chem. Ind.
AIDS, ARC, HIV



Ltd. (Osaka, Japan)
positive asymptomatic


ddC
Hoffman-La Roche
HIV infection, AIDS, ARC


(zalcitabine,
(HIVID ®)
(nRTI)


dideoxycytidine)


ddI
Bristol-Myers Squibb
HIV infection, AIDS, ARC;


Dideoxyinosine
(VIDEX ®)
combination with AZT/d4T




(nRTI)


DPC 681 & DPC 684
DuPont
HIV infection, AIDS, ARC




(PI)


DPC 961 & DPC 083
DuPont
HIV infection AIDS, ARC




(nnRTRI)


emvirine
Triangle Pharmaceuticals
HIV infection, AIDS, ARC



(COACTINON ®)
(non-nucleoside reverse




transcriptase inhibitor)


EL10
Elan Corp, PLC
HIV infection



(Gainesville, GA)


efavirenz
DuPont
HIV infection, AIDS,


(DMP 266)
(SUSTIVA ®)
ARC (nnRTI)



Merck (STOCRIN ®)


famciclovir
Smith Kline
herpes zoster, herpes




simplex


emtricitabine
Triangle Pharmaceuticals
HIV infection, AIDS, ARC


FTC
(COVIRACIL ®)
(nRTI)



Emory University


emvirine
Triangle Pharmaceuticals
HIV infection, AIDS, ARC



(COACTINON ®)
(non-nucleoside reverse




transcriptase inhibitor)


HBY097
Hoechst Marion Roussel
HIV infection, AIDS, ARC




(nnRTI)


hypericin
VIMRx Pharm.
HIV infection, AIDS, ARC


recombinant human
Triton Biosciences
AIDS, Kaposi's sarcoma,


interferon beta
(Almeda, CA)
ARC


interferon alfa-n3
Interferon Sciences
ARC, AIDS


indinavir
Merck (CRIXIVAN ®)
HIV infection, AIDS, ARC,




asymptomatic HIV positive,




also in combination with




AZT/ddI/ddC




(PI)


ISIS 2922
ISIS Pharmaceuticals
CMV retinitis


JE2147/AG1776
Agouron
HIV infection, AIDS, ARC




(PI)


KNI-272
Nat'l Cancer Institute
HIV-assoc. diseases


lamivudine, 3TC
Glaxo Wellcome
HIV infection, AIDS,



(EPIVIR ®)
ARC; also with AZT




(nRTI)


lobucavir
Bristol-Myers Squibb
CMV infection


lopinavir (ABT-378)
Abbott
HIV infection, AIDS, ARC




(PI)


lopinavir + ritonavir
Abbott (KALETRA ®)
HIV infection, AIDS, ARC


(ABT-378/r)

(PI)


mozenavir
AVID (Camden, NJ)
HIV infection, AIDS, ARC


(DMP-450)

(PI)


nelfinavir
Agouron
HIV infection, AIDS,



(VIRACEPT ®)
ARC (PI)


nevirapine
Boeheringer
HIV infection, AIDS,



Ingleheim
ARC (nnRTI)



(VIRAMUNE ®)


novapren
Novaferon Labs, Inc.
HIV inhibitor



(Akron, OH)


pentafusaide
Trimeris
HIV infection, AIDS, ARC


T-20

(fusion inhibitor)


peptide T
Peninsula Labs
AIDS


octapeptide
(Belmont, CA)


sequence


PRO 542
Progenics
HIV infection, AIDS, ARC




(attachment inhibitor)


PRO 140
Progenics
HIV infection, AIDS, ARC




(CCR5 co-receptor inhibitor)


trisodium
Astra Pharm. Products,
CMV retinitis, HIV infection,


phosphonoformate
Inc
other CMV infections


PNU-140690
Pharmacia Upjohn
HIV infection, AIDS, ARC




(PI)


probucol
Vyrex
HIV infection, AIDS


RBC-CD4
Sheffield Med. Tech
HIV infection, AIDS,



(Houston TX)
ARC


ritonavir
Abbott
HIV infection, AIDS,


(ABT-538)
(RITONAVIR ®)
ARC (PI)


saquinavir
Hoffmann-LaRoche
HIV infection, AIDS,



(FORTOVASE ®)
ARC (PI)


stavudine; d4T
Bristol-Myers Squibb
HIV infection, AIDS, ARC


didehydrodeoxythymidine
(ZERIT ®)
(nRTI)


T-1249
Trimeris
HIV infection, AIDS, ARC




(fusion inhibitor)


TAK-779
Takeda
HIV infection, AIDS, ARC




(injectable CCR5 receptor




antagonist)


tenofovir
Gilead (VIREAD ®)
HIV infection, AIDS, ARC




(nRTI)


tipranavir (PNU-140690)
Boehringer Ingelheim
HIV infection, AIDS, ARC




(PI)


TMC-120 & TMC-125
Tibotec
HIV infections, AIDS, ARC




(nnRTI)


TMC-126
Tibotec
HIV infection, AIDS, ARC




(PI)


valaciclovir
Glaxo Wellcome
genital HSV & CMV




infections


virazole
Viratek/ICN (Costa
asymptomatic HIV positive,


ribavirin
Mesa, CA)
LAS, ARC


zidovudine; AZT
Glaxo Wellcome
HIV infection, AIDS, ARC,



(RETROVIR ®)
Kaposi's sarcoma in




combination with other




therapies (nRTI)





PI = protease inhibitor


nnRTI = non-nucleoside reverse transcriptase inhibitor


nRTI = nucleoside reverse transcriptase inhibitor






A compound of the present invention can also be administered in combination with another HIV integrase inhibitor such as a compound described in WO 99/62513,WO 99/62520, or WO 99/62897. A compound of the present invention can also be administered in combination with a CCR5 receptor antagonist, such as a compound described in WO 99/04794, WO 99/09984, WO 99/38514, WO 00/59497, WO 00/59498, WO 00/59502, WO 00/59503, WO 00/76511, WO 00/76512, WO 00/76513, WO 00/76514, WO 00/76792, or WO 00/76793. The compounds of this invention may be effectively administered, whether at periods of pre-exposure and/or post-exposure, in combination with effective amounts of one or more HIV/AIDS antivirals, immunomodulators, antiinfectives, or vaccines useful for treating HIV infection or ADS disclosed in the Table in WO 01/38332, which is herein incorporated by reference in its entirety.
It will be understood that the scope of combinations of the compounds of this invention with HIV/AIDS antivirals, immunomodulators, anti-infectives or vaccines is not limited to those listed above or listed in the above-referenced Table in WO 01/38332, but includes in principle any combination with any pharmaceutical composition useful for the treatment of AIDS. The HIV/AIDS antivirals and other agents will typically be employed in these combinations in their conventional dosage ranges and regimens as reported in the art, including the dosages described in the Physicians' Desk Reference, 54th edition, Medical Economics Company, 2000. The dosage ranges for a compound of the invention in these combinations are the same as those set forth above.
Abbreviations used in the instant specification, particularly the Schemes and Examples, include the following:
AIDS=acquired immunodeficiency syndrome

    
    
        ARC=AIDS related complex
        BOC or Boc=t-butyloxycarbonyl
        Bn=benzyl
        Bz=benzoyl
        CBZ or Cbz=carbobenzoxy (alternatively, benzyloxycarbonyl)
        DMAD=dimethylacetylenedicarboxylate
        DMAP=dimethylaminopyridine
        DMF=N,N-dimethylformamide
        Et=ethyl
        EtOAc=ethyl acetate
        FIA-MS=flow injection analysis mass spectrometry
        HIV=human immunodeficiency virus
        HPLC=high performance liquid chromatography
        m-CPBA=meta-chloroperbenzoic acid
        Me=methyl
        NMP=N-methyl pyrrolidinone
        NMR=nuclear magnetic resonance
        Ph=phenyl
        TFA=trifluoroacetic acid
        THF=tetrahydrofuran
    
    


The compounds of the present invention can be readily prepared according to the following reaction schemes and examples, or modifications thereof, using readily available starting materials and reagents. In these reactions, it is also possible to make use of variants which are themselves known to those of ordinary skill in this art, but are not mentioned in greater detail. Furthermore, other methods for preparing compounds of the invention will be readily apparent to the person of ordinary skill in the art in light of the following reaction schemes and examples. Unless otherwise indicated, all variables are as defined above.
The compounds of the present invention can be prepared by coupling suitable substituted alkyl 1-alkyl-1,6-dihydro-5-hydroxy-6-oxopyrimidine-4-carboxylates (or carboxylic acids or halides) with the appropriate amines, as represented by Scheme 1. In the scheme, P is H or a protective group, typically an ester (e.g., benzoate or pivalate) that is normally removed under the conditions employed to convert the the methyl ester to the amide. The ester protective group is typically used to purify the 2-substituted-5,6 dihydroxypyrimidine-4-carboxylates after their synthesis when the unprotected product cannot be crystallized from the reaction crude and/or for synthetic reasons.




Methods for coupling carboxylic acid derivatives with amines to form carboxamides are well known in the art. Suitable methods are described, for example, in Jerry March, Advanced Organic Chemistry, 3rd edition, John Wiley & Sons, 1985, pp. 370–376. Amines of formula 1-1 can be prepared using the methods described in Richard Larock, Comprehensive Organic Transformations, VCH Publishers Inc, 1989, pp. 385–438, or routine variations thereof.
Methyl 1-alkyl-1,6-dihydro-5-hydroxy-6-oxopyrimidine-4-carboxylates of formula 1-2 can be prepared as shown in Scheme 2, wherein amidoxime 2-1 can be reacted with DMAD in an appropriate solvent and at a suitable temperature to give the intermediate dihydroxypyrimidine 2-2, followed by protection of the 5-hydroxy group in 2-2 with a suitable protecting agent such as benzoate or pivalate to give 2-3, and then alkylation of nitrogen-1 to afford 1-2. This procedure is described in the literature [Culbertson et al., J Heterocycl. Chem. 1979, 16 (7): 1423–24]. Dihydroxypyrimidine 2-2 can be isolated or directly protected to give 2-3. The alkyl group can be introduced on N, by reaction of 2-3 with an alkylating agent in the presence of an inorganic base (e.g., cesium carbonate). If a mixture of N— and O-alkylated derivatives results, the desired N-alkylated product 1-2 can be separated by flash chromatography. Scheme 2 is exemplified in Example 1.




Methyl 1-alkyl-1,6-dihydro-5-hydroxy-6-oxopyrimidine-4-carboxylates of formula 1-2 can be prepared as shown in Scheme 3, wherein an N-alkylamidoxime 3-1 can be reacted with dimethylacetylenedicarboxylate to give the unprotected 1-2 (P═H). The unprotected compound can be isolated as such or it can be converted to 1-2 by reaction with a suitable protecting group. Scheme 3 is exemplified in Example 2.




Amidoximes 2-1 and 3-1 are prepared from the corresponding nitrites 15 by chemistry described herein (see Example 1, Step 1 and Example 2, Step 2). Nitriles can be prepared from carboxylic acids by various procedures known in the art, including, for example, conversion to carboxamides by the procedure of of Pozdnev (Tetrahedron Lett. 1989, 30: 5193) (see also, Example 6, Step 2), and dehydration of the amide by the procedure of Waldmann (Tetrahedron 1994, 50: 11865) (see also, Example 6, Step 3).
Compounds of the present invention of general formula 3-3 or 3-6 can be prepared in accordance with Scheme 3, Parts 1 and 2, wherein haloderivative 3-1 or 3–4 can be synthesized by the bromination or chlorination of a suitable substrate affording a —CH2Br, —CH2Cl, —CHBr—, or —CHCl— group, followed by displacement of the halogen with a nucleophile (“Nu”) such as an amine, thiol, or alcoholate to obtain the nucleophile-substituted methyl ester intermediate 3-2 or 3-5, which need not be isolated. Elaboration of the methyl ester functionality into the carboxamide will afford the final product 3-3 or 3–6. Scheme 3 is exemplified in Example 5.




Scheme 4 depicts the preparation of compounds of the invention that contain an alkylated aliphatic amine in the substituent at the 2 position. Nitrogen alkylation is achieved via a reductive amination or alkylation. The nitrogen alkylation can be performed before formation of the amide (via 4-3) or after formation of the amide (via 4-2) depending on the substrate, with suitable deprotection as necessary. Scheme 4 is exemplified in Examples 6 to 8 below.




Compounds of the present invention with general formula 5-3 containing an acylated nitrogen or sulfonylated nitrogen in the substituent at the 2-position, can be prepared following Scheme 5. Acylation or sulfonylation of the nitrogen in the 2-substituent of the pyrimidine core provides compound 5-2, which can be elaborated into the final amide 5-3 by reaction of a suitable amine in a polar solvent. Scheme 5 is exemplified in Examples 9 to 12 below.




The preparation of compounds that feature a carboxamide at the 2 position of the pyrimidine core can be achieved as shown in Scheme 6, wherein a starting material bearing a 2-ethyl- and a 4-methylcarboxylate functionality (6-1) is employed. This strategy will allow the regioselective elaboration of the 4-methyl ester into the carboxamide by reaction with a suitable amine. The other ester bond in the 2 position can then be further elaborated. Scheme 6 is exemplified in Example 13 below.




Compounds of the present invention of formula 7-2 can be prepared by reaction of aldehydes or ketones 7-1 with suitable amines under reductive alkylation conditions, as shown in Scheme 7. Scheme 7 is exemplifed in Example 14 below.




In the processes for preparing compounds of the present invention set forth in the foregoing schemes and exemplified in the examples below, functional groups in various moieties and substituents may be sensitive or reactive under the reaction conditions employed and/or in the presence of the reagents employed. Such sensitivity/reactivity can interfere with the progress of the desired reaction to reduce the yield of the desired product, or possibly even preclude its formation. Accordingly, it may be necessary or desirable to protect sensitive or reactive groups on any of the molecules concerned. Protection can be achieved by means of conventional protecting groups, such as those described in Protective Groups in Organic Chemistry, ed. J. F. W. McOmie, Plenum Press, 1973 and in T. W. Greene & P. G. M. Wuts, Protective Groups in Organic Synthesis, John Wiley & Sons, 1991. The protecting groups can be removed at a convenient subsequent stage using methods known in the art. For example, in preparing the compounds of the invention it is sometimes necessary to protect one or more amino groups (e.g., amino groups present in substituents at the 2-position of the pyrimidinone ring) with, for example, a Boc or Cbz group or to protect hydroxy (e.g., the 5-hydroxy group on the pyrimidinone ring) with, for example, a benzoyl or benzyl group. The Boc group can be removed by acid treatment (e.g., TFA) either before or after formation of the final amide at C-6 of the pyrimidinone nucleus. The Cbz and benzyl groups are typically removed by catalytic hydrogenation or under strong acid conditions, either prior to or following formation of the final amide. The benzoyl group can be removed concurrently with the formation of the final amide. Examples 6 and 12 below illustrate the use of a Boc protective group and of Boc, benzoyl and benzyl protective groups in the preparation of compounds of the invention.




The preparation of compounds that feature a bis oxalamide at the 2 position of the pyrimidine core can be achieved as shown in Scheme 8, wherein a starting material bearing a basic nitrogen at the 2-position of the pyrimidine carboxyamide (8-1) is employed. This strategy will allow to obtain the final compound (8-3) following two possible procedures: by simple coupling of monoamide oxalic acid to the amine (8-1) or by the acylation of the basic nitrogen of (8-1) with dimethyl oxalate to give the ester intermediate (8-2) that is converted to the final compound by heating in presence of amine in appropriate solvent. Scheme 8 is exemplified in Examples 17, 18, and 20 below.
The following examples serve only to illustrate the invention and its practice. The examples are not to be construed as limitations on the scope or spirit of the invention.
EXAMPLE 1 
Methyl 5-(benzoyloxy)-2-[1-(tert-butoxycarbonyl)pyrrolidin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate




Step 1: Tert-butyl-2-[amino(hydroxyimino)methyl]pyrrolidine-1-carboxylate




A solution of hydroxylamine hydrochloride (1.0 eq.) in MeOH was added at 0° C. to a solution of KOH (1.0 eq.) in MeOH. The resulting reaction mixture was filtered and added to a solution of tert-butyl-2-cyanopyrrolidine-1-carboxylate (1.0 eq.) in methanol and stirred at 40° C. for 2 h. The solvent was removed in vacuo and the residue treated with water; the solid was filtered and washed with a mixture of Et2O: Petroleum Ether 1:1 to afford the title compound as a white solid as a mixture of rotamers by NMR.
1H-NMR (DMSO-d6, 400 MHz) δ 8.92 (s, 1H), 5.35 (s, 1H), 5.15 (s, 1H), 4.25 (bs, 0.5H), 4.10 (s, 0.5H), 3.40–3.30 (m, 1H), 2.10–1–70 (m, 4H), 1.40 (s, 4.5H), 1.35 (s, 4.5H), one signal is obscured by water.
Step 2: Methyl 5-(benzoyloxy)-2-[1-(tert-butoxycarbonyl)pyrrolidin-2-yl]-6-hydroxypyrimidine-4-carboxylate




A solution of the product of Step 1 (1.0 eq.) and dimethyl acetylenedicarboxylate (1.05 eq.) in CHCl3 was refluxed for 3 h. The reaction mixture was concentrated and the crude product was used directly in the next step without further purification. The crude product was dissolved in xylene and refluxed for 24 h. The solvent was removed in vacuo and the crude was dissolved in pyridine. Benzoic anhydride was added (1.5 eq.). The reaction mixture was stirred at room temperature until the starting material was consumed as determined by MS analysis. The reaction mixture was concentrated, and the resulting oil was diluted with ethyl acetate and washed with 1N HCl solutions saturated NaHCO3 solution, saturated NaCl solution. The crude oil obtained after organic solvent evaporation was purified by flash chromatography to obtain the title compound as a yellow solid.
1H-NMR (CDCl3, 400 MHz) δ 12.08 (bs, 1H), 8.18 (d, J=7.6 Hz, 2H), 7.64 (t, J=7.4 Hz, 1H), 7.50 (t, J=7.6 Hz, 2H), 4.80–4.60 (m, 1H), 3.82 (s, 3H), 3.60–3.50 (m, 1H), 3.40–3.20 (m, 1H), 2.50–2.10 (m, 2H), 2.00–1.70 (m, 2H), 1.50 (s, 9H).
MS m/z 444 (M+H)+.
Step 3: Methyl 5-(benzoyloxy)-2-[1-(tert-butoxycarbonyl)pyrrolidin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate
To a stirred solution of the product of Step 2 (1.0 eq.) in THF, Cs2CO3 was added (1.2 eq.) followed by the addition of CH3I (2.0 eq.). The reaction was stirred at 40° C. until the starting material was consumed as determined by MS analysis. The reaction was concentrated and the residue taken up with EtOAc, washed with 1 N HCl, saturated solution of NaHCO3 and brine. The organic phase was dried over anhydrous Na2SO4, filtered and concentrated. Reaction crude showed 3.4:1 ratio N (desired product) versus O methylation. The title product was purified by flash column chromatography (EtOAc: Petroleum Ether=1:1) and obtained as a 1: 1 mixture of rotamers by NMR.
1H-NMR (CDCl3, 400 MHz) δ 8.12 (d, J=7 Hz, 2H), 7.58 (t, J=7 Hz, 1H), 7.46 (t J=7 Hz, 2H), 4.97–4.95 (m, 0.5H), 4.87–4.83 (m, 0.5H), 3.74 (s, 1.5H), 3.72 (s, 1.5 H), 3.63 (s, 1.5H), 3.59 (s, 1.5H), 3.56–3.42 (m, 1H), 2.40–2.25 (m, 5H), 1.41 (s, 4.5 H), 1.25 (s, 4.5H).
MS m/z 458 (M+H)+.
Also obtained was the O-methylated compound of formula:




as a mixture of rotamers by NMR. 1H-NMR (CDCl3, 400 MHz) δ 8.21 (d, J=7.6 Hz, 2H), 7.72 (t, J=7.6 Hz, 1H), 7.56 (t, J=7.6 Hz, 2H), 5.10–5.05 (m, 0.3H), 5.00–4.95 (m, 0.7H), 4.01 (s, 3H), 3.87 (s, 3H), 3.80–3.60 (m, 2H), 2.50–2.40 (m, 1H), 2.15–2.00 (m, 2H), 2.00–1.85 (m, 1H), 1.61 (s, 2.7H), 1.40 (s, 6.3H).

