Pyrazolopyridines as cyclin dependent kinase inhibitors

1. compound represented by the structural formula:

wherein:

R is selected from the group consisting of alkyl, aryl, heteroaryl, heteroarylalkyl, heterocyclyl, heterocyclylalkyl, arylalkyl, cycloalkyl, —NR 6 R 7 , —C(O)R 7 , —C(O)OR 6 , —C(O)NR 6 R 7 and —S(O 2 )R 7 , wherein each of said alkyl, aryl, heteroaryl, heteroarylalkyl, heterocyclyl, heterocyclylal kyl, cycloalkyl and arylalkyl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, CF 3 , CN, —OCF 3 , —OR 6 , —C(O)R 7 , —NR 6 R 7 , —C(O)OR 6 , —C(O)NR 6 R 7 , —SR 6 , —S(O 2 )R 7 , —S(O 2 )NR 6 R 7 , —N(R 5 )S(O 2 )R 7 , —N(R 6 )C(O)R 8 and —N(R 5 )C(O)NR 6 R 7 and NO 2 ;

R 2 is selected from the group consisting of hydrogen, halogen, CN, —C(O)OR 6 , —C(O)NR 5 R 10 , —OR 6 , —C(O)R 7 , —SR 6 , —S (O 2 )R 7 , —S(O 2 )NR 6 R 10 , —N(R 5 )S(O)R 7 , —N(R 5 )C(O)R 7 and —N(R 5 )C(O)NR 5 R 10 , alkyl, alkenyl, alkynyl, alkenylalkyl, alkynylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl, heterocyclylalkyl, cycloalkyl, cycioalkylalkyl, —CF 3 , —C(O)R 7 , —C(O)OR 6 , —C(O)NR 5 R 6 , alkyl substituted with 1–6 R 9 groups which groups can be the same or different with each R 9 being independently selected,

wherein each of said aryl, heteroaryl, arylalkyl and heterocyclyl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, cycloalkyl, CF 3 , CN, —OCF 3 , —OR 6 , —C(O)R 7 , —NR 6 R 7 , —C(O)OR 6 , —C(O)NR 5 R 6 , —SR 6 , —S(O 2 )R 7 , —S(O 2 )NR 5 R 6 , —N(R 5 )S(O 2 )R 7 , —N(R 5 )C(O)R 7 and —N(R 5 )C(O)NR 5 R 6 ;

R 3 is selected from the group consisting of H, halogen, —NR 5 R 6 , CF 3 , alkyl, cycloalkyl, aryl, alkynyl, alkenyl, —(CHR 5 ) n —aryl, —(CHR 5 ) n —OR 6 , —S(O 2 )R 6 , —C(O)R 6 , —S(O 2 )NR 5 R 6 , —C(O)OR 6 , —C(O)NR 5 R 6 , —CH(aryl) 2 , and —(CH 2 ) m —NR 8 ,

wherein each of said aryl, alkyl, arylalkyl, and cycloalkyl can be substituted or optionally independently substituted with one or more moieties which moieties can be the same or different, each moiety being independently selected from the group consisting of halogen, aikyl, aryl, cycloalkyl, CF 3 , CN, —CF 3 , —OR 5 , —C(R 4 R 5 ) n —OR 5 , —NR 5 R 6 , —C(R 4 R 5 ) n NR 5 R 6 , —C(O 2 )R 5 , —C(O)R 5 , —C(O)NR 5 R 6 , —SR 6 , —S(O 2 )R 6 , —S(O 2 ) NR 5 R 6 , —N(R 5 )S(O 2 )R 7 , —N(R 5 )C(O)R 7 and —N(R 5 )C(O)NR 6 R 8 ;

R 4 is selected from the group consisting of H, halogen, CF 3 , alkyl, cycloalkyl, aryl, heterosryl, heteroarylalkyl, heterocyclyl, heterocyclylalkyl, alkynyl, alkenyl, —(CHR 5 ) n —aryl, —(CHR 5 ) n —heteroaryl, —(CHR 5 )OR 6 , —S(O 2 )R 6 , —C(O)R 6 , —S(O 2 )NR 5 R 6 , —C(O)OR 6 , —C(O)NR 5 R 6 , cycloalkyl, —CH(aryl) 2 , —(CH 2 ) m —NR 8 , and

wherein each of said aryl, alkyl, cycloalkyl, heteroaryl, heteroarylaikyl, heterocyclyl and heterocyclylalkyl can be substituted or optionally substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, aryl, cycloalkyl, CF 3 , CN, —OCF 3 , —OR 5 , —NR 5 R 6 , —C(O 2 )R 5 , —C(O)NR 5 R 6 , —SR 6 , —S(O 2 )R 6 , —S(O 2 )NR 5 R 6 , —N(R 5 )S(O 2 )R 7 , —N(R 5 )C(O)R 7 and —N(R 5 )C(O)NR 5 R 6 ;

