Modulators of cell cycle checkpoints and their use in combination with checkpoint kinase inhibitors

1. A compound or a pharmaceutically acceptable salt thereof, said compound being represented by Formula V:

wherein:

G is H or halo;

X is selected from the group consisting of H, F, OR 2 and alkyl;

Y is selected from the group consisting of H, F, OR 2 and alkyl; with the proviso that when X═Y═OR 2 , R 2 cannot be H;

the “A” ring moiety:

 refers to a 5-7 membered heterocyclyl ring or a 5-7 membered heterocyclenyl ring and the N atom signifies a nitrogen atom on the ring moiety A, said heterocyclyl and heterocyclenyl ring containing 1-2 heteroatoms independently selected from O, S and N including the N atom shown in the ring moiety A, wherein said N atom shown in ring moiety A is the point of attachment of ring moiety A to the moiety:

 in Formula V, further wherein each of said heterocyclyl and heterocyclenyl ring independently is:

(i) either unsubstituted, or

(ii) optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), —NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl, or

(iii) optionally independently fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heterocyclenyl ring of A and each of said fused aryl, heteroaryl and heterocyclyl ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl, or

(iv) both (a) optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl, and (b) optionally independently fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heterocyclenyl ring of A and each of said fused aryl, heteroaryl and heterocyclyl ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), —NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl,

provided that when the “A” ring moiety:

 is pyridine, the “A” ring moiety:

 is fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heterocyclenyl ring of A and each of said fused aryl, heteroaryl and heterocyclyl ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH (aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocycly), —N(heterocycly) 2 , heterocyclyl and heterocyclylalkyl;

R 2 is selected from the group consisting of H, -alkyl, -aryl and -heteroaryl, wherein each of said alkyl, aryl and heteroaryl can be unsubstituted or optionally independently substituted with one or more groups which can be the same or different and are independently selected from the group consisting of halo, cyano, alkyl, alkenyl, alkynyl, hydroxyl, alkoxy, aryloxy, alkylthio, arylthio, aryl, heteroaryl, heterocyclyl, heterocyclenyl, cycloalkyl, cycloalkenyl, —OH, alkoxy, aryloxy, heteroaryloxy, —NHR 4 , —NR 4 R 5 , —C(O)H, —C(O)alkyl, —C(O)aryl, —C(O)heteroaryl, —C(O)NHR 4 , —C(O)NR 4 R 5 ; or

R 4 and R 5 in —NR 4 R 5 can be connected to the N of said —NR 4 R 5 to form a 5-8 membered heterocyclyl ring containing 1-3 heteroatoms including the N of said —NR 4 R 5 , and independently R 4 and R 5 in said —C(O)NR 4 R 5 can be connected to the N of said —C(O)NR 4 R 5 to form a 5-8 membered heterocyclyl ring containing 1-3 heteroatoms including the N of said —C(O)NR 4 R 5 ;

R 4 is selected from the group consisting of H, -alkyl, -aryl and -heteroaryl, wherein each of said alkyl, aryl and heteroaryl can be unsubstituted or optionally independently substituted with one or more groups which can be the same or different and are independently selected from the group consisting of halo, cyano, alkyl, alkenyl, alkynyl, hydroxyl, alkoxy, aryloxy, alkylthio, arylthio, aryl, heteroaryl, heterocyclyl, heterocyclenyl, cycloalkyl, cycloalkenyl, —OH, —OR 6 , —NHR 6 , —N(alkyl)R 6 , —N(aryl)R 6 , —N(heteroaryl)R 6 , —C(O)H, —C(O)R 6 , —C(O)NHR 6 , —C(O)N(alkyl)R 6 , —C(O)N(aryl)R 6 , and —C(O)N(heteroaryl)R 6 ;