MS m/z 458 (M+H)+.
EXAMPLE 2 
Benzyl 2-[5-(benzoyloxy)-4-(methoxycarbonyl)-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl]indoline-1-carboxylate




Step 1: Benzyl 2-[[hydroxy(methyl)amino](imino)methyl]indoline-1-carboxylate




1-Benzyloxycarbonyl-2-cyanoindoline was added to a solution of triethylamine (2 eq.) and MeNHOH.HCl (2 eq.) in EtOH. After stirring overnight the reaction mixture was evaporated, dissolved in EtOAc, washed with water, dried over Na2SO4 and evaporated to afford the title compound.
1H NMR (DMSO-d6, 340K, 300 MHz) δ 7.68 (d, J=8.0 Hz, 1H), 7.41–7.30 (m, 5 H), 7.19 (t, J=7.5 Hz, 2H), 6.99 (t, J=7.6 Hz, 1H), 5.53 (dd, J=5.5, 10.9 Hz, 1H), 5.22 (s, 2H), 3.62 (dd, J=11.0, 16.6 Hz, 1H), 3.33 (s, 3H), 3.01 (dd, J=5.5 Hz, 16.6 Hz, 1H).
MS m/z 326 (M+H)+.
Step 2: Benzyl 2-[5-(benzoyloxy)-4-(methoxycarbonyl)-1-methyl-6-oxo-1,6-dihydropyrimidi-2-yl]indoline-1-carboxylate
The product of Step 1 was dissolved in CHCl3 and dimethylacetylenedicarboxylate was added dropwise (1.2 eq.) at room temperature. After 4 h the mixture was evaporated, and the residue was dissolved in xylene and stirred at 160° C. for 2 days. The solvent was then evaporated, and the residue was dissolved in pyridine, after which (PhCO)2O (2 eq.) was added and the reaction mixture was stirred for 2 days. After evaporation, the resulting crude oil was diluted with EtOAc, washed with HCl 1N, dried over Na2SO4 and evaporated. The product was purified by flash chromatography on silica gel (EtOAc/petroleum ether, 1:4) to afford the title product.
1H NMR (DMSO-d6, 340 K, 400 MHz) δ 8.08 (d, J=7.3 Hz, 2H), 7.77 (t, J=7.4 Hz, 2H), 7.62 (t, J=7.6 Hz, 2H), 7.31–7.20 (m, 7H), 7.00 (t, J=7.3 Hz, 1H), 5.83 (dd, J=4.6 Hz, 11.0 Hz, 1H), 5.23–5.13 (m, 2H), 3.76 (dd, J=11.1, 16.6 Hz, 1H), 3.65 (s, 3H), 3.56 (s, 3H), 3.27 (dd, J=4.4 Hz, 16.6 Hz, 1H).
MS m/z 540 (M+H)+.
EXAMPLE 3 
N-(4-Fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4carboxamide




To a stirred solution of methyl 5-[(2,2-dimethylpropanoyl)oxy]-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4-carboxylate (prepared from 4-methylbenzonitrile by procedures similar to those set forth in Examples 2 or 3) in DMF 3 equivalents of 4-fluorobenzylamine were added and mixture was stirred at 90° C. for 2 h. The title product precipitated from the cooled reaction mixture after the addition of 2 N HCl, and was collected by filtration and washed with diethyl ether.
1H NMR (DMSO-d6, 400 MHz) δ 12.45 (s, 1H), 9.31 (bt, J=6.0 Hz, 1H), 7.62 (m, 2 H), 7.40–7.32 (m, 4H), 7.14 (t, J=8.8 Hz, 2H), 4.45 (d, J=6.0 Hz, 2H), 3.35 (s, 3 H), 2.48 (s, 3H).
MS m/z 368 (M+H)+.
EXAMPLE 4
N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: 4,5-Dihydroxy-6-(methoxycarbonyl)pyrimidine-2-carboxylic acid




2-Ethoxycarbonyl-4,5-Dihydroxy-6-(methoxycarbonyl)pyrimidine [obtained from ethyl amino(hydroxyimino)ethanoate (Branco, P. S. et al, Tetrahedron 1992, 40: 6335) by procedures similar to those set forth in Example 1] was suspended in dioxane/FHF 2:1 and 1N NaOH was added. After 20 min the mixture was acidified with 1N HCl solution, concentrated and filtered to give the title product.
1H-NMR (DMSO-d, 400 MHz) δ 13.10 (bs, 1H), 11.11 (bs, 1H), 3.82 (s, 3H).
MS m/z 213 (M−H)−.
Step 2: Methyl 5,6-dihydroxypyrimidine-4-carboxylate




A solution of the product of Step 1 in HCl 1N solution was stirred for 6 hours at 90° C. Reaction mixture was filtered and the solid washed with HCl 1N. Evaporation of the filtrate afforded the title product as a solid.
1H NMR (DMSO-d6, 300 K, 400 MHz) δ 7.75 (s, 1H), 3.82 (s, 3H). 13C NMR (DMSO-d6, 300 K, 400 MHz) δ 165.66, 158.20, 147.14, 139.00, 127.85, 52.16.
Step 3: Methyl 5-[(2,2-dimethylpropanoyl)oxy]-6-hydroxypyrimidine-4-carboxylate




Pivaloyl chloride 1.1 eq. was added to a solution of the product of Step 2 in pyridine, and the mixture was heated to 40° C. for 10 minutes. HPLC showed the complete conversion of starting material. The reaction mixture was concentrated, the resulting oil was diluted with ethyl acetate and washed with 1 N HCl solution. The title product was obtained as a brown solid after evaporation of the organic phase and trituration with diethyl ether.
1H NMR (DMSO-d6, 400 MHz) δ 13.35 (s, 1H), 8.18 (s, 1H), 3.85 (s, 3H), 1.28 (s, 9 H).
Step 4: Methyl 5-[(2,2-dimethylpropanoyl)oxy]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate




Dimethyl sulfate (1.5 eq.) was added to a solution of the product of Step 3 (1 eq.) in THF containing cesium carbonate (1.5 eq.). The reaction was carried out at 50° C. for thirty minutes. The solvent was evaporated and the resulting oil was dissolved in ethyl acetate, washed with 1N HCl solution. The crude title compound was recovered as yellow solid and used in the next step without purification.
1H NMR (DMSO-d6, 400 MHz) δ 8.43 (s, 1H), 3.81 (s, 3H), 3.45 (s, 3H), 1.30 (s, 9 H).
Step 5: N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
4-Fluorobenzylamine (3 eq.) was added to a solution of the crude product of Step 4 in DMF and the reaction mixture was heated to 90° C. for one hour. The title compound was obtained by RP-HPLC (C18, eluting with water and acetonitrile containing 0.1% TFA).
1H NMR (DMSO-d6, 400 MHz) δ 12.5 (s, 1H), 9.54 (t, J=6.2 Hz, 1H), 8.05 (s, 1H), 7.36 (dd, J=6.2, 8.4 Hz, 2H), 7.14 (t, J=8.4 Hz, 2H), 4.45 (d, J=6.2 Hz, 2H), 3.44 (s, 3H).
MS m/z 276 (M−H)−.
EXAMPLE 5 
N-(4-Fluorobenzyl)-5-hydroxy-1-methyl-2-[4-(morpholin-4-ylmethyl)phenyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: Methyl 2-[4-(bromomethyl)phenyl]-5-[(2,2-dimethylpropanoyl)oxy]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate




To a vigorously boiling solution of methyl 5-[(2,2-dimethylpropanoyl)oxy]-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4-carboxylate in carbon tetrachloride N-bromosuccinimide (1 eq.) and benzoyl peroxide (0.05 eq.) were added as dry powders. After 4 hr the mixture was allowed to reach room temperature and the precipitated succinimide was filtered off. The filtrate was evaporated under vacuum and the solid residue was used as such.
1H NMR (DMSO-d6, 400 MHz) δ 7.68–7.57 (m, 4H), 4.77 (s, 2H), 3.80 (s, 3H), 3.27 (s, 3H), 1.30 (s, 9H).
Step 2: N-(4-Fluorobenzyl)-5-hydroxy-1-methyl-2-[4-(morpholin-4-ylmethyl)phenyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide
A THF solution of methyl 2-[4-(bromomethyl)phenyl]-5-[(2,2-dimethylpropanoyl)oxy]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate was reacted with 4 eq. of morpholine for 0.5 h at room temperature. After evaporation of volatiles, the oily residue was taken into DMF and treated with 3 eq. of 4-fluorobenzylamine at 90° C. for 2 h. Title product was isolated as its trifluoroacetate salt by RP-HPLC (C18, water/acetonitrile with 1% of TFA as eluant).
1H-NMR (DMSO-d6, 400 MHz) δ 12.45 (s, 1H), 10 (bs, 1H), 9.31 (bt, 1H), 7.74 (m, 2H), 7.62 (m, 2H), 7.35 (m, 2H), 7.14 (t, J=8.8 Hz, 2H), 4.54–4.38 (m, 4H), 4.1–3.9 (m, 2H), 3.9–3.7 (m, 2H), 3.68–3.51 (m, 2H), 3.31 (s, 3H), 3.2–3.1 (m, 2H).
MS: m/z 453 (M+H)+.
EXAMPLE 6 
N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: 4-(tert-Butoxycarbonyl)morpholine-3-carboxylic acid




To a vigorously stirred solution of 3-morpholinecarboxylic acid and triethylamine (1.11 eq.) in MeOH (1.4 M) at 50° C. was added di-t-butyl dicarbonate (2 eq.). Stirring was continued at 50° C. for 5 min and at room temperature overnight. The reaction mixture was then concentrated to obtain an oily residue and suspended between EtOAc (500 ml) and saturated NaHCO3 (500 ml). The organic layer was extracted with saturated NaHCO3 (2×250 ml) and H2O (250 ml). Combined aqueous layers were brought to pH=2.0 with 3 M HCl and immediately extracted with EtOAc (2×500 ml). The combined organic layers were washed with dilute HCl, dried, filtered and evaporated to give the title compound as a pale yellow oil, a 1:1 mixture of rotamers by NMR.
1H NMR (400 MHz, DMSO-d6) 12.93 (bs, 1H), 4.32 (s, 0.5H), 4.29 (s, 0.5H), 4.2–4.1 (m, 1H), 3.83–3.74 (m, 1H), 3.58–3.52 (m, 2H), 3.36–3.31 (m, 1H), 3.16 (t, J=11.4 Hz, 0.5H), 3.00 (t, J=11.4 Hz, 0.5H), 1.40 (s, 4.5H), 1.36 (s, 4.5H).
MS m/z 232 (M+H)+.
Step 2: tert-Butyl 3-(aminocarbonyl)morpholine-4-carboxylate




To a stirred solution of the compound prepared in Step 1 (1 eq.), pyridine (0.6 eq.) and di-t-butyl dicarbonate (1.3 eq.) in dioxane (0.6 M), NH4HCO3 (1.26 eq.) was added and the mixture was stirred at room temperature for 20 hours. Mixture was concentrated, taken up in EtOAc and washed with water and brine. Organics were dried over Na2SO4 and evaporated giving the title product as an oil which crystallized at room temperature.
1H-NMR (DMSO-d6, 300 MHz) δ 7.35 (bs, 1H), 7.06 (bs, 1H), 4.15 (bs, 2H), 3.76 (bs, 1H), 3.57–3.51 (m, 2H), 3.28 (m, 1H), 3.18 (m, 1H), 1.36 (s, 9H).
MS m/z 231 (M+H)+.
Step 3: tert-Butyl 3-cyanomorpholine-4-carboxylate




A solution of the product of Step 2 (1 eq.) and triethylamine (2.1 eq.) in CH2Cl2 (0.1 M) was cooled to 0° C. and-trifluoroacetic anhydride (1.1 eq.) added dropwise under nitrogen. Stirring was continued 3.5 hours more at room temperature and volatiles removed in vacuo. Residues taken in EtOAc were washed with water, brine and dried over Na2SO4. Evaporation gave the title compound as a brown solid.
1H NMR (DMSO-d6, 400 MHz) δ 5.04 (d, J=2.7 Hz, 1H), 3.96 (d, J=12.2 Hz, 1H), 3.86 (dd, J=11.5, 2.6 Hz, 1H), 3.69 (d, J=12.4 Hz, 1H), 3.56 (dd, J=12.2, 3.2 Hz, 1 H), 3.40 (td, J=11.9, 2.89 Hz, 1H), 2.97 (m, 1H), 1.43 (s, 9H).
MS m/z 213 (M+H)+.
Step 4: tert-Butyl 3-[(Z)-amino(hydroxyimino)methyl]morpholine4-carboxylate




A solution of of the product of Step 3 (1 eq.), hydroxylamine hydrochloride (1.4 eq.) and triethylamine (1.7 eq.) in EtOH (0.5 M) was refluxed under nitrogen for 5 hours. Mixture was concentrated and residues taken up in EtOAc and washed with water and brine. Combined organics were dried over Na2SO4 and evaporated giving the title compound as a yellow solid.
1H NMR (DMSO-d6, 400 MHz) δ 9.16 (bs, 1H), 5.32 (bs, 2H), 4.30 (bs, 1H), 4.08 (d, J=11.6 Hz, 1H), 3.75 (d, J=6.8 Hz, 1H), 3.50–3.33 (m, 4H), 1.38 (s, 9H).
MS: m/z 246 (M+H)+.
Step 5: Dimethyl-2-({2-amino-2-[4-(tert-butoxycarbonyl)morpholin-3-yl]ethenyl}oxy)but-2-enedioate




A solution of the product of Step 4 (1 eq.) and dimethylacetylenedicarboxylate (1.2 eq.) in CHCl3 was refluxed for 1 hour under nitrogen and solution concentrated. Residue was purified by flash chromatography on silica gel, eluents petroleum ether/EtOAc 7:3→1:1, to give the desired product as a mixture of two isomers E/Z (76:14).
1H NMR (DMSO-d6, 400 MHz, 300K) δ 6.60 and 6.20 (2 bs, 2H), 5.58 and 5.41 (2s, 1H), 4.36 (bs, 1H), 4.04 (bs, 1H), 3.8 (bs, 1H), 3.76 and 3.72 (2 s, 3H), 3.63 and 3.58 (2 s, 3H), 3.53 (td, J=13.6, 3.7 Hz, 1H), 3.44 (t, J=10.4 Hz, 1H), 3.31 (m, 2 H), (s, 9H).
MS m/z 388 (M+H)+.
Step 6: tert-Butyl-3-[4,5-dihydroxy-6-(methoxycarbonyl)pyrimidin-2-yl]morpholine-4-carboxylate




The adducts of Step 5 were refluxed in xylenes for 24 hours. Then the reaction was cooled down and concentrated in vacuo. Ethyl ether was added until precipitation of a solid that was filtered, washed with ethyl ether and dried to give the title pyrimidine as an orange solid.
1H NMR (DMSO-d6, 400 MHz, 340 K) δ 4.62 (s, 1H), 4.15 (d, J=12 Hz, 1H), 3.84 (bs, 1H), 3.82 (s, 3H), 3.70 (dd, J=12.3, 4 Hz, 1H), 3.61 (dd, J=12.2, 3.8 Hz, 1H), 3.56 (t, J=13 Hz, 1H), 3.43 (td, J=11.5, 3.4 Hz, 1H), 1.35 (s, 9H).
MS m/z 356 (M+H)+.
Step 7: tert-Butyl-3-[5-(benzoyloxy)-4-hydroxy-6-(methoxycarbonyl)pyrimidin-2-yl]morpholine-4-carboxylate




The pyrimidine from Step 6 in dry pyridine (0.2 M), was treated with benzoic anhydride (2 eq.) overnight at room temperature. The mixture was evaporated, taken in EtOAc and washed with HCl 1N, NaHCO3 and brine. Organics were dried over Na2SO4, and filtered, evaporated and purified by flash chromatography on silica gel, eluents EtOAc/Petroleum Ether: 7/3.
1H NMR (DMSO-d6, 300 MHz, 340K) δ 13.3 (bs, 1H), 8.07 (d, J=7.5 Hz, 2H), 7.76 (t, J=7.5 Hz, 1H), 7.61 (t, J=7.5 Hz, 2H), 4.73 (s, 1H), 4.22 (d, J=12.4 Hz, 1H), 3.86 (d, J=11.0 Hz, 1H), 3.78 (dd, J=12.4, 3.9 Hz, 1H), 3.73 (s, 3H), 3.58 (t, J=13.9 Hz, 2H), 3.47 (td, J=10.7, 3.6, 1H), 1.36 (s; 9H).
MS m/z 600 (M+H)+.
Step 8: Alkylated derivatives 8A and 8B




The pyrimidine product of Step 7 in dry THF (0.6 M) was treated with cesium carbonate (1.5 eq.) and dimethyl sulfate (1.5 eq.) at 50° C. for 1 hour. Solvent was removed in vacuo and residue taken in EtOAc, washed with HCl IN and brine. Organics were dried over Na2SO4, filtered and evaporated to obtain a crude which was purified by flash chromatography on silica gel, (eluents EtOAc/Petroleum Ether: 3/7) to separate the two compounds 8A and 8B (ratio 8A/8B 1/0.85).
An alternative route was also employed as follows: The pyrimidine product of Step 7 was added to a suspension of LiH (1.1 eq) in dioxane at room temperature. The mixture was aged 45 min at 38° C. and was then cooled to room temperature. Dimethylsulfate (1.3 eq) was added and the mixture was warmed to 38° C. (4h) and 56° C. (4h). The reaction mixture was cooled to 16° C. and glacial acetic acid (0.1 eq) was added, followed by water and EtOAc. The aqueous layer was separated and extracted with EtOAc. The combined organic layer was dried (Na2SO4) and concentrated to an oil, which was chromatographed through silica gel, eluting with 50–55% EtOAc/hexanes to separated compound 8A from 8B. The fractions were evaporated to a foamy solid. This solid was dissolved in ether and re-evaporated to foamy solid that could be scraped out easily. This solid was dried in a vacuum oven overnight at 40° C. to afford 8B as a pale yellow solid. The ratio of 8A/8B is variable with this route, from 1:4 to 1:12.
tert-Butyl-3-[5-(benzoyloxy)-4-methoxy-6-(methoxycarbonyl)pyrimidin-2-yl]morpholine-4-carboxylate (8A)
1NMR (300 MHz, DMSO-d6+TFA, 330K) δ 8.10 (d, J=7.9 Hz, 2H), 7.77 (t, J=7.3 Hz, 1H), 7.61 (t, J=7.4 Hz, 2H), 4.94 (bs, 1H), 4.50 (d, J=1 1.6 Hz, 1H), 4.0 (s, 3H), 3.85–3.81 (m, 2H), 3.76 (s, 3H), 3.66 (d, J=10.4 Hz, 1H), 3.49–3.45 (m, 2H), 1.35 (bs, 9H).
MS m/z 474 (M+H)+.
tert-Butyl-3-[5-(benzoyloxy)-4-(methoxycarbonyl)-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl]morpholine-4-carboxylate (8B)
1H NMR (DMSO-d6, 400 MHz, 330K,) δ 8.09 (d, J=7.3 Hz, 2H), 7.77 (t, J=7.5 Hz, 1H), 7.62 (t, J=7.8 Hz, 2H), 5.08 (d, J=3.4 Hz, 1H), 4.21 (d, J=12.3 Hz, 1 H), 3.95–3.85 (m, 3H), 3.76 (s, 3H), 3.58 (s, 3H), 3.55–3.50 (m, 2H), 1.34 (s, 9H).
MS m/z 474 (M+H)+.
Step 9: tert-Butyl-3-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl]-morpholine-4-carboxylate




The methyl ester 8B in dry MeOH was treated with 4-fluorobenzylamine (2.5 eq.) at reflux for 2 hours. Solvent was removed in vacuo and residue triturated with Et2O to obtain the title product.
1H NMR (300 MHz, DMSO-d6, 320K) δ 11.95 (bs, 1H), 8.32 (t, J=6.0 Hz, 1H), 7.39–7.35 (m, 2H), 7.19–7.13 (m, 2H), 4.96 (dd, J=4.25, 2.42 Hz, 1H), 4.62 (dd, J=14.9, 6.95 Hz, 1H), 4.49 (dd, J=14.9, 5.83 Hz, 1H), 4.16 (dd, J=12.2, 2.0 Hz, 1H), 3.87–3.79 (m, 2H), 3.70–3.64 (m, 1H), 3.55–3.45 (m, 5H), 1.23 (s, 9H).
MS m/z 463 (M+H)+.
Step 10: N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-morpholin-3-yl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




The compound from Step 9 was treated with a mixture of dichloromethane/TFA (2/1) for 1 hour at room temperature. Organics were removed in vacuo to give the title compound as a solid.
1H NMR (300 MHz, DMSO-d6, 300 K) δ 9.45 (bs, 1H), 7.39–7.36 (m, 2H), 7.19–7.15 (m, 2H), 4.93 (d, J=9.2 Hz, 1H), 4.64 (dd, J=15.4, 6.7 Hz, 1H), 4.55 (dd, J=15.4, 6.2 Hz, 1H), 4.35 (d, J=12.8 Hz, 1H), 4.08 (d, J=12.6 Hz, 1H), 3.77 (t, J=12.4 Hz, 1H), 3.55 (s, 3H), 3.55–3.46 (m, 2H), 3.40–3.34 (m, 1H).
MS m/z 363 (M+H)+.
Step 11: N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide
The compound from Step 10 was dissolved in MeOH and treated with triethylamine (1 eq.), sodium acetate (1.6 eq.), formaldehyde 37% w/w aq. soln. (3 eq.), and sodium cyanoborohydride (1.43 eq.). The mixture was left stirring at room temperature for 1 hour. The reaction mixture was concentrated and the title compound was obtained by RP-HPLC purification (C18, eluting with water and acetonitrile containing 0.1% TFA), as its trifluoroacetate salt.
1H NMR (400 MHz, DMSO-d6+TFA) δ 12.33 (bs, 1H), 10.05 (bs, 1H), 9.48 (t, J=6.4 Hz, 1H), 7.35–7.33 (m, 2H), 7.15–7.12 (m, 2H), 4.98 (d, J=8.8 Hz, 1H), 4.57 (d, J=6.4 Hz, 2H), 4.36 (d, J=12.7 Hz, 1H), 4.13 (d, J=12.4 Hz, 1H), 3.77 (t, J=12.5 Hz, 1H), 3.69 (d, J=12.8 Hz, 1H), 3.54 (s, 3H), 3.48–3.41 (m, 2H), 2.83 (s, 3 H).
MS m/z 377 (M+H)+.
N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylmorpholin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide has been resolved into its enantiomers by semi preparative chiral HPLC using the following conditions:

    
    
        Solvents: a mixture of 1:1 0.2% TFA in Hexanes: EtOH
        Column: chiralpak AS column, 250×46 mm at 1.0 ml/min, collected by absorbtion at 260 nM
    
    


The first eluate is the (+) enatiomer (MeOH, c=0.24, 25C): [α]D=(+) 55.42.
The second eluate is the (−) enantiomer (MeOH, c=0.215, 25C) [α]D=(−) 51.63.
EXAMPLE 7
2-(4-ethyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: Methyl 1-methyl-2-(4-tert-butoxycarbonylpiperazin-2-yl))-5-benzoyloxy-6-oxo-1,6-dihydropyrimidine-4-carboxylate




Methyl 1-methyl-2-(4-tert-butoxycarbonyl-1-benzyloxycarbonylpiperazin-2-yl))-5-benzoyloxy-6-oxo-1,6-dihydropyrimidine-4-carboxylate (prepared from 1-[(benzyloxy)carbonyl]-4-(tert-butoxycarbonyl)piperazine-2-carboxylic acid (Bigge et al, Tetrahedron Lett. 1989, 30: 5193) by procedures similar to those set forth in Examples 2 or 3 in combination with a deprotection step) was dissolved in MeOH and hydrogenated at atm pressure on 10% Pd/C for 1 hour. The crude title product was obtained after filtration and evaporation.
Step 2: N-(4-fluorobenzyl) 1-methyl-2-(4-tert-butoxycarbonylpiperazin-2-yl))-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamide




The crude product from Step 1 was dissolved in MeOH and 4-fluorobenzylamine (3.5 eq.) added. After being refluxed overnight, the precipitate was filtered and washed with Et2O to afford the title product.
Step 3: N-(4-fluorobenzyl) 1-methyl-2-(4-tert-butoxycarbonyl-1-methylpiperazin-2-yl))-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamide




The solid product from Step 2 was dissolved in MeOH and NaCNBH3 (1.4 eq.), AcONa (1.6 eq.), HCHO 37% (1 eq.) were added. The reaction mixture was stirred at room temperature for 2 days, and then evaporated to afford the crude title product.
1H NMR (DMSOd6+TFA, 340K, 400 MHz) δ 7.40–7.35 (m, 2H), 7.18–7.10 (m, 2H), 4.83 (d, J=7.3 Hz, 1H), 4.59 (d, J=6.3 Hz, 2H), 4.41 (d, J=14.9 Hz, 1H), 4.20–4.10 (m, 1H), 3.75–3.60 (m, 1H), 3.54 (s, 3H), 3.38–3.25 (m, 2H), 3.15–3.05 (m, 1H), 2.85 (s, 3H), 1.45 (s, 9H). MS (EI+) m/z=476 (M+H)+.
Step 4: N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methylpiperazin-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide




The crude product from Step 3 was stirred in CH2Cl2/TFA (1:1) for 2 hours to remove the Boc protective group from the piperazinyl nitrogen.
1H NMR (DMSOd6, 340K, 400 MHz) δ 12.25 (bs, 1H), 9.03 (bs, 1H), 7.42–7.35 (m, 2H), 7.20–7.10 (m, 2H), 4.62–4.45 (m, 2H), 4.14–4.09 (m, 1H), 3.62 (s, 3H), 3.62–3.52 (m, 1H), 3.48–3.32 (m, 1H), 3.25–3.15 (m, 1H), 3.15–3.05 (m, 2H), 2.44–2.32 (m, 1H), 2.34 (s, 3H).
MS (EI+) m/z=376 (M+H)+.
Step 5: 2-(4-ethyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
Triethylamine (2 eq.), NaCNBH3 (1.4 eq.), AcONa (1.6 eq.) and CH3CHO (1 eq.) were added to a methanolic solution of the crude product obtained in step 4. The reaction was stirred at room temperature for 1 hour. The title product was obtained as its trifluroacetate salt by preparative RP-HPLC purification (C18, gradient of CH3CN/H2O+0.01% TFA).
1H NMR (DMSO-d6+TFA, 300 MHz) δ 9.40 (t, J=5.9 Hz, 1H), 7.34 (t, J=8.02 Hz, 2H), 7.14 (t, J=8.7 Hz, 2H), 5.00 (d, J=9.9 Hz, 1H), 4.54 (d, J=6.1 Hz, 2H), 4.04–3.82 (m, 3H), 3.55–3.43 (m, 4H), 3.30–3.22 (m, 4H), 2.87 (s, 3H), 1.21 (t, J=7.14 Hz, 3H).
MS m/z 404 (M+H)+.
EXAMPLE 7B
Step 1: N-(4-fluorobenzyl)-5-hydroxy-2-[4-(isopropylsulfonyl)-1-methylpiperazin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




4-fluorobenzyl 2-(1,2-dimethylpiperazin-2-yl) -5-hydroxy-1-methyl -6-oxo-1,6-dihydropyrimidine-4-carboxylate, obtained during the preparation of the compound in example 7 step 4, was dissolved in THF/NaOH 2N (1:1) followed by the addition of iPrSO2Cl (4 eq). After being stirred at room temperature overnight, further addition of iPrSO2Cl (2.4 eq) and NaOH 2N (2.4 eq) were made to complete the reaction. After 3 hours NaOH 2N (10 eq) was added and the reaction mixture was stirred for 10 minutes at room temperature. The title product was isolated by preparative HPLC (Column C18, gradient of CH3CN/H2O+0.01% TFA).
1H NMR (DMSOd6+TFA, 300K, 300 MHz) δ 9.48 (bt, J=6.5 Hz,l H), 7.39–7.35 (m, 2H), 7.7.22–7.12 (m, 2H), 4.96 (d, J=8.4 Hz, 1H), 4.57 (d, J=6.3 Hz, 2H), 4.23 (d, J=14.4 Hz, 1H), 3.96 (d, J=10.8 Hz, 1H), 3.76 (d, J=10.2 Hz, 1H), 3.53 (s, 3H), 3.50–3.35 (m, 3H), 3.23–3.15 (m, 1H), 2.87 (s, 3H), 1.25 (d, J=6.9 Hz, 6H).
MS: m/z 482 (M+H)+.
EXAMPLE 8 
N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methylpiperidin-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Methyl 5-(benzoyloxy)-1-methyl-6-oxo-2-piperidin-2-yl-1,6-dihydropyrimidine-4-carboxylate (prepared from 1-(benzyloxycarbonyl)piperidine-2-carboxylic acid by procedures similar to those set forth in Examples 1 or 2 in combination with a deprotection step) was suspended in TiF and treated with 3 eq. of triethylamine and 3 eq. of methyl iodide at 40° C. After stirring for 5 h, THF was evaporated and residue poured into EtOAc and washed with brine. Organic phase was dried (Na2SO4), filtered and concentrated under reduced pressure. The oily residue was taken into EtOAc and treated with 3 eq. of 4-fluorobenzylamine at 90° C. for 0.5 h. The title product was isolated as its trifluoroacetic salt by preparative RP-HPLC (C18, 5 μM, acetonitrile/water containing 0.1% TFA as eluant).
1H NMR (DMSO-d6, 400 MHz) δ 12.28 (bs, 1H), 9.50 (bt, 1H), 9.31 (bs, 1H), 7.37 (dd, J=5.6 Hz, 8.4 Hz, 2H), 7.18 (t, J=8.8 Hz, 2H), 4.8–4.6 (m, 1H), 4.57 (d, J=6.4 Hz, 2H), 3.70–3.60 (m, 1H), 3.50 (s, 3H), 3.4–3.3 (m, 1H), 2.78 (bs, 3H), 2.4–2.3 (m, 1H), 1.92–1.46 (m, 5H).
MS m/z 375 (M+H)+.
EXAMPLE 9
2-(1-Acetylpyrrolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: Methyl 5-(benzoyloxy)-1-methyl-6-oxo-2-pyrrolidin-2-yl-1,6-dihydropyrimidine-4-carboxylate




Methyl-5-(benzoyloxy)-2-[1-(tert-butoxycarbonyl)pyrrolidin-2-yl]-6-hydroxypyrimidine-4-carboxylate was treated with TFA:CH2Cl2 (3:7) at 0° C. The solution was warmed to room temperature and the progress of the reaction was monitored by MS analysis. After 1 h the reaction was complete and the solvent was removed under reduced pressure using a rotatory evaporator. The title product was precipitated with Et2O and collected by filtration.
1H-NMR (CDCl3, 400 MHz) δ 8.17 (d, J=7.4 Hz, 2H), 7.67 (t, J=7.6 Hz, 1H), 7.52 (t, J=7.6 Hz, 2H), 5.45 (dd, J=7.6, 6.7 Hz, 1H), 3.82 (s, 3H), 3.66 (s, 3H), 3.61 (t, J=7.0 Hz, 2H), 2.78–2.69 (m, 1H), 2.40–2.00 (m, 3H).
MS m/z 358 (M+H)+.
Step 2: 2-(1-Acetylpyrrolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
To a stirred solution of the product of Step 1 (1.0 eq.) in CHCl3, triethylamine (3.0 eq.) was added followed by the addition of acetyl chloride (1.5 eq.). The reaction was stirred at room temperature until the starting material was consumed as determined by MS analysis. The reaction mixture was concentrated and the crude product was used directly in the subsequent step without further purification. A solution of the crude product from above (1.0 eq.) in NMP was treated with 4-fluorobenzylamine (2.0 eq.). The solution was stirred at reflux until the reactants were consumed as determined by MS analysis. The title compound was obtained by RP-HPLC purification (C18, eluting with water and acetonitrile containing 0.1% trifluoroacetic acid) as a 4:1 mixture of rotamers by NMR.
1H-NMR (DMSO-d6, 400 MHz) δ 12.11 (bs, 1H), 8.49 (t, J=6.2 Hz, 0.8H), 8.30 (t, J=6.2 Hz, 0.2H), 7.4–7.3 (m, 2H), 7.15 (t, J=8.8 Hz, 2H), 5.22 (dd, J=8.0, 3.2 Hz, 0.2H), 5.02 (dd, J=8.0, 3.2 Hz, 0.8H), 4.60–4.47 (m, 2H), 3.95–3.85 (m, 0.8H), 3.80–3.70 (m, 0.2H), 3.59–3.57 (m, 0.8H), 3.55 (s, 2.4H), 3.52 (s, 0.6H), 3.34-3.37 (m, 0.2H), 2.40–1.7 (m, 4H), 2.5 (s, 2.4H), 1.75 (s, 0.8H).
MS m/z 389 (M+H)+.
EXAMPLE 10
2-(1-benzoyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: Methyl 2-(2,3-dihydro-1H-indol-2-yl)-1-methyl-5-benzoyloxy-6-oxo-1,6-dihydropyrimidine-4-carboxylate




Benzyl 2-[5-(benzoyloxy)-4-(methoxycarbonyl)-1-methyl-6-oxo-1,6-dihydropyrimidi-2-yl]indoline-1-carboxylate was dissolved in EtOAc and hydrogenated at atmospheric pressure on 10% Pd/C overnight. The crude title product was obtained after filtration and evaporation
Step 2: Methyl 2-(1-benzoyl-2,3-dihydro-1H-indol-2-yl)-5-benzoyloxy 1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate




THF was added to the crude product of Step 1, followed by pyridine (2 eq.) and PhCOCl (1 eq.). After being stirred at room temperature overnight, the reaction mixture was evaporated to give the crude title product.
Step 3: 2-(1-benzoyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
The crude product of Step 2 was dissolved in MeOH and 4-fluorobenzylamine (3.5 eq.) added. The solution was stirred at 60° C. over night. The title product was obtained by preparative RP-HPLC (C18, gradient of CH3CN/H2O+0.01% TFA).
1H NMR (DMSO-d6+TFA, 340 K, 400 MHz) δ 7.75–7.80 (m, 1H), 7.45–6.97 (m, 13 H), 5.77 (dd, J=10, 3.6 Hz, 1H), 4.35–4.50 (m, 2H), 3.72 (dd, J=16, 10 Hz, 1H), 3.35 (s, 3H), 3.16 (dd, J=16, 3.6 Hz, 1H).
MS m/z 499 (M+H)+.
EXAMPLE 11 
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




Step 1: Methyl 2-(1,2,3,4-tetrahydroquinolin-2-yl)-1-methyl-5-benzoyloxy-6-oxo-1,6-dihydropyrimidine-4-carboxylate




Benzyl 2-[5-(benzoyloxy)-4-(methoxycarbonyl)-1-methyl-6-oxo-1,6-dihydropyrimidi-2-yl]-1,2,3,4-tetrahydroquinoline-1-carboxylate (prepared from tetrahydroquinoline-2-carboxylic acid (Robl et al, Tetrahedron Letters 1995, 36: 1593) by protection of the nitrogen and following procedures similar to those set forth in Examples 1 or 2 in combination with a deprotection step) was dissolved in EtOAc and hydrogenated at atmospheric pressure on 10% Pd/C at room temperature overnight. The title product was obtained as the residue after filtration and evaporation of the organic solvent.
Step 2: Methyl 5-benzoyloxy-1-methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)-1,2,3,4-tetrahydroquinolin-2-yl]-1,6-dihydropyrimidine-4-carboxylate




The residue of Step 1 was dissolved in dichloromethane. Pyridine, picolinoyl chloride hydrochloride and a catalytic amount of DMAP were added. A further addition of the reactants was made after two hours. After evaporation of the solvent, the residue was diluted with EtOAc, the organic phase washed with water, dried (Na2SO4) and evaporated to afford the title product.
Step 3: 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
The residue of Step 2 was dissolved in DMF and 4-fluorobenzylamine (3 eq.) was added. The reaction mixture was stirred at 90° C. for 1 h. The title compound was purified by preparative HPLC and isolated as its trifluoroacetic salt (C18, gradient of CH3CN/H2O+0.01% TFA).
1H-NMR (DMSO-d6+TFA, 400 MHz, 340 K) δ 8.35 (d, J=4.2 Hz, 1H), 7.81 (t, J=7.4 Hz, 1H), 7.54 (bt, 1 H), 7.49 (d, J=7.7 Hz, 1H), 7.37 (dd, J=5.2 Hz, 7.0 Hz, 1 H), 7.25–7.22 (m, 2H), 7.17–7.09 (m, 3H), 6.90 (t, J=7.3 Hz, 1H), 6.62 (t, J=7.3 Hz, 1H), 6.43 (bs, 1H), 5.74 (t, J=7.6 Hz, 1H), 4.42 (dd, J=6.4 Hz, 14.8 Hz,1H), 4.32 (dd, J=6.4 Hz, 14.8 Hz, 1H), 3.65 (s, 3H), 2.80–2.70 (m, 3H), 1.85–1.75 (m, 1 H).
MS m/z 514 (M+H)+.
EXAMPLE 12
2-[(2S,4R)-1-benzoyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: Methyl 2-[(2S,4R)-1-benzoyl-4-(benzyloxy)pyrrolidin-2-yl]-5-(benzoyloxy)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate




Methyl 2-[(2S,4R)-1-tert-butyloxycarbonyl-4-(benzyloxy)pyrrolidin-2-yl]-5-(benzoyloxy)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate [obtained from N-Boc-O-benzyl-L-hydroxyproline using chemistry similar to those set forth in Examples 1 or 2; the stereochemistry of products of Steps 1 to 3 is based on that of starting material] was dissolved in dichloromethane (0.03 M), followed by addition of an excess of TFA. The mixture was stirred at room temperature for 1 hour. The solvent was evaporated in vacuo. To the residue dissolved in pyridine, benzoic anhydride (2 eq.) was added. The mixture was stirred at room temperature for 5 hours. Pyridine was evaporated in vacuo and the residue dissolved in EtOAc was washed with HCl (1M), saturated aqueous NaHCO3 and brine, dried on Na2SO4, filtered and evaporated in vacuo to give the title product as a yellow solid.
1H NMR (DMSO-d6, 400 MHz, 330 K) δ 8.07 (d, J=7.6 Hz, 2H), 7.77 (t, J=7.3 Hz, H), 7.62 (t, J=7.74 Hz, 2H), 7.52–7.49 (m, 5H), 7.33–7.30 (m, 5H), 5.47 (bt, 1H), 4.53 (d, J=12.1 Hz, 1H), 4.44 (d, J=12.0 Hz, 1H), 4.36 (bs, 1H), 3.87–3.84 (m, 1H), 3.76 (s, 3H), 3.73 (s, 3H), 3.57 (d, J=11.2 Hz, 1H) 2.70 (t, J=12.2 Hz, 1H), 2.31–2.28 (m, 1H).
Step 2: 2-[(2S,4R)-1-benzoyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




The compound of Step 1 was dissolved in methanol and 4-fluorobenzylamine (5 eq.) was added. The mixture was refluxed overnight. After cooling, the reaction mixture was filtered and washed with ethyl ether to obtain the title product as a white solid.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 12.15 (s, 1H), 9.00 (br t, 1H), 7.48 (d, J=7.6 Hz, 2H) 7.41–7.20 (m, 10H), 7.12 (t, J=8.8 Hz, 2H), 5.27 (t, J=8 Hz, 1H), 4.63 (dd, J=14.9, 7.3 Hz, 1H), 4.56–4.38 (m, 2H), 4.26 (bs, 1H) 4.25 (d, J=11.4 Hz, 2H) 3.68 (s, 3H), 3.52 (d, J=11.2 Hz, 1H), 2.66–2.63 (m, 1H), 2.26–2.20 (m, 1H).
MS m/z 557 (M+H)+.
Step 3: 2-[(2S,4R)-1-benzoyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
The title compound of Step 2 was dissolved in AcOH and 10% Pd/C (10% weight) was added. The mixture was stirred under H2 at atmosphere overnight. Pd/C was filtered, AcOH evaporated in vacuo, and the resulting title compound was washed with methanol.
1H NMR (DMSO-d6, 400 MHz) δ 12.1 (s, 1H), 9 (bt, 1H), 7.51–7.47 (m, 3H), 7.41–7.33 (m, 4H) 7.11 (t, J=8.8 Hz, 2H), 5.27 (t, J=8 Hz, 1H), 5.08 (d, J=3.2 Hz, 1H), 4.63 (dd, J=14.8 Hz, 7.3 Hz, 1H), 4.43–4.39 (m, 2H), 4.20 (d, J=7.4 Hz, 1H), 3.67 (s, 3H), 2.41–2.36 (m, 1H), 2.2–2.1 (m, 1H).
MS m/z 467 (M+H)+.
EXAMPLE 13 
N4-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-N2-(pyridin-2-ylmethyl)-1,6-dihydropyrimidine-2,4-dicarboxamide




2-Ethyl 4-methyl 5-[(2,2-dimethylpropanoyl)oxy]-1-methyl-6-oxo-1,6-dihydropyrimidine-2,4-dicarboxylate (made by protection and alkylation of the starting material of Example 4, Step 1 using procedures similar to those set forth in Examples 1 or 2) was dissolved in DMF, 4-fluorobenzylamine (3.1 eq.) was added and the mixture was stirred at 90° C. overnight. After concentration of the solvent, the residue was taken into EtOAc, washed with 1 N HCl, dried over Na2SO4 and evaporated to obtain crude N-(4-fluorobenzyl)-2-ethoxycarbonyl-1-methyl-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamide. To this crude product was added 2-picolylamine (8 eq.), and the reaction was stirred at 90° C. overnight. The title product was obtained as its trifluoroacetic salt by preparative RP-HPLC purification (C18 gradient of CH3CN/H2O+0.01% TFA).
1H NMR (DMSO-d6, 300K, 400 MHz) δ 12.70 (bs, 1H), 9.75–9.65 (m, 2H), 8.56 (d, J=4.4 Hz, 1H), 7.90–7.80 (m, 1H), 7.44 (d, J=8.0 Hz, 1H), 7.40–7.35 (m, 3H), 7.17 (t, J=9.2, 2H), 4.60 (d, J=6.0 Hz, 2H), 4.54 (d, J=6.0 Hz, 2H), 3.67 (s, 3H).
MS m/z 412 (M+H)+.
EXAMPLE 14
2-[2-(4-benzoylpiperazin-1-yl)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: 2-(2,2-dimethoxyethyl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Methyl 2-(2,2-dimethoxyethyl)-5-benzoyloxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate (1.0 eq.) (prepared from 3,3-dimethoxypropionitrile by procedure similar to those set forth in Examples 1 or 2) in dry MeOH was treated with 4-fluorobenzyl amine (2.5 eq.) at reflux for 2 hours. Solvent was removed in vacuo and residue triturated with Et2O to obtain the title product.
1H NMR (DMSO-d6, 300K, 400 MHz) δ: 9.80 (br s, 1H), 7.41–7.38 (m, 2H), 7.15 (t, J=8.7 Hz, 2H), 5.04 (br s, 1H), 4.47 (d, J=6.2 Hz, 2H), 3.46 (s, 3H), 3.28 (s, 6H), 3.01 (d, J=5.5 Hz, 2H).
MS: m/z 366 (M−H)+
Step 2: N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-(2-oxoethyl)-1,6-dihydropyrimidine-4-carboxamide




The product of Step 1 was treated with a mixture HCl 1N/THF for 1 hour at 40° C. Organics were removed in vacuo and residue extracted in DCM, dried over Na2SO4 and concentrated to give the title compound as a foam which was immediately reacted in the following reductive amination.
MS: m/z 320 (M+H)+.
Step 3: 2-[2-(4-benzoylpiperazin-1-yl)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxamide
The product of Step 2 was dissolved in MeOH and treated with sodium acetate (1.6 eq.), 1-benzoylpiperazine (2 eq.), and sodium cyanoborohydride (1.43 eq.). The mixture was left stirring at room temperature-for 1 hour. The reaction mixture was concentrated and the title compound was obtained by RP-HPLC purification (C18, eluting with water and acetonitrile containing 0.1% TFA).
1H NMR (CDCl3+TFA, 273 K, 600 MHz) δ: 10.431 (br s, 1H), 8.38 (t, J=5.7 Hz, 1H), 7.61 (t, J=6.4 Hz, 1H), 7.52 (t, J=7.7 Hz, 2H), 7.41 (d, J=7.4 Hz, 2H), 7.28 (2H, overlapped by CHCl3), 7.07 (t, J=8.5 Hz, 2H), 4.97 (d, J=14 Hz, 1H), 4.63 (d, J=5.7 Hz, 2H), 4.10 (d, J=14 Hz, 1H), 3.93 (d, J=11.9 Hz, 1H), 3.82–3.74 (m, 4H), 3.61 (s, 3H), 3.47 (t, J=12.6 Hz, 1H), 3.41 (br s, 2H), 3.29–3–26 (m, 1H), 3.15–3.14 (m, 1H).
MS: m/z 494 (M+H)+.
EXAMPLE 15 
N-(4-fluorobenzyl)-5-hydroxy-1-(2-hydroxy-3-morpholin-4-ylpropyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: Methyl 1-allyl-5-[(2,2-dimethylpropanoyl)oxy]-6-oxo-1,6-dihydropyrimidine-4-carboxylate




Methyl 5-[(2,2-dimethylpropanoyl)oxy]-6-hydroxy-1,6-dihydropyrimidine-4-carboxylate (see Example 4, Step 3) was dissolved in THF, then allyl bromide (2 eq.) and Cs2CO3 (2 eq.) were added. The reaction mixture was refluxed for 2 h, then evaporated. The residue was diluted with EtOAc, washed with 1N HCl, dried (Na2SO4) and the solvent evaporated. The product was-purified by flash chromatography on silica gel eluting with a gradient of petroleum ether/EtOAc.
1H-NMR-(DMSO-d6, 400 MHz, 300K) δ 8.47 (s, 1H), 5.99–5.92 (m, 1H), 5.25–5.14 (m, 2H), 4.58 (d, J=5.5 Hz, 2H), 3.82 (s, 3H), 1.28 (s, 9H).
Step 2: N-(4-fluorobenzyl)-5-hydroxy-1-(2-hydroxy-3-morpholin4-ylpropyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide
2a. The compound of Step 1 was dissolved in dichloroethane and m-CPBA was added (5 eq.). The reaction mixture was refluxed until the starting material was completely consumed, then evaporated. MS m/z 311 (M+H)+.
2b. Crude material from step 2a was dissolved in MeOH and morpholine (6 eq.) was added. The reaction mixture was refluxed for 3 h, then evaporated. MS (EI+) m/z 398 (M+H)+.
2c. Crude material from step 2b was dissolved in DMF and 4-fluorobenzylamine (3 eq.) was added. The reaction mixture was stirred at 90° C. for 3 h. The title compound was obtained as its trifluoroacetate salt by RP-HPLC purification (gradient of CH3CN/H2O+0.01% TFA).
1H-NMR (DMSO-d6+TFA, 400 MHz, 340K) δ 9.27 (bt, 1H), 7.94 (s, 1H), 7.40–7.36 (m, 2H), 7.15–7.11 (m, 2H), 4.48 (d, J=6.4 Hz, 2H), 4.304.36, (m, 1H), 4.09 (dd, J=13.6, 4.0 Hz, 1H), 3.91–3.86 (m, 5H), 3.34–3.30 (m, 5H), 3.18 (dd, J=13.6 ,4.0 Hz, 1H).
MS m/z 407 (M+H)+.
EXAMPLE 16
2-[(2S ,4S)-1-acetyl-4-fluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxamide




Step 1: 1-Benzyl-2-methyl-(2S,4S)-4-fluoropyrrolidine-1,2-dicarboxylate




1-benzyl-2-methyl(2S,4R) 4-hydroxypyrrolidine-1,2 dicarboxylate in dichloromethane was added dropwise to a solution, precooled to −78° C., of N,N-diethylaminosulfur trifluoride (1.0 eq.) in dichloromethane. The reaction was stirred while the temperature was allowed to increase to 25° C. The solvent was concentrated under vacuum and the crude was purified by flash chromatography (eluent:petroleum ether:EtOAc=1:1) to give the title compound.
1H NMR (CDCl3, 300 MHz, 300 K) δ 7.42–7.30 (m, 5H), 5.35–5.10 (m, 3H), 4.65 (d, J=9.6 Hz, 0.5H), 4.57 (d, J=9.4Hz, 0.5H), 3.99–3.62 (m, 2H), 3.79 (s, 1.5H), 3.68 (s, 1.5H), 2.62–2.29 (m, 2H).
MS: m/z 282 (M+H)+.
Step 2: (4S)-1-[(Benzyloxy)carbonyl]-4-fluoro-L-proline




1-Benzyl-2-methyl-(2S,4S)-4-fluoropyrrolidine-1,2-dicarboxylate dissolved in methanol was treated with NaOH 1N (2 eq.) and the reaction mixture was stirred at 50° C. for 3 hours. After concentration of the solvent, HCl 1N was added until pH=1 and the aqueous layer was extracted three times with dichloromethane. The organic phase was washed with brine, dried over Na2SO4 and filtered to give, after concentration, title compound.
1HNMR (CDCl3, 400 MHz, 300 K) δ 7.45–7.30 (m, 5H), 5.33–5.18 (m, 3H), 4.70–4.60 (bm, 1H), 4.00–3.65 (m, 2H), 2.85–2.25 (m, 2H).
MS: m/z 268 (M+H)+.
Step 3: Benzyl-(2S,4S)-2-aminocarbonyl-4-fluoropyrrolidine-1-carboxylate




A stirred solution of (4S)-I-[(Benzyloxy)carbonyl]-4-fluoro-L-proline in dioxane was treated with pyridine-(0.7 eq.) and Boc2O (1.3 eq.), then ammonium bicarbonate (1.26 eq.) was added and the mixture was stirred at room temperature for 15 hours. Dioxane was concentrated and the residue was taken up in ethyl acetate, washed with 1 N HCl and brine, dried over Na2SO4 to give, after filtration and concentration, title compound.
1H NMR (DMSO-d6, 400 MHz, 340 K) δ 7.40–7.28 (m, 5H), 5.25 (dt, JH-F=53.6 Hz, J=4.5 Hz, 1H), 5.13–5.06 (m, 2H), 4.28 (d, J=9.6 Hz, 1H), 3.80–3.63 (m, 2H), 2.45–2.21 (m, 2H).
MS: m/z 267 (M+H)+.
Step 4: Benzyl-(2S,4S)-2-cyano-4-fluoropyrrolidine-1-carboxylate




Benzyl-(2S,4S)-2-aminocarbonyl-4-fluoropyrrolidine-1-carboxylate in dichloromethane was treated at 0° C. with Et3N (2.1 eq.) and trifluoroacetic anhydride was added dropwise.
The reaction mixture was stirred at 0° C. for 0.5 hour and 10 minutes at room temperature. Then, it was diluted with dichloromethane, washed with HCl 1N and brine, dried over Na2SO4 and filtered to give, after concentration, title compound.
1H NMR (DMSO-d6, 400 MHz, 340 K) δ 7.42–7.30 (m, 5H), 5.40 (dbt, JH-F=52.3 Hz, 1H), 5.20 (d, J=12.7 Hz, 1H), 5.16 (d, J=12.7 Hz, 1H), 4.94 (d, J=8.4 Hz, 1H), 3.68–3.56 (m, 2H), 2.63–2.41 (m, 2H).
MS: m/z 249 (M+H)+.
Step 5: Benzyl-(2S,4S)-2-[amino(hydroxyimino)methyl]-4-fluoropyrrolidine-1-carboxylate




Benzyl-(2S,4S)-2-cyano-4-fluoropyrrolidine-1-carboxylate dissolved in absolute ethanol was treated with triethyl amine (1.5 eq.) and hydroxylamine hydrochloride (1.3 eq.).
The reaction mixture was stirred at 50° C. for 3 hours and then the solvent was removed under reduced pressure. The residue was partitioned between water and dichloromethane and the aqueous layer was extracted with dichloromethane three times. The organic phase was dried over Na2SO4 and filtered. The solid obtained by concentration was then recrystallized from MeOH to give title compound.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 9.10 (bs, 1H), 7.40–7.25 (m, 5H), 5.35–5.15 (m, 3H), 5.07 (m, 2H), 4.43 (d, J=9.1 Hz, 1H), 3.72–3.56 (m, 2H), 2.45–2.20 (m, 2H).
MS: m/z 282 (M+H)+.
Step 6: Dimethyl-2-{[(amino-{(2S,4S)-1-[(benzyloxy)carbonyl]-4-fluoropyrrolidin-2-yl }methylidene)amino]oxy }but-2-enedioate




Benzyl-(2S,4S)-2-[amino(hydroxyimino)methyl]-4-fluoropyrrolidine-1-carboxylate in chloroform was treated with dimethylacetylene dicarboxylate for 3 hours at 60° C. The chloroform was then concentrated to give the title compound as a 8:2 mixture of isomers.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 7.45–7.25 (m, 5H), 6.51 (bs, 1.6H), 6.14 (bs, 0.4H), 5.64 (s, 0.8H), 5.61 (s, 0.2H), 5.30 (dt, JH-F=53.9 Hz, J=4.6 Hz, 1H), 5.15–5.04 (m, 2H), 4.51 (t, J=8.8 Hz, 0.8H), 4.44 (bt, 0.4H), 3.85–3.48 (m, 8H), 2.67–2.23 (m, 2H).
MS: m/z 424 (M+H)+.
Step 7: Methyl-2-{(2S,4S)-1-[(benzyloxy)carbonyl]-4-fluoropyrrolidin-2-yl}-5,6-dihydroxypyrimidine-4-carboxylate




Dimethyl-2-{[(amino-{(2S,4S)-1-[(benzyloxy)carbonyl]-4-fluoropyrrolidin-2-ylmethylidene)amino]oxy}but-2-enedioate was refluxed for 6 hours in ortho-xylene. The reaction mixture was then cooled down to room temperature and petroleum ether was added. A light brown solid precipitated to give after filtration title compound, that was not purified furthermore, but used as such in the following reaction.
Step 8: Methyl-5-(benzoyloxy)-2-{(2S,4S)-1-[(benzyloxy)carbonyl]-4-fluoropyrrolidin-2-yl}-6-hydroxypyrimidine-4-carboxylate




Methyl-2-{(2S ,4S)-1-[(benzyloxy)carbonyl)]-4-fluoropyrrolidin-2-yl}-5,6-dihydroxypyrimidine-4-carboxylate in pyridine was treated with benzoic anhydride (1.3 eq.) and the reaction mixture was stirred at room temperature overnight. Pyridine was concentrated and the residue was taken up in ethyl acetate and washed with HCl 1N and brine. The organic phase was dried over Na2SO4 and filtered to give after concentration a crude that was purified by flash chromatography, (eluent:petroleum ether:ethyl acetate=1:1) to give title compound.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 13.50 (bs, 1H), 8.09 (d, J=7.7 Hz, 2H), 7.80 (t, J=7.35 Hz, 1H), 7.64 (t, J=7.8 Hz, 2H), 7.45–7.15 (m, 5H), 5.36 (dbt, JH-F=54 Hz, 1H), 5.14 (m, 2H),5.02–4.93 (m, 1H), 3.95–3.60 (m, 2H), 3.76 (s, 3H), 2.80–2.36 (m, 2H).
MS: m/z 496 (M+H)+.
Step 9: Methyl-5-(benzoyloxy)-2-{(2S,4S)-1-[(benzyloxy)carbonyl]-4-fluoropyrrolidin-2-yl}-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate 




Methyl-5-(benzoyloxy)-2-{(2S,4S)-1-[(benzyloxy)carbonyl]-4-fluoropyrrolidin-2-yl}-6-hydroxypyrimidine-4-carboxylate, dissolved in dry dioxane, was added to a suspension of lithium hydride (1.2 eq.) in dry dioxane. The reaction mixture was stirred at 38° C. for 45 minutes and then cooled down to room temperature. Dimethyl sulfate (1.3 eq.) was added and the mixture was heated to 58° C. and stirred at this temperature for 3 hours. The reaction mixture was then cooled down and glacial acetic acid (0.2 eq.) was added, followed by water and ethyl acetate. The aqueous layer was separated and extracted with ethyl acetate; the organic phase was dried over Na2SO4 and filtered to give, after concentration, a crude that was purified by flash chromatography (eluent petroleum ether:ethyl acetate from 4:6 to 2:8) to give the title compound as a 4.6:5.4 mixture of rotamers by NMR.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 8.08 (d, J=7.5 Hz, 2H), 7.79 (t, J=7.3 Hz, 1H), 7.63 (t, J=7.5 Hz, 2H), 7.37–7.11 (m, 5H), 5.48–5.38 (m, 2H), 5.20 (d, J=12.8 Hz, 0.46H), 5.12 (d, J=11.8 Hz, 0.54H), 5.10 (d, J=12.5 Hz, 0.54H), 4.92 (d, J=12.8 Hz, 0.46H), 4.00–3.75 (m, 2H), 3.72 (s, 3H), 3.59 (s, 1.6H), 3.52 (s, 1.4H), 2.90–2.65 (m, 2H).
MS: m/z 510 (M+H)+.
Step 10: Methyl-2-[(2S,4S)-1-acetyl-4-fluoropyrrolidin-2-yl]-5-(benzoyloxy)-6-hydroxypyrimidine-4-carboxylate




Methyl-5-(benzoyloxy)-2-{(2S,4S)-1-[(benzyloxy)carbonyl]-4-fluoropyrrolidin-2-yl}-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxylate, dissolved in ethyl acetate was treated with Pd/C 10% (10% w/w) and acetic anhydride (1 eq.) and submitted under H2 atmosphere at room temperature. The reaction mixture was stirred at room temperature for 18 hours and then the suspension was filtered over celite to give the title compound as a 7:3 mixture of rotamers by NMR.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 8.07 (m, 2H), 7.78 (m, 1H), 7.62 (m, 2H), 5.75–5.26 (m, 2H), 4.13–3.60 (m, 2H), 3.72 (s, 3H), 3.59 (s, 3H), 2.79–2.36 (m, 2H), 2.03 (s, 2.1H), 1.87 (s, 0.9H).
MS: m/z 418 (M+H)+.
Step 11: 2-[(2S,4S)-1-acetyl-4-fluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
Methyl-2-[(2S,4S)-1-acetyl4-fluoropyrrolidin-2-yl]-5-(benzoyloxy)-6-hydroxypyrimidine-4-carboxylate was dissolved in MeOH (0.12 N) and treated with 4-F-benzylamine (3 eq.) in a sealed tube. The reaction mixture was stirred at 65° C. for 18 hours, then it was cooled down. The solvent was evaporated and the residue was washed with ethyl ether several times to obtain a solid that was recrystallized from ethanol and washed again with ethyl ether to give the title compound as a 7.3:2.7 mixture of rotamers by NMR.
1H NMR (DMSO-d6, 500 MHz, 300 K) δ 12.01 (bs, 1H), 8.52 (t, J=6.3 Hz, 0.7H), 8.34 (t, J=6.3 Hz, 0.3H), 7.34–7.29 (m, 2H), 7.18–7.12 (m, 2H), 5.39 (dbt, JH-F=54.3 Hz, 0.7H), 5.29 (dt, JH-F=54.2 Hz, J=4.4 Hz, 0.3H), 5.38 (d, J=8.9 Hz, 0.3H), 5.18 (dd, J=9.2 and 1.6 Hz, 0.7H), 4.55–4.47 (m, 2H), 4.20–3.78 (m, 2H), 3.51 (s, 2.1H), 3.50 (s, 0.9H), 2.75–2.54 (m, 1H), 2.47–2.27 (m, 1H), 2.00 (s, 2.1H), 1.81 (s, 0.9H),
MS: m/z 407 (M+H)+.
EXAMPLE 17
2-{(2S,4R)-1-[(dimethylamino)(oxo)acetyl]-4-methoxypyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: (4R)-1-[(Benzyloxy)carbonyl]-4-methoxy-L-proline