R 5 is H, alkyl or aryl;

R 6 is selected from the group consisting of H, alkyl, aryl, heteroaryl, arylalkyl, cycloalkyl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl, wherein each of said alkyl, aryl, heteroaryl, arylalkyl, cycloalkyl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, aryl, cycloalkyl, heterocyclylalkyl, CF 3 , OCF 3 , CN, —OR 5 , —NR 5 R 10 , —N(R 5 )Boc, —C(R 4 R 5 ) OR 5 , —C(O)R 6 , —C(O)OR 5 , —C(O)NR 5 R 10 , —SO 3 H, —SR 10 , —S(O 2 )R 7 , —S(O 2 )NR 5 R 10 , —N(R 5 )S(O 2 )R 7 , —N(R 5 )C(O)R 7 and —N(R 5 )C(O)NR 5 R 10 ;

R 10 is selected from the group consisting of H, alkyl, aryl, arylalkyl, cycloalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl, and heteroarylalkyl, wherein each of said alkyl, aryl, arylalkyl, cycloalkyl. heterocyclyl, heterocyclylalkyl, heteroaryl, and heteroarylalkyl can be unsubstituted or optionally substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, aryl, cycloalkyl, heterocyclylalkyl, CF 3 , OCF 3 , CN, —OR 5 , —NR 4 R 5 , —N(R 5 )Boc, —(CR 4 R 5 ) n OR 5 , —C(O 2 )R 5 , —C(O)NR 4 R 5 , —C(O)R 5 , —SO 3 H, —SR 5 , —S(O 2 )R 7 , —S(O 2 )NR 4 R 5 , —N(R 5 )S(O 2 )R 7 , —N(R 5 )C(O)R 7 and —N(R 5 )C(O)NR 4 R 5 ;

or optionally (i) R 5 and R 10 in the moiety —NR 5 R 10 , or (ii) R 5 and R 6 In the moiety —NR 5 R 6 , may be joined together to form a cycloalkyl or heterocyclyl moiety, with each of said cycloalkyl or heterocyclyl moiety being unsubstituted or optionally independently being substituted with one or more R 9 groups;

R 7 is selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl, arylalkyl and heteroarylalkyl wherein each of said alkyl, cycloalkyl, heteroarylalkyl, aryl, heteroaryl and arylalkyl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, aryl, cycloalkyl, CF 3 , OCF 3 , CN, —OR 5 , —NR 5 R 10 , —CH 2 OR 5 , —C(O 2 )R 5 , —C(O) NR 5 R 10 , —C(O)R 5 , —SR 10 , —S(O 2 )R 10 , —S(O 2 )NR 5 R 10 , —N(R 5 )S(O 2 )R 10 , —N(R 5 )C(O)R 10 and —N(R 5 )C(O)NR 5 R 10 ;

R 8 is selected from the group consisting of R 6 , —C(O)NR 5 R 10 , —S(O 2 )NR 5 R 10 , —C(O)R 7 , —C(O)OR 6 and S(O 2 )R 7 ;

R 9 is selected from the group consisting of halogen, CN, NR 5 R 10 , —C(O)OR 6 , —C(O)NR 6 R 10 , —OR 6 , —C(O)R 7 , —SR 6 , —S(O 2 )R 7 , —S(O 2 )NR 5 R 10 , —N(R 5 )S(O 2 )R 7 , —N(R 5 )C(O)R 7 and —N(R 5 )C(O)NR 5 R 10 ;

R 11 is H, alkyl, or aryl;

m is 0 to 4; and

n is 1–4.

2. The compound of claim 1 R is selected from the group consisting of aryl, heteroaryl, alkyl, arylalkyl, heteroarylalkyl, —S(O 2 )R 7 and —C(O)R 7 , wherein each of said alkyl. aryl and heteroaryl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, CF 3 , CN, —OCF 3 , —NR 6 R 7 , —NR 6 C(O)R 8 and —OR 6 ; and R 7 is alkyl, phenyl or pyridyl, with each of said alkyl, phenyl and pyridyl for R 7 being unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, CN, CF 3 , alkyl, —S(O 2 )R 7 , —S(O 2 )NR 6 R 7 , —N(R 5 )S(O 2 )R 7 , and —N(R 6 )C(O)R 8 ;

R 2 is selected from the group consisting of H, halogen, alkyl, alkynyl, alkenyl, aryl, heteroaryl and —C(O)R 7 , wherein each of said alkyl, alkynyl, alkenyl, aryl and heteroaryl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, CF 3 , CN, —OCF 3 , and —OR 6 ;

