Novel pyrazolopyrimidines as cyclin dependent kinase inhibitors

A compound represented by the structural formula:

• or a pharmaceutically acceptable salt thereof,
• wherein:
• R is heteroaryl, wherein said 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, aryl, cycloalkyl, CF3, OCF3, CN, —OR5, —NR5R6, —C(R4R5)nOR5, —C(O2)R5, —C(O)R5, —C(O)NR5R6, —SR6, —S(O2)R7, —S(O2)NR5R6, —N(R5)S(O2)R7, —N(R5)C(O)R7 and —N(R5)C(O)NR5R6;
• R2 is selected from the group consisting of R9, alkyl, alkynyl, aryl, heteroaryl, CF3, heterocyclylalkyl, alkynylalkyl, cycloalkyl, —C(O)OR4, alkyl substituted with 1-6 R9 groups which can be the same or different and are independently selected from the list of R9 shown later below,
• wherein the aryl in the above-noted definitions for R2 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, CN, —OR5, SR5, —CH2OR5, —C(O)R5, —SO3H, —S(O2)R6, —S(O2)NR5R6, —NR5R6, —C(O)NR5R6, —CF3, and —OCF3;
• R3 is selected from the group consisting of H, halogen, —NR5R6, —C(O)OR4, —C(O)NR5R6, alkyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl,
• wherein each of said alkyl, cycloalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl for R3 and the heterocyclyl moieties whose structures are shown immediately above for R3 can be substituted 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, CF3, CN, —OCF3, —(CR4R5)nOR5, —OR5, —NR5R6, —(CR4R5) NR5R6, —C(O2)R5, —C(O)R5, —C(O)NR5R6, —SR6, —S(O2)R6, —S(O2)NR5R6, —N(R5)S(O2)R7, —N(R5)C(O)R7 and —N(R5)C(O)NR5R6;
• R4 is H, halo or alkyl;
• R5 is H or alkyl;
• R6 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, CF3, OCF3, CN, —OR5, —NR5R10, —N(R5)Boc, —(CR4R5)nOR5, —C(O2)R5, —C(O)R5, —C(O)NR5R10, —SO3H, —SR10, —S(O2)R7, —S(O2)NR5R10, —N(R5)S(O2)R7, —N(R5)C(O)R7 and —N(R5)C(O)NR5R10;
• R10 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, CF3, OCF3, CN, —OR5, —NR4R5, —N(R5)Boc, —(CR4R5)nOR5, —C(O2)R5, —C(O)NR4R5, —C(O)R5, —SO3H, —SR5, —S(O2)R7, —S(O2)NR4R5, —N(R5)S(O2)R7, —N(R5)C(O)R7 and —N(R5)C(O)N R4R5;
• or optionally (i) R5 and R10 in the moiety —NR5R10, or (ii) R5 and R6 in the moiety —NR5R6, 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 R9 groups;
• R7 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 for R7 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, CF3, OCF3, CN, —OR5, —NR5R10, —CH2OR5, —C(O2)R5, —C(O)NR5R10, —C(O)R5, —SR10, —S(O2)R10, —S(O2)NR5R10, —N(R5)S(O2)R10, —N(R5)C(O)R10 and —N(R5)C(O)NR5R10;
• R8 is selected from the group consisting of R6, —C(O)NR5R10, —CH2OR4, —C(O)OR6, —C(O)R7 and —S(O2)R7;
• R9 is selected from the group consisting of halogen, —CN, —NR5R6, —(CH2)nOR4, —C(O2)R6, —C(O)NR5R6, —OR6, —SR6, —S(O2)R7, —S(O2)NR5R6, —N(R5)S(O2)R7, —N(R5)C(O)R7 and —N(R5)C(O)N R5R6;
• m is 0 to 4;
• and
• n is 1 to 4.