Synthesized following the procedure reported on Journal of Medicinal Chemistry 1988, 31, 875–885.
Step 2: Benzyl-(2S,4R)-2-cyano-4-methoxypyrrolidine-1-carboxylate




To compound (4R)-1-[(Benzyloxy)carbonyl]-4-methoxy-L-proline dissolved in dioxane, Boc anhydride (1.3 eq), NH4HCO3 (1.26 eq.) and pyridine were added. The mixture was stirred overnight at room temperature. Dioxane was removed in vacuo and the residue, dissolved in ethyl acetate, was washed with HCl 1N, saturated aqueous NaHCO3 and brine, dried over Na2SO4, filtered and concentrated in vacuo to get the primary amide. The crude product was dissolved in dichloromethane and triethylamine (2.1 eq.) was added. The mixture was cooled down to 0° C. and trifluoroacetic anhydride (1.1 eq.) was added. After 1 hour the dichloromethane solution was diluted and washed with HCl 1N, saturated aqueous NaHCO3 and brine, dried over Na2SO4, filtered and evaporated in vacuo. The compound was purified by flash chromatography on silica gel (eluent ethyl acetate:petroleum ether=20%:80%) as a 4:6 mixture of rotamers by NMR.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 7.45–7.3 (m, 5H), 5.20 (d, J=12 Hz, 0.4H), 5.14 (s, 1.2H), 5.12 (d, J=12 Hz, 0.4H), 4.75 (t, J=7 Hz, 0.4H), 4.64 (t, J=7.8 Hz, 0.6H), 4.02 (bs, 1H), 3.6–3.45 (m, 2H), 3.21 (s, 3H), 2.45–2.40 (partially under DMSO) (m, 1H), 2.40–2.25 (m, 1H).
Step 3: Benzyl-(2S,4R)-2-[amino(hydroxyimino)methyl]-4methoxypyrrolidine-1-carboxylate




To benzyl-(2S,4R)-2-cyano4-methoxypyrrolidine-1-carboxylate, dissolved in ethanol (0.4 M), hydroxylamine hydrochloride (1.3 eq.) and triethylamine (1.5 eq.) were added. The mixture was stirred at 40° C. for 4 hours then at room temperature overnight. The mixture was concentrated in vacuo and the residue dissolved in ethyl acetate washed with brine, dried over Na2SO4, filtered and concentrated to give title compound.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 9.05 (bs, 1H), 7.45–7.25 (m, 5H), 5.4 (bs, 2H), 5.10 (d, J=13 Hz, 1H), 5.03 (d, J=13 Hz, 1H), 4.26 (t, J=7.4 Hz, 1H), 3.97 (bs, 1H), 3.63–3.45 (m, 2H), 3.22 (s, 3H) 2.3–2.03 (m, 2H).
Step 4: Dimethyl-2-{[(amino-{(2S,4R)-1-[(benzyloxy)carbonyl]-4-methoxypyrrolidin-2-yl}methylidene)amino]oxy}but-2-enedioate




To benzyl-(2S,4R)-2-[amino(hydroxyimino)methyl]-4methoxypyrrolidine-1-carboxylate, dissolved in chloroform, dimethyl acetylendicarboxylate (1.1 eq.) was added. The mixture was refluxed for 1 hour and left stirring at 40° C. overnight. The chloroform was removed in vacuo and the crude product purified by flash chromatography on silica gel (eluent ethyl acetate:petroleum ether=40:60). Two isomers were present in ratio 7:3.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 7.40–7.23 (m, 5H), 6.7–6.55 (2bs, 1.4H), 6.35–6.2 (bs, 0.6H), 5.61 (s, 0.7H), 5.59 (s, 0.3H), 5.10 (d, J=13 Hz, 0.7H), 5.08 (s, 0,6H), 5.02 (d, J=13 Hz, 0.7H), 4.30–4.20 (m, 1H), 3.97 (bs, 1H) 3.78 (s, 3.73 (s, 0.9H), 3.62 (s, 0.9H), 3.59 (s, 2.1H), 3.65–3.50 (m, 2H), 3.22 (s, 3H), 2.37–2.23 (m, 1H), 2.10–1.95 (m, 1H).
Step 5: Methyl 5-(benzoyloxy)-2-{(2S,4R)-1-[(benzyloxy)carbonyl]-4-methoxypyrrolidin-2-yl}-6-hydroxypyrimidine-4-carboxylate




Dimethyl-2-{[(amino-{(2S,4R)-1-[(benzyloxy)carbonyl]-4-methoxypyrrolidin-2-yl}methylidene)amino]oxy}but-2-enedioate were dissolved in xylene and the solution stirred at 150° C. for 3 hours and at room temperature overnight. Xylene was concentrated in vacuo. To the crude compound, dissolved in pyridine, benzoic anhydride (1.3 eq.) was added and the reaction mixture was stirred at room temperature overnight. The solution was concentrated in vacuo and the crude dissolved in ethyl acetate washed with 1 N HCl, saturated aqueous NaHCO3 and brine, dried on Na2SO4, filtered and evaporated in vacuo. The crude product was purified by flash chromatography on silica gel (eluent ethyl acetate:petroleum ether=10:90) and showed a 1:1 mixture of rotamers by NMR.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 13.5 (s, 1H), 8.09 (t, J=7.0 Hz, 2H), 7.82–7.75 (m, 1H), 7.66–7.61 (m, 2H), 7.40–7.25 (m, 4H), 7.12–7.06 (m, 1H), 5.10 (s, 1H), 5.09 (d, J=12.5 Hz, 0.5H), 4.88 (d, J=12.5 Hz, 0.5H), 4.66 (dd, J=16.2 and 8.0 Hz, 1H), 4.10–4.00 (m, 1H), 3.74 (s, 3H), 3.75–3.60 (m, 2H), 3.25 (s, 3H), 2.45–2.40 (partially under DMSO) (m, 1H), 2.13–2.03 (m, 1H).
Step 6: Methyl-5-(benzoyloxy)-2-{(2S,4R)-1-[(benzyloxy)carbonyl]-4-methoxypyrrolidin-2-yl}-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate




To methyl 5-(benzoyloxy)-2-{(2S,4R)-1-[(benzyloxy)carbonyl]4-methoxypyrrolidin-2-yl}-6-hydroxypyrimidine-4-carboxylate, dissolved in dioxane, LiH (1.4 eq.) was added and the reaction mixture stirred at 38° C. for 40 minutes. The temperature was raised to 60° C. and dimethyl sulphate (1.3 eq.) was added dropwise. After two hours the reaction mixture was cooled down to 0° C. and HCl 1 N was added to quench the reaction. The reaction mixture was extracted with ethyl acetate and the organic phase washed with HCl 1N, saturated aqueous NaHCO3 and brine, dried on Na2SO4, filtered and concentrated in vacuo. The desired product was isolated by flash chromatography on silica gel (eluent ethyl acetate:petroleum ether=30:70) as a 1:1 mixture of rotamers by NMR:
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 8.08 (t, J=6.8, 2H), 7.82–7.75 (m, 1H), 7.66–7.61 (m, 2H), 7.38–7.22 (m, 4H), 7.08–7.02 (m, 1H), 5.18–5.12 (m, 1H), 5.13 (d, J=13.1 Hz, 0.5H), 5.07 (d, J=13.1 Hz, 0.5H), 5.06 (d, J=12.4 Hz, 0.5H), 4.84 (d, J=12.4 Hz, 0.5H), 4.08–4.17 (m, 1H), 3.73 (s, 3H), 3.75–3.55 (m, 2H), 3.65 (s, 1.5H), 3.44 (s, 1.5H), 3.26 (s, 3H), 2.62–2.52 (partially under DMSO) (m, 1H), 2.30–2.15 (m, 1H).
MS: m/z 522 (M+H)+
Step 7: Benzyl-(2S,4R)-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-4-methoxypyrrolidine-1-carboxylate




To methyl-5-(benzoyloxy)-2-{(2S,4R)-1-[(benzyloxy)carbonyl]-4-methoxypyrrolidin-2-yl}-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate,dissolved in methanol, 4-F-benzylamine (3 eq.) was added. The reaction mixture was stirred at reflux overnight. Methanol was removed in vacuo and the residue triturated with ethyl ether to give the title product as a 4:6 mixture of rotamers by NMR:
1H NMR (DMSO-d6+TFA, 400 MHz, 300 K) δ 14.0 (bs, 1H), 8.92 (t, J=6.4 Hz, 0.4H), 8.73 (t, J=5.9 Hz, 0.6H), 7.35–7.25 (m, 4H), 7.20–7.05 (m, 4H), 6.93 (d, J=7.5 Hz, 1H), 5.09–4.95 (m, 1H), 5.09 (d, J=12.3 Hz, 0.6H), 4.75 (d, J=12.3 Hz, 0.6H), 5.05 (d, J=13 Hz, 0.4H), 4.98 (d, J=13 Hz, 0.4H), 4.52–4.43 (m, 2H), 4.12–4.06 (bm, 0.4H), 4.06–4.02 (bm, 0.6H), 3.87 (dd, J=11.5 and 4.5 Hz, 0.4H), 3.84 (dd, J=12 and 2.7Hz, 0.6H), 3.65–3.55 (m, 1H), 3.59 (s, 1.2H), 3.41 (s, 1.8H), 3.25 (s, 3H), 2.45–2.40 (partially under DMSO) (m, 1H), 2.30–2.15 (m, 1H).
MS: m/z 511 (M+H)+
Step 8: N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-4-methoxypyrrolidin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Benzyl-(2S,4R)-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-4-methoxypyrrolidine-1-carboxylate was dissolved in methanol and Pd/C 10% wt (14% w/w) was added. The mixture was stirred under H2 atmosphere at room temperature. After 2 hours the reaction mixture was filtered and methanol was removed in vacuo to give title compound.
1H NMR (DMSO-d6+TFA, 400 MHz, 300 K) δ 12.58 (bs, 1H), 10.16 (bs, 1H), 9.74 (t, J=6.3 Hz, 1H), 8.90 (bs, 1H), 7.36 (dd, J=8.5 and 5.7 Hz, 2H), 7,19 (t, J=8.8 Hz, 2H), 5.01 (bs, 1H), 4.50–4.60 (m, 2H), 4.19 (bs, 1H), 3.55–3.45 (m, 1H), 3.47 (s, 3H), 3.45–3.35 (m, 1H), 3.32 (s, 3H), 2.74 (dd, J=13.9 and 7.5 Hz, 1H), 2.17–2.10 (m, 1H).
MS: m/z 377 (M+H)+
Step 9: 2-{(2S,4R)-1-[(dimethylamino)(oxo)acetyl]-4-methoxypyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
To N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-4-methoxypyrrolidin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxamide, triethylamine (1 eq.) was added. The reaction mixture was cooled down to 0° C. and methyl chlorooxoacetate (3 eq.) was added. After 1 hour the reaction mixture was concentrated and a big excess of dimethylamine 2M in THF (30 eq.) was added The reaction mixture was concentrated and the desired compound was isolated by HPLC purification (Waters, Symmetry C18, 5 um, 19×50 mm eluting with water and acetonitrile containing 0.1% trifluoroacetic acid) as a 2:8 mixture of rotamers by NMR.
1H NMR (DMSO-d6, 400 MHz, 340 K) δ 11.9 (bs, 1H), 8.99 (bs, 0.8H), 8.85 (bs, 0.2H), 7.40–7.30 (m, 2H), 7.14 (t, J=8.8 Hz, 2H), 5.21 (t, J=7.5 Hz, 1H), 4.54 (dd, J=14.9 and 6.7 Hz, 1H),;4.45 (dd, J=14.9 and 6.4 Hz, 1H), 4.10 (bs, 1H), 3.91 (dd, J=11.6 and 4.6 Hz, 0.2H), 3.79 (dd, J=11.2 and 4.4 Hz, 0.8H), 3.60–3.50 (m, 1H), 3.58 (s, 2.4H), 3.48 (s, 0.6H), 3.29 (s, 0.6H), 3.27 (s, 2.4H), 2.87 (s, 2.4H), 2.81 (s, 2.4H), 2.64 (s, 0.6H), 2.57 (s, 0.6H), 2.70–2.50 (m, 1H), 2.30–2.20 (m, 0.8H), 2.20–2.10 (m, 0.2H).
MS: m/z 476, (M+H)+
EXAMPLE 18 
N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide (11)




Step 1: 2-Amino-2-methylpropanenitrile




Organic Synthesis Coll. Vol.11 pg 29 Acetone cyanohydrin was diluted with MeOH (approx. 3 mmol/mL). The solution was cooled and saturated with ammonia gas, and the reaction mixture was allowed to stand for one day. The excess of ammonia and methyl alcohol were evaporated by rotary evaporation. Residue consisted in the title product.
Step 2: Benzyl 1-cyano-1-methylethylcarbamate




To a suspension of 2-amino-2-methylpropanenitrile in water an equimolar amount of Na2CO3 and a slight excess (1.1 eq) of benzylchloroformate were added, with an external cooling. Reaction mixture was stirred o/n at room temperature, extracted in EtOAc and the organic phase was washed with NaHCO3ss, dried (Na2SO4), filtered and concentrated. Product was obtained as a white solid.
1H-NMR (CDCl3) δ 7.48–7.33 (bs, 5H), 5.15 (s, 2H), 4.98 (bs, 1H), 1.68 (s, 6H);
13C-NMR (CDCl3) δ 153.33, 13.81, 127.81, 127.63, 127.55, 120.64, 66.56, 46.19, 26.67; MS (M+1) m/z 219.
Step, 3: Benzyl 2-amino-2-(hydroxyimino)-1,1-dimethylethylcarbamate




Hydroxylamine hydrochloride in methanol was added to an equimolar stirred solution of potassium hydroxide in methanol. The mixture was stirred for 15 min and the precipitated potassium chloride was removed by filtration. The filtrate was added to an equimolar amount of the nitrile and the solution stirred overnight at 40° C., then cooled to room temperature and concentrated. The resulting residue was triturated with water and the white solid, after drying under vacuum, consists mainly in the title product.
1H-NMR (DMSO) δ 9.12 (bs, 1H), 7.48 (bs, 5H), 7.08 (bs, 1H), 5.33 (bs, 2H), 4.98 (s, 2H), 1.39 (s, 6H); MS (M+1) m/z 252.
Step 4: Methyl 2-(1-{[(benzyloxy)carbonyl]amino}-1-methylethyl)-5,6-dihydroxypyrimidine-4-carboxylate




Benzyl 2-amino-2-(hydroxyimino)-1,1-dimethylethylcarbamate was suspended in chloroform and treated with 1.2 eq of dimethylacetylenedicarboxylate and reaction was refluxed overnight. After cooling at room temperature, volatiles were evaporated and the residue was taken into xylene and heated at 145° C. for 48 h. The reaction mixture was stirred at room temperature overnight to allow the precipitation of the product (5) as a light brown solid. This solid was collected by filtration and washed with diethyl ether.
1H-NMR (DMSO) δ 12.54 (s, 1H), 10.21 (s, 1H), 7.44 (bs, 1H), 7.30 (bs, 5H), 4.95 (s, 2H), 3.80 (s, 3H), 1.47 (s, 6H); MS (M+l) m/z 362.
Step 5: Methyl 5-(benzoyloxy)-2-(1-{[(benzyloxy)carbonyl]amino}-1-methylethyl)-6-hydroxypyrimidine-4-carboxylate




To a stirred solution of methyl 2-(1-{[(benzyloxy)carbonyl]amino}-1-methylethyl)-5,6-dihydroxypyrimidine-4-carboxylate in pyridine, 1.1 eq of benzoic anhydride were added and stirring prolonged at room temperature over night. Pyridine was evaporated and residue was taken in ethyl acetate and washed with 1 N HCl and brine. Organic layer was separated, dried (Na2SO4), filtered and concentrated by rotary evaporation and residue was purified by flash column chromatography (SiO2, petroleum ether/ethyl acetate 60/40 v/v as eluant). Collection and evaporation of appropriate fractions afforded title product.
1H-NMR (CDCl3) δ 12.2 (bs, 1H), 8.15 (d, J=7.4 Hz, 2H), 7.65 (t, J=7.4 Hz, 1H), 7.50 (t, J=7.5 Hz, 2H), 7.32 (bs, 5H), 5.54 (bs, 1H), 5.05 (s, 2H), 3.82 (s, 3H), 1.67 (s, 6H); MS (M+1) m/z 466.
Step 6: Methyl 5-(benzoyloxy)-2-(1-{[(benzyloxy)carbonyl]amino}-1-methylethyl)-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxylate




To a stirred solution of LiH (1.1 eq) in dioxane, methyl 5-(benzoyloxy)-2-(1-{[(benzyloxy)carbonyl]amino}-1-methylethyl)-6-hydroxypyrimidine-4-carboxylate was added and the mixture was stirred at 38° C. for 45 min. After cooling down to room temperature, dimethylsulfate (1.3 eq) was added and reaction mixture was heated at 60° C. for 2 h. Mixture was then cooled to room temperature, dioxane evaporated and residue was purified by flash chromatography, eluting with 65/55 v/v petroleum ether/ethyl acetate. Collection and evaporation of appropriate fractions afforded the title product.
1H-NMR (CDCl3) δ 8.19 (d, J=7.3Hz, 2H), 7.65 (t, J=7.3Hz, 1H), 7.51 (t, J=7.6 Hz, 2H), 7.33 (bs, 5H), 5.63 (bs, 1H), 5.03 (s, 2H), 3.80 (s, 3H), 3.63 (bs, 3H), 1.72 (s, 6H); MS (M+1) m/z 480.
Step 8: Benzyl 1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethylcarbamate




To a methanolic solution of methyl 5-(benzoyloxy)-2-(1-{[(benzyloxy)carbonyl]amino}-1-methylethyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate, p-fluoro benzylamine (3 eq) was added and mixture was refluxed over night. After evaporation of methanol, residue was taken in EtOAc, washed with 1N HCl and brine, dried (Na2SO4), filtered and evaporated to obtain the title product.
1H-NMR (CDCl3) δ 11.9 (bs, 1H), 7.79 (bt, 1H), 7.35–7.29 (m, 7H), 7.07 (t, J=8.6 Hz, 2H), 5.27 (bs, 1H), 5.02 (bs, 2H), 4.58 (d, J=6.2 Hz, 2H), 3.67 (s, 3H), 1.70 (s, 6H); MS (M+1) m/z 469.
Step 9: 2-(1-amino-1-methylethyl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxamide




A methanolic solution of Benzyl 1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethylcarbamate was stirred over night under a hydrogen atmosphere in the presence of catalytic 10% Pd/C. Catalyst was then filtered off through celite, and the filtrate was concentrated. Product was obtained after trituration with ethyl ether.
1H-NMR (DMSO) δ 12.31 (bs, 1H), 9.68 (bt, J=6.6 Hz, 1H), 8.60 (bs, 2H), 7.43 (dd, J=8.4 Hz, J=5.7 Hz,2H), 7.20 (t, J=8.8 Hz,2H), 4.54 (d, J=6.6 Hz, 2H), 3.56 (s, 3H), 1.73 (s, 6H); MS (M+1) m/z 335.
Step 10: Methyl {[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]amino}(oxo)acetate




To a stirred mixture of 2-(1-amino-1-methylethyl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxamide (4) and triethyl amine (3 eq) in chloroform, methyl chlorooxoacetate (1.5 eq) was added with an external cooling. Finished the addition, the ice bath was removed and the mixture was stirred at room temperature for 3 h. Reaction mixture was then partitioned between chloroform and 1N HCl. Organic layer was separated, washed with brine, dried (Na2SO4), filtered and concentrated to obtain title product.
1H-NMR (DMSO) δ 12.2 (bs, 1H), 9.47 (s, 1H), 9.04 (t, J=6.3 Hz, 1H), 7.38 (dd, J=8.4Hz, J=5.7 Hz, 2H), 7.16 (t, J=8.8 Hz, 2H), 4.50 (d, J=6.3 Hz, 2H), 3.78 (s, 3H), 3.45 (s, 3H), 1.67 (s, 6H); MS (M+1) m/z 421.
Step 11: N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide  (11)
Methyl {[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]amino}(oxo)acetate was refluxed in an excess of 2 M solution of dimethylamine in THF for 2 h. Reaction mixture was cooled to room temperature, evaporated and residue was purified by RP HPLC (C1 8, water/acetonitrile containing 0.1% of trifluoroacetic acid as eluant). Collection and lyophilization of appropriate fractions afforded the title product.
1H-NMR (DMSO) δ 12.19 (s, 1H), 9.32 (s, 1H), 9.06 (t, J=6.4 Hz, 1H), 7.40 (dd, J=8.5 Hz, J=5.7 Hz, 2H), 7.18 (t, J=8.8 Hz, 2H), 4.51 (d, J=6.4 Hz, 2H), 3.55 (s, 3H), 2.93 (s, 3H), 2.87 (s, 3H), 1.68 (s, 6H); 13C-NMR (DMSO) δ 168.23, 163.76, 163.09, 161.20 (d, J=96.4 Hz), 158.46, 151.90, 145.49, 134.77, 129.40 (d, J=3.2 Hz), 124.29, 115.05 (d, J=8.5 Hz), 56.50, 41.51, 35.46, 33.42, 32.68, 26.85; MS (M+1) m/z 434; MS (M+1) m/z 434.
EXAMPLE 19 
Step 1: 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-dihydropyrimidine-4-carboxamide




A solution of 5-methyl-1,3,4-oxadiazole-2-carboxylic acid was treated with 1.9 equivalents of oxalyl chloride and a few drops of anhydrous N,N-dimethylformamide. After 1 h, mixture was concentrated, residue was triturated with n-hexane and directly added to an equimolar solution of 2-(1-amino-1-methylethyl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxamide (described in step 9, example 18) in acetonitrile. Triethyl amine (3 eq) was added to the mixture and the reaction was stirred overnight at room temperature. Title product was isolated by prep RP HPLC (C18, acetonitrile/water containing 0.1% of trifluoroacetic acid as eluant).
1H-NMR (DMSO) δ 12.2 (bs, 1H), 9.84 (s, 1H), 9.05 (t, J=6.5 Hz, 1H), 7.38 (dd, J=8.4 Hz, J=5.6 Hz, 2H), 7.17 (t, J=8.8 Hz, 2H), 4.50 (d, J=6.5 Hz,2H), 2.56 (s, 3H), 1.74 (s, 6H), one methyl signal obscured by water;
MS (M+1) m/z 445.
EXAMPLE 20
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




Step1: 1-Benzyl-2-methyl-(2S)-4-oxopyrrolidine-1,2-dicarboxylate




A solution of dimethyl sulfoxide (2.1 eq) in dry dichloromethane was added dropwise to a stirred solution of oxalyl chloride (1.01 eq) in dry dichloromethane (1.25 N) at −78° C. under N2 atmosphere. After 15 min, a solution of the commercially available 1-benzyl-2-methyl-(2S,4R)-4-hydroxypyrrolidine-1,2-dicarboxylate in dry dichloromethane was added slowly, and stirring was continued for 30 min at −78° C. After addition of triethylamine (5 eq), the mixture was gradually warmed up to room temperature. The mixture was quenched with water and aqueous layer was separated and extracted with dichloromethane. The extract was washed with brine and dried over Na2SO4. Concentration of the solvent in vacuo gave a residue, which was purified by flash cromatography (ethyl acetate:petroleum ether=3:7) to give title product as a yellow oil.
1H NMR (DMSO-d6+TFA, 400 MHz, 330 K) δ 7.40–7.32 (m, 5H), 5.20–5.09 (m, 2H), 4.79 (d, J=9.7 Hz, 1H), 3.95 (d, J=17.9 Hz, 1H), 3.78 (d, J=17.9 Hz, 1H), 3.64 (s, 3H), 3.13 (dd, J=18.7 and 10.6, 1H), 2.62 (dd, J=18.7 and 2.7 Hz, 1H).
MS: m/z 278 (M+H)+
Step 2: l-Benzyl 2-methyl (2S)-4,4-difluoropyrrolidine-1,2-dicarboxylate




A solution of 1-benzyl-2-methyl-(2S)-4-oxopyrrolidine-1,2-dicarboxylate in dichloromethane was slowly added to a solution of diethylaminosulfur fluoride in dichloromethane precooled to −78° C. The reaction mixture was warmed to room temperature and mixed with cold water. The organic layer was separated, washed with water, dried over Na2SO4 and evaporated to give title compound as a yellow oil.
1H NMR (DMSO-d6, 400 MHz, 330K) δ 7.40–7.32 (m, 5H), 5.16–5.12 (m, 2H), 4.63 (br s, 1H), 3.96–3.80 (m, 2H), 3.65 (s, 3H), 3.15–2.86 (m, 1H), 2.56–2.45 (partially under DMSO) (m, 1H).
19F NMR 1H19F dec (DMSO-d6, 400 MHz, 330 K) δ −98.13 (d, J=223.7 Hz)±98.72 (d, J=223.6 Hz) (rotamer a), −101.38 (d, J=190.7 Hz)±102.00 (d, J=191.3 Hz) (rotamer b) (2F).
MS m/z 300 (M+H)+.
Step 3: 1-[(Benzyloxy)carbonyl]-4,4-difluoro-L-proline




A solution of 1-benzyl 2-methyl (2S)-4,4-difluoropyrrolidine-1,2-dicarboxylate in methanol was refluxed with 2N NaOH (2 eq) for 2 hours. Methanol was removed and pH adjusted to 1 with 3 N HCl obtaining a suspension which was extracted several times with ethyl acetate. Combined organics were dried over Na2SO4 and evaporated to give title product as a dark brown oil.
1H NMR (DMSO-d6, 400 MHz, 330K) δ 12.96 (br s, 1H), 7.36–7.31 (m, 5H), 5.11 (s, 2H), 4.50 (bs, 1H), 3.91–3.80 (m, 2H), 3.01–2.82 (m, 1H), 2.56–2.41 (partially under DMSO) (m, 1H).
MS: m/z 284 (M−H)+.
Step 4: Benzyl-(2S)-2-aminocarbonyl4,4-difluoropyrrolidine-1-carboxylate




To a stirred solution of 1-[(benzyloxy)carbonyl]4,4-difluoro-L-proline, pyridine (0.6 eq.) and di-t-butyl dicarbonate (1.3 eq) in dioxane, ammonium bicarbonate (1.26 eq) was added and the mixture was stirred at room temperature for 20 hours. Dioxane was concentrated and the residue dissolved in ethyl acetate and washed with HCl 1 N, saturated aqueous NaHCO3 and brine, dried over Na2SO4, filtered and evaporated in vacuo to obtain a yellow oil.
Two sets of signals, two conformers (ratio 1:1) were present.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 7.56 (d, J=15.4 Hz, 1H), 7.39–7.34 (m, 5H), 7.17 (d, J=19.3 Hz, 1H), 5.10–5.08 (m, 2H), 4.42 (dd, J=9.3 and 4.7, 0.5H), 4.34 (dd, J=9.2 and 4.6 Hz, 0.5H), 3.92–3.73 (m, 2H), 2.902.72 (m, 1H), 2.43–2.30 (m, 1H).
MS: m/z 285 (M+H)+.
Step 5: Benzyl-(2S)-2-cyano-4,4-difluoropyrrolidine-1-carboxylate




A solution of benzyl-(2S)-2-aminocarbonyl-4,4-difluoropyrrolidine-1-carboxylate and triethylamine (2.1 eq.) in dichloromethane was cooled to 0° C. and trifluoroacetic anhydride (1.1 eq.).was added dropwise under nitrogen. Stirring was continued for 1 hour allowing the mixture to reach room temperature. Volatiles removed in vacuo and residue taken up in ethyl acetate, washed with HCl 1N, brine and dried over Na2SO4. Evaporation gave title compound as brown oil.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 7.40–7.34 (m, 5H), 5.20–5.03 (m, 3H), 3.99–3.72 (m, 2H), 3.06–2.69 (m, 2H).
Step 6: Benzyl-(2S)-2-[amino(hydroxyimino)methyl]4,4-difluoropyrrolidine-1-carboxylate




A solution of benzyl-(2S)-2-cyano-4,4-difluoropyrrolidine-1-carboxylate, hydroxylamine hydrochloride (1.4 eq.) and triethylamine (1.7 eq.) in ethanol was refluxed under nitrogen for 5 hours. Mixture was concentrated and residues taken up in ethyl acetate and washed with water and brine. Combined organics were dried over Na2SO4 and evaporated to give title compound as a foam.
1H NMR (DMSO-d6, 300 MHz, 330 K) δ 9.12 (bs, 1H), 7.38–7.34 (m, 5H), 5.36 (bs, 2H), 5.13 (d, J=14.4 Hz, 1H)+5.09 (d, J=14.4Hz, 1H), 4.56 (dd, J=8.6 and 4.9 Hz, 1H), 4.07–3.76 (m, 2H), 2.80–2.71 (m 1H), 2.60–2.51 (partially under DMSO) (m, 1H).
MS: m/z 300 (M+H)+.
Step 7: Dimethyl-2-{[(amino-(2S)-1-[(benzyloxy)carbonyl]-4,4-difluoropyrrolidin-2-yl}methylidene)amino]oxy}but-2-enedioate




A solution of benzyl-(2S)-2-[amino(hydroxyimino)methyl]4,4-difluoropyrrolidine-1-carboxylate and dimethylacetylendicarboxylate (1.2 eq.) in chloroform was refluxed for 1 hour under nitrogen and the solution was concentrated. Residue was purified by flash chromatography on silica gel, (eluent:petroleum ether:ethyl acetate=7.5:2.5), to give the desired product as a 3:1 mixture of two isomers by 1H NMR.
1H NMR (DMSO-d6, 300 MHz, 330 K) δ 7.45–7.25 (m, 5H), 6.63 (bs, 1.5H), 6.30 (bs, 0.5H), 5.62 (s, 0.75H), 5.60 (s, 0.25H), 5.13 (s, 2H),-4.58 (dd, J=9.1 and 4.9 Hz)+4.57 (dd, partially overlapped) (1H), 3.96–3.86 (m, 2H), 3.79 (s, 2.2H), 3.74 (s, 0.8H), 3.66 (s, 0.8H), 3.61 (s, 2.2H), 2.93–2.81 (m, 1H), 2.56–2.43 (partially under DMSO)(m, 1H).
MS: m/z 442 (M+H)+.
Step 8: Methyl-2-{(2S)-1-[(benzyloxy)carbonyl]-4,4-difluoropyrrolidin-2-yl}-5,6-dihydroxypyrimidine-4-carboxylate




A solution of dimethyl-2-{[(amino-{(2S)-1-[(benzyloxy)carbonyl]-4,4-difluoropyrrolidin-2-yl}methylidene)amino]oxy}but-2-enedioate in o-xylene was refluxed for 6 hours. Then the reaction was cooled down and concentrated at rotavapor. Ethyl ether was added until precipitation of a solid that was filtered, washed with other ethyl ether and dried to give the title pyrimidine as a brown solid. Two sets of signals, two rotamers (ratio 1:1) were present.
1H NMR (DMSO-d6, 400 MHz, 300 K) δ 12.97 (s, 1H), 10.38 (s, 1H), 7.40–7.29 (m, 3H), 7.22–7.15 (m, 1H); 7.10–7.05 (m, 1H), 5.12 (d, J=12.6 Hz, 0.5H) 5.10 (s, 1H) 4.89 (d, J=12.6 Hz, 0.5H), 4.86–4.72 (m, 1H), 4.10–3.86 (m, 2H), 3.81 (s, 3H), 2.90–2.85 (m, 1H), 2.64–2.53 (partially under DMSO) (m, 1H).
MS: n/z 410 (M+H)+.
Step 9: Methyl 5-(benzoyloxy)-2-{(2S)-1-[(benzyloxy)carbonyl]4,4-difluoropyrrolidin-2-yl}-6-hydroxypyrimidine-4-carboxylate




Methyl-2-{(2S)-1-[(benzyloxy)carbonyl]-4,4-difluoropyrrolidin-2-yl}-5,6-dihydroxypyrimidine-4-carboxylate in dry pyridine was treated with benzoic anhydride (2 eq.) overnight at room temperature.
The mixture was evaporated, taken up in ethyl acetate and washed with HCl 1N and brine. Organics were dried over Na2SO4, filtered and evaporated to obtain an oil which was purified by flash chromatography on silica gel (eluent:ethyl acetate:petroleum ether=7:3).
1H NMR (DMSO-d6, 300 MHz, 330 K) δ 13.51 (bs, 1H), 8.10 (d, J=7.6 Hz, 2H), 7.79 (t, J=7.1 Hz, 1H), 7.64 (t, J=7.6 Hz, 2H), 7.33–7.17 (m, 5H), 5.13 (s, 2H), 4.99 (t, J=7.3 Hz, 1H), 4.09–3.97 (m, 2H), 3.77.(s, 3H), 3.02–2.99 (m, 2H).
MS: m/z 514 (M+H)+.
Step 10: Methyl-5-(benzoyloxy)-2-{(2S)-1-[(benzyloxy)carbonyl]4,4-difluoropyrrolidin-2-yl}-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate




Methyl 5-(benzoyloxy)-2-{(2S)-1-[(benzyloxy)carbonyl]4,4-difluoropyrrolidin-2-yl}-6-hydroxypyrimidine-4-carboxylate dissolved in dry 1,4-dioxane was added to a suspension of LiH (1.4 eq.) in dioxane. The mixture was stirred at 38° C. for 45 minutes and then cooled down to room temperature. Dimethyl sulphate (1.3 eq.) was added and the mixture was warmed to 58° C. for 1 hour. The reaction mixture was cooled down to 16° C. and glacial acetic acid (0.1 eq) was added, followed by water and ethyl acetate. The combined organic layers were dried (Na2SO4), filtered and concentrated to an oil which was cromatographed through silica gel (eluent:ethyl acetate:petroleum ether=3:7) to give the desired compound as a 1:1 mixture of two rotamers by 1H NMR
1H NMR (DMSO-d6, 300 MHz, 300 K) δ 8.11–8.08 (m, 2H), 7.80 (t, J=7.7 Hz, 1H), 7.67–7.65 (m, 2H), 7.36–7.10 (m, 5H), 5.50 (dd, J=9.2 and 4.7 Hz, 1H), 5.22 (d, J=12.9 Hz, 0.5H), 5.14–4.95 (m, 1H), 4.93 (d, J=12.3 Hz, 0.5H), 4.16–3.79 (m, 2H), 3.74 (s, 3H), 3.61 (s, 1.5H), 3.45 (s, 1.5H), 3.25–3.11 (m, 1H), 2.89–2.74 (m, 1H). MS: m/z 528 (M+H)+.
Step 11: Benzyl-(2S)-4,4-difluoro-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)pyrrolidine-1-carboxylate




Methyl-5-(benzoyloxy)-2-{(2S)-1-[(benzyloxy)carbonyl]4,4-difluoropyrrolidin-2-yl}-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate in dry MeOH was treated with 4-fluorobenzyl amine (2.5 eq.) at reflux for 2 hours. Solvent was removed in vacuo and the residue was taken up in ethyl acetate, washed with HCl 1N, brine, dried over Na2SO4. The filtrate was concentrated in vacuo and triturated with ethyl ether to obtain the title compound as a 1.5:1 mixture of two rotamers by NMR.
1H NMR (DMSO-d6+TFA, 300 MHz, 300 K) δ 8.92 (bt, 0.4H), 8.69 (bt, 0.6H), 7.36–7.31 (m, 4H), 7.20–7.09 (m, 4H), 6.97 (d, J=7.2 Hz, 1H), 5.34–5.25 (m, 1H), 5.14 (d, J=12.4 Hz, 0.4H ), 5.07–4.99 (m, 1.2H), 4.81 (d, J=12.2 Hz, 0.4H), 4.51–4.48 (m, 2H), 4.38–4.21 (m, 1H), 4.07–3.96 (m, 1H), 3.59 (s, 1.2H),3.48 (s, 1.8H), 3.05–2.95 (m, 1H), 2.78–2.68 (m, 1H).
MS: m/z 517 (M+H)+.
Step 12: (2S)-4,4-difluoro-2-(4-([(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)pyrrolidinium trifluoroacetate




A solution of benzyl-(2S)-4,4-difluoro-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)pyrrolidine-1-carboxylate in MeOH was treated with Pd/C 10% wt (10% w/w) for 3 hours at room temperature under H2 atmosphere. The mixture was filtrated over a celite pad, concentrated in vacuo and treated with trifluoroacetic acid (10 eq.). The acid in excess was removed in vacuo to obtain title product as a pale yellow solid after trituration with ethyl ether.
1H NMR (DMSO-d6+TFA, 300 MHz, 340K) δ 9.60 (bt, 1H), 7.39 (t, J=8 Hz, 2H), 7.17 (t, J=8,8 Hz, 2H), 5.35 (t, J=8.4 Hz, 1H), 4.62 (dd, J=15.3 and 6.6 Hz, 1H), 4.55 (dd, J=15.2 and 6.3 Hz, 1H), 4.05–3.87 (m, 2H), 3.48 (s, 3H), 3.30–3.14 (m, 1H), 2.96–2.78 (m, 1H).
MS: n/z 383 (M+H)+.
Step 13: 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
A solution of (2S)-4,4-difluoro-2-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)pyrrolidinium trifluoroacetate in chloroform and triethylamine (1.01 eq.) was treated with methyl chlorooxacetate (2 eq.) at 0° C. The mixture was allowed to reach room temperature for 2 hours. Dimethylamine (30 eq.) was added at room temperature and the mixture left stirring over night. The mixture was concentrated in vacuo and purified by preparative HPLC (Column: C18, eluent:acetonitrile and water containing 0.1% trifluoroacetic acid). To obtain the title product two rotamers (ratio 4:1) were found in 1H NMR.
1H NMR (DMSO-d6+TFA, 300 MHz, 300 K) δ 9.23 (t, J=6.5 Hz, 0.8H), 9.10 (bt, 0.2H), 7.34–7.31 (m, 2H), 7.11 (t, J=8.8 Hz, 2H), 5.48 (dd, J=8.9 and 5.7 Hz, 1H), 4.53 (dd, J=15.0 and 6.7 Hz, 1H), 4.42 (dd, J=15.0 and 6.2 Hz, 1H), 4.24–4.16 (m, 1H), 4.05–4.02 (t, J=11.8 Hz, 1H), 3.52 (s, 2.4H), 3.45 (s, 0.6H), 3.15–3.04 (m, 1.6H), 2.84 (s, 2.4H), 2.80 (s, 2.4H), 2.79–2.65 (m, 0.4H), 2.63 (s, 0.6H), 2.57 (s, 0.6H).
MS: m/z 482 (M+H)+.
EXAMPLE 21
2-[1,2-dimethyl4-(methylsulfonyl)piperazin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide




Step 1: 1-benzyl 4-tert-butyl 2-cyano-2-methylpiperazine-1,4-dicarboxylate




To a cooled (−75° C.) solution of LDA 2M in heptane/THF (1.5 eq) in THF, a solution of 1-[(benzyloxy)carbonyl]-4-(tert-butoxycarbonyl)piperazine-2-carboxylic acid (Bigge et al, Tetrahedron Lett. 1989, 30: 5193) in THF was added dropwise at −75° C. After being stirred for 1 hour at −75° C., MeI (1.5 eq) was added. After 2 hours at −75°C. the reaction mixture was left warming to r.t., evaporated, diluted with AcOEt, washed with NaHCO3, water, brine and dried over Na2SO4. The crude was purified by flash chromatography on silica gel (petroleum ether/AcOEt, 85:15) to obtain the title compound.
1H NMR (DMSOd6, 340K, 300 MHz) δ 7.45–7.30 (m, 5H), 5.19 (AA′ system, J=13 Hz, 2H), 4.05 (d, J=14 Hz, 1H), 3.87–3.78 (m, 1H), 3.66 (d, J=14 Hz, 1H), 3.62–3.35 (m, 3H), 1.66 (s, 3H), 1.45 (s, 9H).
MS: m/z 360 (M+H)+.
Step 2: 1-benzyl 4-tert-butyl 2-[(Z)-amino({[(1E)-3-methoxy-1-(methoxycarbonyl)-3-oxoprop-1-enyl]oxy}imino)methyl]-2-methyl piperazine-1,4-dicarboxylate