R 5 is selected from the group consisting of H, -alkyl, -aryl and -heteroaryl, wherein each of said alkyl, aryl and heteroaryl can be unsubstituted or optionally independently substituted with one or more groups which can be the same or different and are independently selected from the group consisting of halo, cyano, alkyl, alkenyl, alkynyl, hydroxyl, alkoxy, aryloxy, alkylthio, arylthio, aryl, heteroaryl, heterocyclyl, heterocyclenyl, cycloalkyl, cycloalkenyl, —OH, —OR 7 , —NHR 7 , —N(alkyl)R 7 , —N(aryl)R 7 , —N(heteroaryl)R 7 , —C(O)H, —C(O)R 7 , —C(O)NHR 7 , —C(O)N(alkyl)R 7 , —C(O)N(aryl)R 7 and —C(O)N(heteroaryl)R 7 ;

R 6 is selected from the group consisting of -alkyl, -aryl and -heteroaryl; and

R 7 is selected from the group consisting of -alkyl, -aryl and -heteroaryl.

2. The compound of claim 1 , wherein the moiety:

is:

wherein the pyrrolidinyl ring can be:

(i) unsubstituted or

(ii) optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkoxy, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl, or

(iii) optionally independently fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heterocyclenyl ring of A and said aryl, heteroaryl and heterocyclyl fused ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkoxy, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl or

(iv) both (a) optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl, and (b) in addition, optionally independently fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heterocyclenyl ring of A and each of said fused aryl, heteroaryl and heterocyclyl ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl.

3. The compound of claim 1 , wherein the moiety:

is:

wherein the piperidinyl ring is:

fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heteorcyclenyl ring of A and said aryl, heteroaryl and heterocyclyl fused ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkoxy, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl.

4. The compound of claim 1 , wherein the moiety:

is:

wherein the piperazinyl ring can be:

(i) unsubstituted or

(ii) optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkoxy, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl, or

(iii) optionally independently fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heteorcyclenyl ring of A and said aryl, heteroaryl and heterocyclyl fused ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkoxy, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl or

(iv) both (a) optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl, and (b) in addition, optionally independently fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heterocyclenyl ring of A and each of said fused aryl, heteroaryl and heterocyclyl ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl.

5. The compound of claim 1 , wherein the moiety:

is:

wherein the morpholinyl ring can be:

(i) unsubstituted or

(ii) optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkoxy, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl, or

(iii) optionally independently fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heteorcyclenyl ring of A and said aryl, heteroaryl and heterocyclyl fused ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkoxy, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl or

(iv) both (a) optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl, and (b) in addition, optionally independently fused with an aryl, heteroaryl or heterocyclyl ring, wherein each of said heterocyclyl and heterocyclenyl ring of A and each of said fused aryl, heteroaryl and heterocyclyl ring can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different and are independently selected from halo, CN, hydroxy, alkyl, alkenyl, haloalkyl, cycloalkyl, aryl, arylalkyl, alkylaryl, alkoxy, alkoxyalkyl, hydroxyalkyl, aryloxy, aryloxyalkyl, heteroaryl, heteroarylalkyl, —NH 2 , —NH(alkyl), —N(alkyl) 2 , —NH(aryl), —N(aryl) 2 , —N(alkyl)(aryl), —N(alkyl)(heterocyclyl), —N(aryl)(heterocyclyl), —NH(heteroaryl), —N(heteroaryl) 2 , —N(alkyl)(heteroaryl), —N(heteroaryl)(heterocyclyl), NH(heterocyclyl), —N(heterocyclyl) 2 , heterocyclyl and heterocyclylalkyl.

6. The compound of claim 1 , wherein the ring moiety A is

7. The compound of claim 1 , wherein the ring moiety A is

8. The compound of claim 1 , wherein the ring moiety A is

9. The compound of claim 1 , wherein the ring moiety A is

10. The compound of claim 1 , wherein the ring moiety A is

11. The compound of claim 1 , wherein the ring moiety A is

12. A compound selected from the group consisting of:

or a pharmaceutically acceptable salt thereof.

13. A pharmaceutical composition comprising a compound of claim 1 or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.

14. A compound selected from the group consisting of: