Substituted pyrazolo[1,5-a]pyrido[3.2-e]pyrimidin-6-one inhibitors of mammalian target of rapamycin

1. A compound of the formula:

wherein the dashed line represents an optional double bond;

R 1 is hydrogen, halo, —C(O)R 5 , C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-8 cycloalkyl, C 3-8 cycloalkenyl, aryl, heteroaryl or heterocyclyl, wherein said alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, heteroaryl and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of R 5 , halo, cyano, C 1-6 alkyl, C 1-6 haloalkyl, (CR y R z ) m OR y , (CR y R z ) m NR y R z , OR y , C(O)R y , C(O)OR y , SO m R y , C(O)NR y R z and NR y R z ;

R 2 is hydrogen, halo, cyano, NR y R z , OR y , C 1-6 alkyl or C 1-6 haloalkyl;

R 3 is C 3-8 cycloalkyl, C 3-8 cycloalkenyl, aryl, heteroaryl or heterocyclyl, O(heterocyclyl), SO m (heterocyclyl), C 1-6 alkyl, (C 1-6 alkyl)NH(R 5 ), (C 1-6 alkyl)NHCOR x , wherein said alkyl, cycloalkyl, cycloalkenyl, aryl, heteroaryl and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of R 5 , halo, cyano, C 1-6 alkyl, C 1-6 haloalkyl, OR y , O(C 1-6 haloalkyl), OR x OR y , C(O)R y , C(O)OR y , C(O)CR x R y R z , SO m R y , NR y R z , C(O)NR y R z , C(O)heteroaryl and NHCOR y ;

or R 3 is

wherein X is absent, CR y R z , O, C(O), NR y R z or SO m ;

Y is absent, CR y R z , O, C(O), NR y R z or SO m ;

or X & Y are part of 3-8 membered ring wherein said ring is selected from the group consisting of aryl, heteroaryl, cycloalkyl or heterocyclyl;

U is CR y or N;

W is CR y , N, O or SO m ;

L is absent, (CR y R z ) n , O(CR y R z ) n , C(O)(CR y R z ) n , (CR y R z ) n NHCR y R z , NR y (CR y R z ) n or SO m (CR y R z ) n ;

T is absent, (CR y R z ) n , O(CR y R z ) n , C(O)(CR y R z ) n , (CR y R z ) n NHCR y R z , NR y (CR y R z ) n or SO m (CR y R z ) n ;

Z is absent, (CR y R z ) n , O(CR y R z ) n , C(O)(CR y R z ) n , (CR y R z ) n NHCR y R z , NR y (CR y R z ) n or SO m (CR y R z ) n ;

R 4 is hydrogen, halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-8 cycloalkyl, C 3-8 cycloalkenyl, aryl, heteroaryl or heterocyclyl, wherein said alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, heteroaryl, and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of R 5 , halo, cyano, C 1-6 alkyl, C 1-6 haloalkyl, OR y , O(C 1-6 haloalkyl), C(O)R y , C(O)OR y , SO m R y , C(O)NR y R z and NR y R z ;

R 5 is C 3-8 cycloalkyl, C 3-8 cycloalkenyl, aryl, heteroaryl or heterocyclyl, wherein said cycloalkyl, cycloalkenyl, aryl, heteroaryl and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of halo, cyano, C 1-6 alkyl, C 1-6 haloalkyl, OR y , O(C 1-6 haloalkyl), C(O)R y , C(O)OR y , SO m R y and NR y R z ;

R x is hydrogen or C 1-6 alkyl;

R y is hydrogen, C 1-6 alkyl or C 1-6 haloalkyl, wherein said alkyl group is optionally substituted with one to three hydroxyl;

R z is hydrogen, C 1-6 alkyl or C 1-6 haloalkyl, wherein said alkyl group is optionally substituted with one to three hydroxyl;

m is 0, 1 or 2;

n is 0, 1 or 2;

p is 0, 1, 2, 3 or 4;

q is 0, 1, 2, 3 or 4;

or a pharmaceutically acceptable salt thereof.

