Inhibitors of Janus kinases

1. A compound of the formula

wherein W is N or CR 3 ;

R 1 is substituted aryl or substituted heteroaryl, wherein said aryl and heteroaryl groups are independently substituted with one to three substituents selected from the group consisting of halo, hydroxyl, C 1-6 alkyl, C 1-6 haloalkyl, (C 1-6 alkyl)OH, (C 1-6 alkyl)CN and heterocyclyl;

R 2 is hydrogen, C 1-6 alkyl, (C 1-6 alkyl)OH or SO m (C 1-6 alkyl);

R 3 is hydrogen, C 1-6 alkyl or (C 1-3 alkyl)O(C 1-6 alkyl); wherein said alkyl 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, (C 1-6 alkyl)OH, heteroaryl (which is optionally substituted with C(O)NR 4 R 5 ) and heterocyclyl;

or R 2 and R 3 can be taken together with the carbon atoms to which they are attached to form a five or six membered heterocyclic ring, which is optionally substituted with one to two substituents independently selected from the group consisting of C 1-3 alkyl or oxo;

R 4 is hydrogen or C 1-3 alkyl,

R 5 is hydrogen or C 1-3 alkyl,

m is an integer from zero to two;

or a pharmaceutically acceptable salt or stereoisomer thereof.

2. The compound of claim 1 wherein R 1 is substituted aryl, wherein said aryl is substituted with one to three substituents selected from the group consisting of halo and (C 1-6 alkyl)OH, or a pharmaceutically acceptable salt or stereoisomer thereof.

3. The compound of claim 2 wherein R 2 is hydrogen or (C 1-6 alkyl)OH or a pharmaceutically acceptable salt or stereoisomer thereof.

4. The compound of claim 3 wherein W is CR 3 ; R 3 is hydrogen or C 1-6 alkyl, wherein said alkyl group is optionally substituted with one to three substituents independently selected from hydroxyl and heterocyclyl; or a pharmaceutically acceptable salt or stereoisomer thereof.

5. The compound of claim 1 wherein R 1 is substituted heteroaryl, wherein said heteroaryl group is substituted with heterocyclyl; or a pharmaceutically acceptable salt or stereoisomer thereof.

6. The compound of claim 1 wherein m is two; or a pharmaceutically acceptable salt or stereoisomer thereof.

7. The compound of claim 1 selected from:

2-(4-Chlorophenyl)-5-{[5-(1-hydroxy-1-methylethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-(4-Chlorophenyl)-5-{[6-(morpholin-4-ylmethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-(4-Chlorophenyl)-5-{[6-(2-hydroxy-1-morpholin-4-ylethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-(4-Chlorophenyl)-5-{[6-(1,2-dihydroxy-1-methylethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[4-(1-Hydroxy-1-methylethyl)phenyl]-5-{[6-(morpholin-4-ylmethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[4-(1-Hydroxy-1-methylethyl)phenyl]-5-{[6-(2-hydroxy-1-morpholin-4-ylethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

5-({6-[1-(1,1-Dioxidothiomorpholin-4-yl)-2-hydroxyethyl]pyridin-2-yl}amino)-2-[4-(1-hydroxy-1-methylethyl)phenyl]-1,3-thiazole-4-carboxamide;

1-{[6-({4-(Aminocarbonyl)-2-[4-(1-hydroxy-1-methylethyl)phenyl]-1,3-thiazol-5-yl}amino)pyridin-2-yl]methyl}-N-methyl-1H-1,2,3-triazole-4-carboxamide;

5-{[6-(Cyanomethyl)pyridin-2-yl]amino}-2-[4-(1-hydroxy-1-methylethyl)phenyl]-1,3-thiazole-4-carboxamide;

2-[4-(1-Hydroxy-1-methylethyl)phenyl]-5-[(6-methyl-5-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-2-yl)amino]-1,3-thiazole-4-carboxamide;

2-[4-(1-Hydroxy-1-methylethyl)phenyl]-5-{[6-(2,2,2-trifluoro-1-hydroxyethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[4-(1-Hydroxy-1-methylethyl)phenyl]-5-{[5-(1-hydroxy-1-methylethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

5-{[5-(1-Hydroxy-1-methylethyl)-6-methylpyridin-2-yl]amino}-2-[4-(1-hydroxy-1-methylethyl)phenyl]-1,3-thiazole-4-carboxamide;

2-[4-(1-Hydroxy-1-methylethyl)phenyl]-5-{[5-(methylsulfonyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[2,6-Difluoro-4-(1-hydroxy-1-methylethyl)phenyl]-5-{[6-(1-hydroxy-1-methylethyl)pyridazin-3-yl]amino}-1,3-thiazole-4-carboxamide;

2-[2,6-Difluoro-4-(1-hydroxy-1-methylethyl)phenyl]-5-{[5-(1-hydroxy-1-methylethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[2,6-Difluoro-4-(1-hydroxy-1-methylethyl)phenyl]-5-{[5-(methylsulfonyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[2,6-Difluoro-4-(1-hydroxy-1-methylethyl)phenyl]-5-{[5-(1-hydroxy-1-methylethyl)-6-methylpyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[2,6-Difluoro-4-(1-hydroxy-1-methylethyl)phenyl]-5-{[6-(2-hydroxy-1-morpholin-4-ylethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[2,6-Difluoro-4-(1-hydroxy-1-methylethyl)phenyl]-5-({6-[(2-hydroxy-2-methylpropoxy)methyl]pyridin-2-yl}amino)-1,3-thiazole-4-carboxamide;

5-{[6-(2-Hydroxy-1-morpholin-4-ylethyl)pyridin-2-yl]amino}-2-(6-morpholin-4-ylpyridin-3-yl)-1,3-thiazole-4-carboxamide;

5-{[5-(1-Hydroxy-1-methylethyl)pyridin-2-yl]amino}-2-(6-morpholin-4-ylpyridin-3-yl)-1,3-thiazole-4-carboxamide;

5-{[5-(1-Hydroxy-1-methylethyl)-6-methylpyridin-2-yl]amino}-2-(6-morpholin-4-ylpyridin-3-yl)-1,3-thiazole-4-carboxamide;

2-[2-Fluoro-4-(1-hydroxy-1-methylethyl)phenyl]-5-{[6-(2-hydroxy-1-morpholin-4-ylethyl)pyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

2-[2-Fluoro-4-(1-hydroxy-1-methylethyl)phenyl]-5-{[5-(1-hydroxy-1-methylethyl)-6-methylpyridin-2-yl]amino}-1,3-thiazole-4-carboxamide;

or a pharmaceutically acceptable salt or stereoisomer thereof.

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

9. A method of treating polycythemia vera (PV), essential thrombocythemia (ET), myeloid metaplasia with myelofibrosis (MMM), chronic myelogenous leukemia (CML), myelomonocytic leukemia (CMML), hypereosinophilic syndrome (HES), juvenile myelomonocytic leukemia (JMML), or systemic mast cell disease (SMCD) in a mammal in need thereof comprising administering a pharmaceutically acceptable amount of a compound according to claim 1 .