The present invention is directed to compounds of formula I-V and tautomers thereof or pharmaceutically acceptable salts, esters, and prodrugs thereof which are inhibitors of 
syk kinase. The present invention is also directed to intermediates used in making such compounds, the preparation of such a compound, pharmaceutical compositions containing such a compound, methods of inhibition 
syk kinase activity, methods ofinhibilion the 
platelet aggregation, and methods to prevent or treat a number of conditions mediated at least in part by 
syk kinase activity, such as cardiovascular 
disease, inflammatory 
disease and 
autoimmune disease and 
cell proliferative disorder. Formula (I) Y1 is selected from the group consisting of: (a) and (b); Z is O or S; D1 is selected from the group consisting of: (a) phenyl substituted with a group, R5 (b) naphthyl (c) C3-8cycloalkyl (d) heteroaryl (e) heterocyclyl.