2. The compound of claim 1 wherein

R 1 is aryl or heteroaryl, wherein said aryl and heteroaryl groups are optionally substituted with one to three substituents independently selected from the group consisting of R 5 , halo, cyano, C 1-6 alkyl, C 1-6 haloalkyl, OR y , C(O)R y , C(O)OR y , SO m R y and NR y R z ;

R 2 is hydrogen or halo;

R 3 is C 3-8 cycloalkyl, C 3-8 cycloalkenyl, aryl, heteroaryl or heterocyclyl, wherein said cycloalkyl, cycloalkenyl, aryl, heteroaryl and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of halo, cyano, C 1-6 alkyl, C 1-6 haloalkyl and OR y ;

or R 3 is

wherein X is absent, CR y R z , O or C(O);

Y is absent, CR y R z , O, or C(O);

L is absent or (CR y R z ) n ;

T is absent or (CR y R z ) n ;

Z is absent or (CR y R z ) n ;

R 4 is hydrogen, halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-8 cycloalkyl, C 3-8 cycloalkenyl, aryl, heteroaryl or heterocyclyl, wherein said alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, heteroaryl and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of halo, hydroxyl, cyano, C 1-6 alkyl, C 1-6 haloalkyl, and SO m R y ;

R 5 is C 3-8 cycloalkyl, C 3-8 cycloalkenyl, aryl, heteroaryl or heterocyclyl, wherein said cycloalkyl, cycloalkenyl, aryl, heteroaryl and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of halo, cyano, C 1-6 alkyl, C 1-6 haloalkyl, OR y , O(C 1-6 haloalkyl), C(O)R y , C(O)OR y , SO m R y and NR y R z ;

or a pharmaceutically acceptable salt thereof.

3. The compound of claim 2 wherein R 1 is aryl or heteroaryl, wherein said aryl and heteroaryl groups are optionally substituted with one to three substituents independently selected from the group consisting of R 5 , halo, C 1-6 alkyl and OR y ; or a pharmaceutically acceptable salt thereof.

4. The compound of claim 3 wherein R 2 is hydrogen, or a pharmaceutically acceptable salt thereof.

5. The compound of claim 4 wherein R 3 is heteroaryl or heterocyclyl, wherein said heteroaryl and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of halo, cyano, C 1-6 alkyl, C 1-6 haloalkyl and OR y ;

or R 3 is

wherein X is absent, CR y R z , O or C(O);

Y is absent, CR y R z , O, or C(O);

L is absent or (CR y R z ) n ;

T is absent or (CR y R z ) n ;

Z is absent or (CR y R z ) n ;

or a pharmaceutically acceptable salt thereof.

6. The compound of claim 5 wherein R 4 is hydrogen, halo, C 1-6 alkyl, aryl, heteroaryl or heterocyclyl, wherein said alkyl, aryl, heteroaryl and heterocyclyl groups are optionally substituted with one to three substituents independently selected from the group consisting of halo, hydroxyl, cyano, C 1-6 alkyl, C 1-6 haloalkyl, and SO m R y ; or a pharmaceutically acceptable salt thereof.

7. The compound of claim 6 wherein R 5 is aryl or heteroaryl, wherein said aryl or heteroaryl groups are optionally substituted with one to three substituents independently selected from the group consisting of halo, C 1-6 alkyl, C 1-6 haloalkyl and OR y , or a pharmaceutically acceptable salt thereof.

8. The compound of claim 1 selected from:

or stereoisomer thereof,

or a pharmaceutically acceptable salt thereof,

or a pharmaceutically acceptable salt of the steroeisomer thereof.

9. A pharmaceutical composition comprising a pharmaceutically effective amount of the compound according to claim 1 , and a pharmaceutically acceptable carrier.

10. A method for modulating mammalian target of rapamycin kinase activity in a mammal comprising the step of administering the compound of claim 1 .