A solution of 1-benzyl 4-tert-butyl 2-cyano-2-methylpiperazine-1,4-dicarboxylate in EtOH was added to a solution of Et3N (3.2 eq) and NH2OH HCl (3 eq) in EtOH. The mixture was stirred 2 hr at 40° C. After evaporation of the solvent, the residue was diluted with AcOEt, washed with water, dried over Na2SO4, filtered and concentrated. The residue was further dissolved in chloroform and dimethylacetylenedicarboxylate (1.5 eq) added to the stirred solution. Reaction was refluxed over night. The mixture was evaporated and the residue was purified by flash chromatography on silica gel (petroleum ether/AcOEt, 65:35) affording the title compound as mixture of isomers in 3.5:1 ratio.
1H NMR (DMSOd6, 340K, 300 MHz). Two sets of signals were observed due to the presence of the geometric isomers-δ 7.48–7.25 (m, 5H), 6.31 (bs, 1.56H), 6.01 (bs, 0.44H), 5.63 (s, 0.78H), 5.55 (s, 0.22H), 5.12–5.02 (m, 2H), 3.85–3.60 (m, 9H), 3.60–3.45 (m, 2H), 3.45–3.31 (m, 1H), 1.51 (s, 2.4H), 1.45 (s, 0.66H), 1.41 (s, 9H).
MS: m/z 535 (M+H)+.
Step3: 1-benzyl 4-tert-butyl 2-[5-(benzoyloxy)-4-hydroxy-6-(methoxycarbonyl)  pyrimidin-2-yl]-2-methylpiperazine-1,4-dicarboxylate




1-benzyl 4-tert-butyl 2-[(Z)-amino({[(1E)-3-methoxy-1-(methoxycarbonyl)-3-oxoprop-1-enyl]oxy}imino)methyl]-2-methylpiperazine-1,4-dicarboxylate was dissolved in xylene and stirred at 155° C. for 8 h. After evaporation of the solvent, the residue was dissolved in pyridine and benzoic anhydride (1.5 eq) was added. The reaction mixture was stirred at room temperature over night, then pyridine was evaporated. The residue was diluted with AcOEt, the organic phase washed with HCl 1N, dried (Na2SO4) and evaporated. The title product was obtained by flash chromatography (eluent:petroleum ether/AcOEt 70/30).
1H-NMR (DMSOd6, 340K, 400 MHz) δ 12.96 (bs, 1H), 8.07 (d, J=7.2 Hz, 2H), 7.76 (t, J=7.6 Hz, 1H), 7.62 (t, J=7.6 Hz, 2H), 7.37–7.22 (m, 5H), 5.03 (s, 2H), 3.96 (dt, J132 13.6 Hz, J2=5.8 Hz, 1H), 3.80–3.52 (m, 7H), 3.47–3.40 (m, 1H), 1.65 (s, 3H), 1.35 (s, 9H).
MS: m/z 607 (M+H)+.
Step 4: 1-benzyl 4-tert-butyl 2-[5-(benzoyloxy)-4-(methoxycarbonyl)-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl]-2-methylpiperazine-1,4-dicarboxylate




1-Benzyl 4-tert-butyl 2-[5-(benzoyloxy)-4-hydroxy-6-(methoxycarbonyl) pyrimidin-2-yl]-2-methylpiperazine-1,4-dicarboxylate was added to a suspension of LiH (1.1 eq) in dioxane (7 ml/mmol) at room temperature. The mixture was stirred at 40° C. for 45 min, then dimethylsulfate (1.3 eq) was added and the temperature was raised to 60° C. After 1 h glacial acetic acid (0.1 eq) was added to the reaction mixture, followed by water (7 ml/mmol) and EtOAc (7 ml/mmol). The aqueous layer was separated and extracted with EtOAc. The combined organic layers were dried (Na2SO4) and concentrated. The crude was purified by flash chromatography on silica gel (AcOEt/petroleum ether, 1:4) to separate the title compound A from B (ratio A/B 1.3/1).
A: 1H NMR (CD3CN, 320K, 300 MHz) δ 8.18 (d, J=7.2 Hz, 2H), 7.80 (t, J=7.5 Hz, 1H), 7.63 (t, J=7.8 Hz, 2H), 7.45–7.22 (m, 5H), 5.08 (AA′ system, J=12 Hz, 2H), 4.18–3.88 (m, 3H), 3.81 (s, 3H), 3.68–3.46 (m, 5H, at 3.58 (s)), 3.40–3.22 (m, 1H), 1.75 (s, 3H), 1.49 (s, 9H).
MS: m/z 621 (M+H)+.
Step 5: Methyl 5-(benzoyloxy)-2-[4-(tert-butoxycarbonyl)-2-methylpiperazin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxylate




1-Benzyl 4-tert-butyl 2-[5-(benzoyloxy)-4-(methoxycarbonyl)-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl]-2-methylpiperazine-1,4-dicarboxylate was dissolved in AcOEt (20 ml/mmol) and hydrogenated at atm pressure on 10% (w/w) Pd/C over night. After filtration of the catalyst, solvent was evaporated to give crude product.
1H NMR (DMSOd6 +TFA, 340K, 400 MHz) δ 8.08 (d, J=7.1 Hz, 2H), 7.787 (t, J=7.4 Hz, 1H), 7.63 (t, J=7.8 Hz, 2H), 4.30 (d, J=15.2 Hz, 1H), 3.90–3.50 (m, 10H), 3.35–3.25 (m, 1H), 1.81 (s, 3H), 1.37 (s, 9H).
MS (EI+) m/z 487 (M+H)+.
Step 6: 2-[1,2-dimethyl4-(methylsulfonyl)piperazin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
Crude methyl 5-(benzoyloxy)-2-[4-(tert-butoxycarbonyl)-2-methylpiperazin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxylate was dissolved in MeOH, p-fluorobenzylamine (3.0 eq) was added and the mixture was refluxed over night. Evaporation of the solvent afforded crude product.
MS: m/z 476 (M+H)+.
Crude obtained in the previous step was dissolved in MeOH (20 ml/mmol) and NaCNBH3 (2.8 eq), AcONa (3.2 eq) and HCHO 37% in H2O (4 eq) were added. The reaction mixture was stirred at room temperature over night, evaporated and the crude solid (4-fluorobenzyl 2-[4-(tert-butoxycarbonyl)-1,2-dimethylpiperazin-2-yl]-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine4-carboxylate) obtained washed with Et2O.
MS (EI+) m/z 490 (M+H)+.
Deprotection of Boc group was carried out in DCM/TFA (1:1, 10 ml/mmol) for 1 hour.
MS (EI+) m/z 390 (M+H)+. The crude product was dissolved in DCM, Et3N (3.3 eq) and MeSO2Cl (2.6 eq) were added and the reaction was stirred at room temperature over night. The reaction mixture was evaporated and the crude residue purified by preparative HPLC (C18, gradient of CH3CN/H2O+0.01% TFA) to obtain the title product.
1H NMR (CD3CN +TFA, 320K, 400 MHz) δ 8.51 (bs, 1H), 7.46–7.36 (m, 2H), 7.15–7.10 (m, 2H), 4.64 (d, J=6.4 Hz, 2H), 4.04 (dd, J1=14.4 Hz, J2=2.2 Hz, 1H), 3.88–3.80 (m, 1H), 3.68 (dt, J1=13.6 Hz, J2=3.3 Hz, 1H), 3.61 (s, 3H), 3.60–3.50 (m, 1H) 3.42–3.31 (m, 2H), 2.94 (s, 3H), 2.81 (s, 3H), 1.92 (s, 3H).
MS: m/z 468 (M+H)+.
Tables 1 and 2 below list compounds of the present invention which have been prepared. The tables provide the structure and name of each compound, the mass of its molecular ion plus 1 (M+) or molecular ion minus 1 (M−) as determined via FIA-MS, and the synthetic scheme employed to prepare the compound. When the compound was prepared as a salt, the identity of the salt is included with the compound name. The synthetic scheme identified as “1*” in Table 1 is identical to Scheme 1 above, except for an additional deprotection step to remove Boc, Cbz, or benzyl present in the 2-substituent in the pyrimidinone ring.











TABLE 1





Exp
Structure
Name
M+
Scheme



















1




N-(2-ethoxybenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide
394
1


 


2




N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide
410
1


 


3




N-(2,3-dimethoxybenzyl)-2-{4-[(dimethylamino)methyl]phenyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
453
3


 


4




N-(4-fluorobenzyl)-2-{4-[(dimethylamino)methyl]phenyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
411
3


 


5




N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-2-[4-(pyrrolidin-1-ylmethyl)phenyl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
479
3


 


6




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-[4-(pyrrolidin-1ylmethyl)phenyl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
437
3


 


7




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-[4-(piperidin-1-ylmethyl)phenyl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
451
3


 


8




N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-2-[4-(morpholin-4-ylmethyl)phenyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
495
3


 


9




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-[4-(morpholin-4-ylmethyl)phenyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
453
3


 


10




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-{4-[(4-methylpiperazin-1-yl)methyl]phenyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
466
3


 


11




2-{4-[(diethylamino)methyl]phenyl}-N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
481
3


 


12




2-{4-[(diethylamino)methyl]phenyl}-N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
439
3


 


13




2-[(dimethylamino)(phenyl)methyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
411
3


 


14




N-(4-fluorobenzyl)-2-[(4-formylpiperazin-1-yl)(phenyl)methyl]-5-hydroxy-1methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
480
3


 


15




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-{phenyl[(pyridin-3-ylmethyl)amino]methyl}-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
474
3


 


16




2-benzyl-1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
425
1


 


17




1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-2-(2-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
425
1


 


18




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(4-methylphenyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide
368
1


 


19




2-benzyl-N-(2,3-dimethoxybenzyl)-1-[2-(dimethylamino)ethyl]-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
467
1


 


20




2-{4-[(4-ethylpiperazin-1-yl)methyl]phenyl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
480
3


 


21




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-{4-[(2-pyridin-3-ylpiperidin-1-yl)methyl]phenyl}-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
528
3


 


22




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
276(M−)
1


 


23




N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
320
1


 


24




N-[4-fluoro-2-(trifluoromethyl)benzyl]-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
(M−)344
1


 


25




N-(3-chloro-4-methylbenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
308
1


 


26




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-carboxamide (TFA salt)
490
3


 


27




N-(4-fluorobenzyl)-5-hydroxy-2(4-{[(2R)-2-(methoxymethyl)pyrrolidin-1-yl]methyl}phenyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
481
3


 


28




N-(4-fluorobenzyl)-5-hydroxy-2(4-{[(2S)-2-(methoxymethyl)pyrrolidin-1-yl]methyl}phenyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
481
3


 


29




N-(4-fluorobenzyl)-2-(4-{[(4-fluorobenzyl)amino]methyl}phenyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
491
3


 


30




2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-1-(2-morpholin-4-ylethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
467
1


 


31




1-[2-(dimethylamino)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
335
1


 


32




N-(4-fluorobenzyl)-5-hydroxy-6oxo-1-(pyridin-3-ylmethyl)-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
355
1


 


33




2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(2-pyrrolidin-1-ylethyl)-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
451
1


 


34




2-benzyl-N-(4-fluorobenzyl)-5-hydroxy-6-oxo-1-(2-piperidin-1-ylethyl)-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
465
1


 


35




2-(1-benzylpiperidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
451
4


 


36




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(1-methylpiperidin-2-yl)-6-oxo-1,6dihydropyrimidine-4-carboxamide (TFA salt)
375
4


 


37




2-(1-benzylpiperidin-3-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
451
4


 


38




1-{3-[(dimethylamino)methyl]benzyl}-N-(4-fluorobenzyl)-5-hydroxy6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
411
3


 


39




N-(2,3-dimethoxybenzyl)-1-[2-(dimethylamino)ethyl]-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
377
1


 


40




N-(2,3-dimethoxybenzyl)-5-hydroxy-6-oxo-1-(pyridin-3-ylmethyl)-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
397
1


 


41




N4-(4-fluorobenzyl)-5-hydroxy-1-methyl-N2-(2-morpholin-4-ylethyl)-6-oxo-1,6-dihydropyrimidine-2,4-dicarboxamide (TFA salt)
434
6


 


42




N-(4-fluorobenzyl)-5-hydroxy-6oxo-1-[3-(pyrrolidin-1-ylmethyl)benzyl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
437
3


 


43




N-(4-fluorobenzyl)-5-hydroxy-1[3-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
453
3


 


44




N-(4-fluorobenzyl)-5-hydroxy-1{3-[(4-methylpiperazin-1-yl)methyl]benzyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
466
3


 


45




N-(4-fluorobenzyl)-5-hydroxy-6oxo-1-{3-[(4-pyridin-2-ylpiperazin-1-yl)methyl]benzyl}1,6-dihydropyrimidine-4-carboxamide (TFA salt)
529
3


 


46




N-(4-fluorobenzyl)-5-hydroxy-1[2-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
453
3


 


47




N-(4-fluorobenzyl)-5-hydroxy-6oxo-1-{2-[(4-pyridin-2-ylpiperazin-1-yl)methyl]benzyl}1,6-dihydropyrimidine-4-carboxamide (TFA salt)
529
3


 


48




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-pyrrolidin-2-yl-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
347
1*


 


49




N4-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-N2-(pyridin-2-ylmethyl)-1,6-dihydropyrimidine-2,4-dicarboxamide (TFA salt)
412
6


 


50




N-(4-fluorobenzyl)-5-hydroxy-1(2-hydroxy-3-morpholin-4-ylpropyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
407
I


 


51




N-(4-fluorobenzyl)-5-hydroxy-1[4-(morpholin-4-ylmethyl)benzyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
453
3


 


52




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(2-morpholin-4-ylethyl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
390.9
7


 


53




2-(2,2-dimethoxyethyl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
366
1


 


54




2-(2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (HCl salt)
395
1*


 


55




2-[2-(4-benzoylpiperazin-1-yl)ethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
494
7


 


56




2-[1-(N,N-dimethylglycyl)piperidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
446
5


 


57




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(1-methyl-2,3-dihydro1H-indol-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (HCL salt)
409
4


 


58




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-(1,2,3,4-tetrahydroquinolin-2-yl)-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
409
1*


 


59




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(1-methyl-1,2,3,4-tetrahydroquinolin-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
423
4


 


60




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
552.8
1


 


61




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
463.2
1*


 


62




2-[(2S,4R)-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
453
1*


 


63




N-(4-fluorobenzyl)-5-hydroxy-2[(2S,4R)-4-hydroxypyrrolidin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (HCl salt)
362.8
1*


 


64




N-(4-fluorobenzyl)-5-hydroxy-2[(2S,4R)-4-hydroxy-1-methylpyrrolidin-2-yl]-1-methyl6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
376.8
4


 


65




2-[(2S,4R)-4-(benzyloxy)-1-methylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
466.6
4


 


66




2-[(2S,4R)-1-benzoyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
557
5


 


67




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 (TFA salt)
480
5


 


68




2-(1-benzoyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
499
5


 


69




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)-2,3-dihydro-1H-indol-2-yl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
500
5


 


70




tert-butyl 3-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-4-methylpiperazine-1-carboxylate(TFA salt)
476
4


 


71




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(4-methylmorpholin-3yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
377
4


 


72




2-(1-ethyl-2,3-dihydro-1H-indol-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
423
4


 


73




2-(1-benzoylpiperidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
465
5


 


74




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)piperidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
466
5


 


75




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(2-methyl-1,2,3,4-tetrahydroisoquinolin-3-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
423
4


 


76




2-(1-benzoylpyrrolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
451
5


 


77




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
452
5


 


78




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(1-methylpyrrolidin-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
361
4


 


79




2-[(2S,4R)-4-(benzyloxy)-1-(pyridin-2-ylcarbonyl)pyrrolidin2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
558
5


 


80




2-[1-(dimethylamino)-2-phenylethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
425
4


 


81




2-[(2S,4R)-1-benzoyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
467
1*


 


82




N-(4-fluorobenzyl)-5-hydroxy-2(1-isobutyl-2,3-dihydro-1H-indol-2-yl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
451
4


 


83




N-(4-fluorobenzyl)-5-hydroxy-2(1-isopropyl-2,3-dihydro-1H-indol-2-yl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
437
4


 


84




2-[1-(N,N-dimethylglycyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
432
5


 


85




2-{1-[(6-bromopyridin-2-yl)carbonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
531
5


 


86




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-(1-methylpiperazin-2-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
376
1*


 


87




2-(1-benzoyl-4-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
480
4


 


88




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-[1-(pyridin-2-ylcarbonyl)-1,2,3,4-tetrahydroquinolin-2-yl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
514
5


 


89




2-(1-acetylpyrrolidin-2-yl)-N-(4fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
389
5


 


90




2-[1-(cyclopropylcarbonyl)pyrrolidin2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
415
5


 


91




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-[1-(methylsulfonyl)pyrrolidin-2-yl]6-oxo-1,6-dihydropyrimidine-4-carboxamide
425
5


 


92




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-{1-[(4-methylmorpholin-3-yl)carbonyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
474
5


 


93




2-(1,4-dimethylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
390
4


 


94




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-[1-(pyridin-3-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
452
5


 


95




2-[(2S,4R)-1-acetyl-4-(benzyloxy)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
495
5


 


96




N-(4-fluorobenzyl)-5-hydroxy-2(1-isonicotinoylpyrrolidin-2-yl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
452
5


 


97




2-{1-[(ethylamino)carbonyl]-pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
418
5


 


98




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-{1-[(1-methyl-1H-imidazol-2-yl)carbonyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
455
5


 


99




2-[(2S,4R)-1-acetyl-4-hydroxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
405
1*


 


100




2-[1-(anilinocarbonyl)pyrrolidin2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
466
5


 


101




2-(4-ethyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
404
4


 


102




N-(4-fluorobenzyl)-5-hydroxy-1methyl-2-{1-[(1-oxidopyridin-2-yl)carbonyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide
468
5


 


103




N-(4-fluorobenzyl)-5-hydroxy-1methyl-6-oxo-2-[1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide (TFA salt)
453
5


 


104




2-[(4R)-3-acetyl-1,3-thiazolidin-4-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
407
5




















TABLE 2





Exp.
STRUCTURE
Name
M + 1
Scheme



















1




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[1-methyl-4-(methylsulfonyl)piperazin-2-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide
454
5


 


2




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(4-methylthiomorpholin-3yl)-6-oxo-1,6-dihydropyrimidine-4-carboxamide
393
4


 


3




N-[4-fluoro-2-(methylsulfonyl)benzyl]-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide
531
1


 


4




2-(1-acetylpyrrolidin-2-yl)-N-[4-fluoro-2-(methylsulfonyl)benzyl]-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
467
1


 


5




2-(3-acetyl-1,3-thiazolidin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
407
1


 


6




2-[1-(acetylamino)-1-methylethyl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
377
1


 


7




2-(1-acetylpyrrolidin-2-yl)-N-(2-ethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
415
1


 


8




2-(4-acetyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihdropyrimidine-4-carboxamide
418
5


 


9




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-[1-methyl-4-(pyrazin-2-ylcarbonyl)piperazin-2-yl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide
482
5


 


10




2-(1-acetylpyrrolidin-2-yl)-5-hydroxy-1-methyl-N-[2-(methylthio)benzyl]-6-oxo-1,6-dihydropyrimidine-4-carboxamide
417
1


 


11




N-(4-fluorobenzyl)-5-hydroxy-2-{1-[(1H-imidazol-5-ylcarbonyl)amino]-1-methylethyl}-1-methyl-6-oxo-1,6-hydropyrimidine-4-carboxamide
429
5


 


12




2-[1-benzoyl-4-(pyrazin-2-ylcarbonyl)piperazin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
572
5


 


13




2-(4-benzoyl-1-methylpiperazin-2-yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
480
5


 


14




2-[4-(benzyloxy)-1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
559
5


 


15




2-(1-acetylpyrrolidin-2-yl)-N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
431
1


 


16




2-(1-acetylpyrrolidin-2-yl)-5-hydroxy-N-(2-methoxybenzyl)-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
401
1


 


17




N-1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl}-N-2-,N-2-dihydropyrimidine-4-carboxamide
434
8