R 3 is selected from the group consisting of H, aryl, —(CHR 5 ) n —aryl, —(CHR 5 ) n —OR 6 , —C(O)R 6 , cycloalkyl,

wherein each of said aryl, and cycloalkyl can be substituted or optionally independently substituted with one or more moieties which can be 10 the same or different, each moiety being independently selected from the group consisting of halogen, CF 3 , OCF 3 , alkyl, CN, aryl, —C(O)R 5 , —C(O 2 )R 5 , —S(O 2 )R 6 , —C(═NH)—NH 2 , —C(═CN)—NH 2 , hydroxyalkyl, alkoxycarbonyl, —SR 6 , and OR 5 , with the proviso that no carbon adjacent to a nitrogen atom on a heterocyclyl ring carries a —OR 5 moiety;

R 4 is selected from the group consisting of H, alkyl, aryl, heteroaryl, —(CHR 5 ) n —aryl, —(CHR 5 ) n —heteroaryl, —(CHR 5 ) n —OR 6 , —C(O)R 5 , cycloalkyl, —CH(aryl) 2 and

wherein each of said aryl and heteroaryl can be substituted or optionally substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of halogen, alkyl, aryl, CF 3 , CN, —C(O 2 )R 5 and —S(O 2 )R 6 ;

R 5 is R 5 is H, aryl or lower alkyl;

R11 is H or lower alkyl;

m is 0 to 2, and

n is I to 3.

3. The compound of claim 2 , wherein R is selected from the group consisting of phenyl, pyridyl, pyrazinyl, pyridazinyl, pyrimidinyl, benzyl, pyridylmethyl, pyrazinylmethyl, pyridazinylmethyl, pyrimidinylmethyl, —S(O 2 )aryl, —S(O 2 )heteroaryl, —S(O 2 )alkyl, —C(O)alkyl, —C(O)aryl, and —C(O)heteroaryl, wherein each of said phenyl, pyridyl, pyrazinyl, pyridazinyl, pyrimidinyl, alkyl, aryl and heteroaryl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of Cl, Br, I, lower alkyl, CF 3 , CN, —C(O)OR , —OCF 3 , —N(H)C(O)alkyl, alkoxy and —OH.

4. The compound of claim 3 , wherein R is unsubstituted phenyl, unsubstituted pyridyl, benzyl whose phenyl can be unsubstituted or optionally independently substituted with one or more moieties selected from the group consisting of F, Cl, Br, CN, CF 3 , and —N(H)C(O)CH 3 , pyridylmethyl whose pyridyl can be unsubstituted or optionally independently substituted with one or more moieties selected from the group consisting of F, Cl, Br, CN, CF 3 , and —N(H)C(O)CH 3 , phenylsulfonyl whose phenyl can be unsubstituted or optionally substituted with one or more moieties selected from the group consisting of F, Cl, Br, CN, —N(H)C(O)CH 3 and CF 3 , or pyridylsulfonyl whose pyridyl can be unsubstituted or optionally substituted with one or more moieties selected from the group consisting of F, Cl, Br, CN,—N(H)C(O)CH 3 and CF 3 .

5. The compound of claim 4 , wherein R is benzyl whose phenyl is substituted with one or more moieties selected from the group consisting of F, Cl, Br, CN, —N(H)C(O)CH 3 and CF 3 .

6. The compound of claim 3 , wherein R is pyridylmethyl whose pyridyl is substituted with one or more moieties selected from the group consisting of F, Cl, Br, CN,—N(H)C(O)CH 3 and CF 3 .

7. The compound of claim 3 , wherein R is pyrimidinylmethyl.

8. The compound of claim 2 , wherein R 2 is H, F, Cl, Br, hydroxyalkyl, or lower alkyl.

9. The compound of claim 8 , wherein R 2 is H, Cl, Br, hydroxymethyl or methyl.

10. The compound of claim 2 , wherein R 3 is H, alkyl, aryt, or —NR 5 R 6 ,

wherein said alkyl and aryl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of F, Cl, Br, CF 3 , lower alkyl, hydroxyalkyl, alkoxy, —S(O 2 )R 6 , and CN.

11. The compound of claim 2 , wherein R 4 is H, alkyl or aryl, wherein said alkyl or aryl can be unsubstituted or optionally independently substituted with one or more moieties which can be the same or different, each moiety being independently selected from the group consisting of F, Cl, Br, CF 3 , lower alkyl, hydroxyalkyl, alkoxy, —S(O 2 )R 6 , and CN.

12. The compound of claim 2 , wherein R 5 is H.

13. The compound of claim 2 , wherein m is 0.

14. The compound of claim 2 , wherein n is 1.

15. A compound of the formula:

or a pharmaceutically acceptable salt or solvate thereof.

16. A compound of the formula:

or a pharmaceutically acceptable salt or solvate thereof.

17. A compound of claim 1 , in isolated and purified form.

18. A pharmaceutical composition comprising a therapeutically effective amount of at least one compound of claim 1 in combination with at least one pharmaceutically acceptable carrier.