 


18




2-(1-acetylpyrrolidin-2-yl)-N-[2-(dimethylamino)benzyl]-5-hydroxy-1-methyl-6-oxo-1,6dihydropyrimidine-4-carboxamide
414
4


 


19




2-[(2S)-1-acetylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
389
1


 


20




N-(4-fluorobenzyl)-5-hydroxy-2-[4-hydroxy-1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
469
5*


 


21




N-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]imidazo[2,1-b][1,3]thiazole-6-carboxamide
485
5


 


22




2-[(2S,4S)-1-acetyl-4-fluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
407
1


 


23




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-methyl-4-[(1-methyl-1H-imidazol-2-yl)carbonyl]piperazin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide
484
5


 


24




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1-{[(5-methyl-1,3,4-oxadiazol-2-yl)carbonyl]amino}ethyl)-6-oxo-1,6dihyropyrimidine-4-carboxamide
445
5


 


25




N-1-{1-[4-({[4-fluoro-2-(methylsulfonyl)benzyl]amino}carbonyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl]-1-methylethyl}-N-2,N-2-dimethylethanediamide
512
8


 


26




2-(4-acetyl-1,2-dimethylpiperazin-2yl)-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
432
5


 


27




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrimidin-4-ylcarbonyl)pyrrolidin-2-yl]-1,6dihydropyrimidine-4-carboxamide
453
1


 


28




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyrimidin-5-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide
453
1


 


29




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-methyl-1-[(1H-pyrazol5-ylcarbonyl)amino]ethyl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide
429
5


 


30




2-[(2R,4R)-1-acetyl-4-methoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
419
1


 


31




2-{1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
446
8


 


32




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]thiazole-6-carboxamide
563
5


 


33




2-[(2R,4R)-1-benzoyl-4-methoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
481
5*


 


34




N-(4-fluorobenyl)-5-hydroxy-2-[4-(isopropylsulfonyl)-1-methylpiperazin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
482
5


 


35




2-[1,2-dimethyl-4-(methylsulfonyl)piperazin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
468
5


 


36




N-(4-fluorobenzyl)-5-hydroxy-2-[(2S,4R)-4-methoxy-1-methylpyrrolidin-2-yl]-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
391
4


 


37




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[(methylsulfonyl)acetyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide
467
1


 


38




2-[(2S)-1-acetyl-4,4-difluoropyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
425
1


 


39




2-[(2R,4R)-1-acetyl-4-ethoxypyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
433
1


 


40




2-[(2S)-4,4-difluoro-1-methylpyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
397
4


 


41




N-(2,3-dimethoxybenzyl)-5-hydroxy-1-methyl-6-oxo-2-[1-(pyridazin-3-ylcarbonyl)pyrrolidin-2-yl]-1,6-dihydropyrimidine-4-carboxamide
495
1


 


42




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-(1-methyl-1-{[morpholin-4-yl(oxo)acetyl]amino}ethyl)-6-oxo1,6-dihydropyrimidine-4-carboxamide
476
8


 


43




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
476
8


 


44




2-[(2S)-4,4-difluoro-1-(pyrazin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
489
5


 


45




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{(2S,4S)-1-methyl-4-[(methylsulfonyl)amino]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide
454
4


 


46




2-{1-[(dimethylamino)sulfonyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
454
5


 


47




2-{(2R,4R)-4-ethoxy-1-[(methylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
476
8


 


48




2-[(2S)-4,4-difluoro-1-(pyridazin-3-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
489
5


 


49




2-[(2S)-4,4-difluoro-1-(pyridin-2-ylcarbonyl)pyrrolidin-2-yl]-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
488
5


 


50




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
482
8


 


51




N-(4-fluorobenzyl)-5-hydroxy-1-methyl-2-{1-[morpholin-4-yl(oxo)acetyl]pyrrolidin-2-yl}-6-oxo-1,6-dihydropyrimidine-4-carboxamide
488
8


 


52




2-{(2S)-1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
446
8


 


52




2-{(2S)-1-[(dimethylamino)(oxo)acetyl]pyrrolidin-2-yl}-N-(4-fluoro-2-methoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
476
8


 


54




N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N1,N2,N2-trimethylethanediamide
448
8


 


55




2-[(2S)-1-acetylpyrrolidin-2-yl]-N-(4-fluoro-2-methoxybenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
419
1


 


56




N-(4-fluorobenzyl)-2-[(2S,4S)-4-fluoro-1-methylpyrrolidin-2-yl]-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
379
4


 


57




2-{(2S,4S)-1-[(dimethylamino)(oxo)acetyl]-4-fluoropyrrolidin-2-yl}-N-(4-fluorobenzyl)-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidine-4-carboxamide
464
8


 


58




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
468
8









While the foregoing specification teaches the principles of the present invention, with examples provided for the purpose of illustration, the practice of the invention encompasses all of the usual variations, adaptations and/or modifications that come within the scope of the following claims.

## Claims

1. A method for treating infection by HIV or for treating or delaying the onset of AIDS in a subject in need thereof which comprises administering to the subject a therapeutically effective amount of a compound of Formula I:




or a pharmaceutically acceptable salt thereof; wherein
R1 is
(1) —H,
(2) —C1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—C0-6 alkyl-N(RaRb), N(Ra)—C(═O)—C0-6 alkyl-N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), —N(Ra)—C(═O)Rb,






or —N(Ra)C(═O)C(═O)N(RaRb),

(3) —Rk,
(4) —C1-6 alkyl-Rk, wherein:
(i) the alkyl is optionally substituted with one or more substituents each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —N(RaRb), —N(Ra)CO2Rb, —N(Ra)C(═O)—C0-6 alkyl-N(RbRc), or —N(Ra)—C2-6 alkyl-OH with the proviso that the —OH is not attached to the carbon alpha to N(Ra); and
(ii) the alkyl is optionally mono-substituted with —Rs, —C1-6 alkyl-Rs, —N(Ra)—C(═O)—C0-6 alkyl-Rs, —N(Ra)—C0-6 alkyl-Rs, —O—C0-6 alkyl-Rs, or —N(Ra)—C(═)—C0-6 alkyl-Rs; wherein Rs is
(a) aryl which is optionally substituted with one or more substituents each of which is independently halogen, —OH, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl —O—C1-6 alkyl, —O—C1-6 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, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —C(═O)—C0-6 alkyl-N(RaRb), —SO2Ra, oxo, aryl, or —C1-6 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, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, or aryl;


(5) —C0-6 alkyl-O—C0-6 alkyl-Rk,
(6) —C0-6 alkyl-S(O)n—C0-6 alkyl-Rk,
(7) —O—C1-6 alkyl-ORk,
(8) —O—C1-6alkyl-O—C1-6alkyl-Rk,
(9) —O—C1-6 alkyl-S(O)nRk,
(10) —C0-6 alkyl-N(Ra)—Rk,
(11) —C0-6 alkyl-N(Ra)—C1-6 alkyl-Rk,
(12) —C0-6 alkyl-N(Ra)—C1-6 alkyl-ORk,
(13) —C0-6 alkyl-C(═O)-Rk,
(14) —C0-6 alkyl-C(═O)N(Ra)—C0-6 alkyl-Rk,
(15) —C0-6 alkyl-N(Ra)C(═O)—C0-6 alkyl-Rk,
(16) —C0-6 alkyl-N(Ra)C(═O)—O—C0-6 alkyl-Rk, or
(17) —C0-6 alkyl-N(Ra)C(═O)C(═O)Rk;

R2 is —C1-6 alkyl which is optionally substituted with one or more substituents each of which is independently
(1) halogen,
(2) —OH,
(3) —CN,
(4) —O—C1-6 alkyl,
(5) —O—C1-6 haloalkyl,
(6) —C(═O)Ra,
(7) —CO2Ra,
(8) —SRa,
(9) —S(═O)Ra,
(10) —N(RaRb),
(11) —C(═O)N(RaRb),
(12) —N(Ra)—C(═O)—C1-6 alkyl-N(RbRc),
(13) —SO2Ra,
(14) —N(Ra)SO2Rb,
(15) —SO2N(RaRb),
(16) —N(Ra)—C(Rb)═O,
(17) —C3-8 cycloalkyl,
(18) aryl, wherein the aryl is optionally substituted with one or more substituents each of which is independently halogen, —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C0-6 alkyl-N(RaRb), or —C1-6 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 —C1-6 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 —C1-6 alkyl, —O—C1-6 alkyl, oxo, phenyl, or naphthyl;
with the proviso that none of the following substituents is attached to the carbon atom in the —C1-6 alkyl group that is attached to the ring nitrogen: halogen, —OH, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —SRa, —S(═O)Ra, or —N(Ra)—C(Rb)═O;

R3 is —H or —C1-6 alkyl;
R4 is
(1) H,
(2) C1-6 alkyl which is optionally substituted with one or more substituents each of which is independently halogen, —OH, O—C1-6 alkyl, —O—C1-6 haloalkyl, —NO2, —N(RaRb), —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —SO2Ra, or —N(Ra)CO2Rb,
(3) C1-6 alkyl which is optionally substituted with one or more substituents each of which is independently halogen, —OH, or O—C1-4 alkyl, and which is substituted with 1 or 2 substituents each of which is independently:
(i) C3-8 cycloalkyl,
(ii) aryl,
(iii) a fused bicyclic carbocycle consisting of a benzene ring fused to a C5-7 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) C2-5 alkynyl optionally substituted with aryl,
(5) C3-8 cycloalkyl optionally substituted with aryl,
(6) aryl,
(7) a fused bicyclic carbocycle consisting of a benzene ring fused to a C5-7 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 in (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, —C1-6 alkyl, —C1-6 alkyl-ORa, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —CN, —NO2, —N(RaRb), —C1-6 alkyl-N(RaRb), —C(═O)N(RaRb), —C(═0)Ra, —CO2Ra, —C1-6 alkyl-CO2Ra, —OCO2Ra, —SRa, —S(═O)Ra, —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), —N(Ra)C(═O)Rb, —N(Ra)CO2Rb, —C1-6 alkyl-N(Ra)CO2Rb, aryl, —C1-6 alkyl-aryl, —O-aryl, or —C0-6 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 —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, or —CO2Ra;
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, —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6alkyl, —O—C1-6 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, —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, aryl, or —C1-6 alkyl-aryl;


or alternatively R3 and R4 together with the N to which both are attached form a C3-7 azacycloalkyl which is optionally substituted with one or more substituents each of which is independently —C1-6 alkyl or oxo;
each Ra, Rb, Rc and Rd is independently —H or —C1-6 alkyl;
Rk 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) —C1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-2N(RaRb), N(Ra)—C(═O)—(CH2)0-2N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
(5) —O—C1-6 alkyl, which is optionally substituted with one or more substituents each of which is independently halogen, —OH, —CN, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—(CH2)0-2N(RaRb), N(Ra)—C(═O)—(CH2)0-2N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
(6) —NO2,
(7) oxo,
(8) —C(═O)Ra,
(9) —CO2Ra,
(10) —SRa,
(11) —S(═O)Ra,
(12) —N(RaRb),
(13) —C(═O)N(RaRb),
(14) —C(═O)—C1-6 alkyl-N(RaRb),
(15) —N(Ra)C(═O)Rb,
(16) —SO2Ra,
(17) —SO2N(RaRb),
(18) —N(Ra)SO2Rb,
(19) —Rm,
(20) —C1-6 alkyl-Rm, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, —OH, —CN, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —N(Ra)CO2Rb, —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
(21) —C0-6 alkyl-N(Ra)—C0-6 alkyl-Rm,
(22) —C0-6 alkyl-O—C0-6 alkyl-Rm,
(23) —C0-6 alkyl-S—C0-6 alkyl-Rm,
(24) —C0-6 alkyl-C(═O)—C0-6 alkyl-Rm,
(25) —C(═O)—O—C0-6 alkyl-Rm,
(26) —C(═O)N(Ra)—C0-6 alkyl-Rm,
(27) —N(Ra)C(═O)—Rm,
(28) —N(Ra)C(═O)—C1-6 alkyl-Rm, wherein the alkyl is optionally substituted with one or more substituents each of which is independently halogen, —OH, —CN, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —N(Ra)CO2Rb, —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), or —N(Ra)—C(Rb)═O,
(29) —N(Ra)—C(═O)—N(Rb)—C0-6 alkyl-Rm,
(30) —N(Ra)—C(═O)—O—C0-6 alkyl-Rm,
(31) —N(Ra)—C(═O)—N(Rb)—SO2—C0-6 alkyl-Rm,
(32) —C(═O)—C(═O)—N(RaRb),
(33) —C(═O)—C1-6 alkyl-SO2Ra, or
(34) —C(═O)—C(═O)Rm,

carbocycle in Rk is (i) a C3 to C8 monocyclic saturated or unsaturated ring, (ii) a C7 to C12 bicyclic ring system, or (iii) a C11 to C16 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 Rk 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 Rm is independently C3-8 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 Rm is optionally substituted with one or more substituents each of which is independently halogen, —C1-6 alkyl optionally substituted with —O—C1-4 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, —N(RaRb), aryl, or —C1-6 alkyl-aryl; and
the monocyclic or bicyclic heterocycle defined in Rm is optionally substituted with one or more substituents each of which is independently halogen, —C1-6 alkyl, —C1-6 haloalkyl, —O—C1-6 alkyl, —O—C1-6 haloalkyl, oxo, aryl, —C1-6 alkyl-aryl, —C(═O)-aryl, —CO2-aryl, —CO2—C1-6 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.

2. The method according to claim 1, wherein the compound of Formula I is a compound selected from the group consisting of:
N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide;
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-dihydropyrimidine-4-carboxamide;
and pharmaceutically acceptable salts thereof.

3. The method according to claim 2, wherein the compound of Formula I is N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo-1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide or a pharmaceutically acceptable salt thereof.

4. The method according to claim 2, wherein the compound of Formula I is 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-dihydropyrimidine-4-carboxamide or a pharmaceutically acceptable salt thereof.

5. The method according to claim 1, wherein in the compound of Formula I or a pharmaceutically acceptable salt thereof:
R1 is:
(1) —H.
(2) —C1-6 alkyl, which is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —OH, —CN, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —SRa, —S(═O)Ra, —N(RaRb), —C(═O)—C0-4 alkyl-N(RaRb), N(Ra)—C(═O)—C0-4 alkyl-N(RbRc), —SO2Ra, —N(Ra)SO2Rb, —SO2N(RaRb), —N(Ra)—C(═O)Rb,






or —N(R2)C(═O)C(═O)N(RaRb),

(3) —Rk,
(4) —C1-4 alkyl-Rk, wherein:
(i) the alkyl is optionally substituted with from 1 to 4 substituents each of which is independently halogen, —OH, —CN, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —N(RaRb), —N(Ra)CO2Rb, —N(Ra)C(═O)—C0-4 alkyl-N(RbRc), or —N(Ra)—(CH2)2-4—OH; and
(ii) the alkyl is optionally mono-substituted with —Rs, —N(Ra)—C(═O)—C0-4 alkyl-Rs; wherein R2 is
(a) aryl which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, —OH, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl —O—C1-6 alkyl, —O—C1-4 haloalkyl, methylenedioxy attached to two adjacent carbon atoms, or phenyl;
(b) a 5- to 6-membered heterocyclic 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, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, oxo, or phenyl; or
(c) a 5- to 6-membered saturated heteroaromatic 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, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —C1-4 alkyl-N(RaRb), —SO2Ra, oxo, or phenyl,


(5) —(CH2)0-3—C(═O)N(Ra)—(CH2)0-3—Rk,
(6) —C(C1-4 alkyl)2N(Ra)C(═O)Rb,
(7) —C(C1-4 alkyl)2N(Ra)C(═O)Rk, or
(8) —C(C1-4 alkyl)2N(Ra)C(═O)C(═O)N(RbRc).

6. The method according to claim 5, wherein in the compound of Formula I or a pharmaceutically acceptable salt thereof:
R2 is methyl
R3 is —H; and
R4 is —CH2-phenyl, wherein the phenyl is optionally substituted with from 1 to 3 substituents, each of which is independently —F, —Br, —Cl, —OH, —C1-4 alkyl, —C1-4 fluoroalkyl, —O—C1-4 alkyl, —SO2—C1-4 alkyl, —S—C1-4 alkyl, —N(CH3)2, or —O—C1-4 fluoroalkyl.

7. The method according to claim 6, wherein in the compound of Formula I or a pharmaceutically acceptable salt thereof:
Rk 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) —CF3,
(6) —C1-4 alkyl, which is optionally substituted with 1 or 2 substituents each of which is independently —OH, —CN, —O—C1-4 alkyl, —OCF3, —N(RaRb), —C(═O)N(RaRb), or N(Ra)—C(═O)—(CH2)0-2N(RbRc),
(7) —OCF3,
(8) —O—C1-4 alkyl
(9) —C(═O)Ra,
(10) —CO2Ra,
(11) —SRa,
(12) —SRa,
(13) —N(RaRb),
(14) —C(═O)N(RaRb),
(15) —C(═O)—(CH2)1-2—N(RaRb),
(16) —N(Ra)C(═O)Rb, or
(17) —SO2Ra;

(b) the phenyl is optionally mono-substituted with
(1) —(CH2)1-2—Rm, or (2) —(CH2)0-2—N(Ra)—(CH2)0-2—Rm; and

(c) the saturated heterocyclic ring, heteroaromatic ring, or bicyclic heterocycle is optionally mono- or di-substituted with
(1) oxo
(2) —(CH2)1-2—Rm,
(3) —O—(CH2)1-2—Rm, or
(4) —(CH2)0-1—C(═O)—(CH2)0-2—Rm; and



each Rm 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, —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, or —N(RaRb);
the saturated heterocyclic ring is optionally substituted with 1 or 2 substituents each of which is independently —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, oxo, phenyl, —(CH2)1-2-phenyl, —C(═O)-phenyl, —CO2-phenyl, or —C2—CH2-phenyl; and
the heteroaromatic ring is optionally substituted with 1 or 2 substituents each of which is independently —C1-4 alkyl, —CF3, —O—C1-4 alkyl, —OCF3, oxo, phenyl, or —(CH2)1-2-phenyl.

8. The method according to claim 7, wherein in the compound of Formula I or a pharmaceutically acceptable salt thereof:
R1 is:
(1) —H,
(2) —C1-4 alkyl, which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(═O)Ra, —CO2Ra, —N(RaRb), or —C(═O)—(CH2)0-2—N(RaRb),
(3) —Rk,
(4) —(CH2)1-4—Rk, wherein:
(i) the —(CH2)1-4-moiety is optionally substituted with 1 or 2 substituents each of which is independently halogen, —OH, —O—C1-4 alkyl, —O—C1-4 haloalkyl, or —N(RaRb); and
(ii) the —(CH2)14-moiety is optionally mono-substituted with —Rs or —N(Ra)—(CH2)1-2—Rs; wherein Rs is
(a) phenyl which is optionally substituted with from 1 to 3 substituents each of which is independently halogen, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, or —O—C1-4 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, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, or —O—C1-4 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, —C1-4 alkyl, —C1-4 alkyl-ORa, —C1-4 haloalkyl, —O—C1-4 alkyl, —O—C1-4 haloalkyl, —C(=O)Ra, or —CO2Ra,


(5) —C(═O)N(Ra)—(CH2)0-3—Rk,
(6) —C(CH3)2N(Ra)C(═O)Rb,
(7) —C(CH3)2N(Ra)C(═O)Rk, or
(8) —C(CH3)2N(Ra)C(═O)C(═O)N(RbRc).

9. The method according to claim 1, which is a method for treating infection by HIV.

10. The method according to claim 9, which is a method for treating infection by HIV-1.

11. The method according to claim 10, wherein the compound of Formula I is a compound selected from the group consisting of:
N1-[1-(4-{[(4-fluorobenzyl)amino]carbonyl}-5-hydroxy-1-methyl-6-oxo- 1,6-dihydropyrimidin-2-yl)-1-methylethyl]-N2,N2-dimethylethanediamide;
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-dihydropyrimidine-4-carboxamide;
and pharmaceutically acceptable salts thereof.

12. The method according to claim 11, wherein the compound of Formula I is 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-dihydropyrimidine-4-carboxamide or a pharmaceutically acceptable salt thereof.