Versatile templates for the development of novel kinase inhibitors: Discovery of novel CDK inhibitors

A series of four bicyclic cores were prepared and evaluated as cyclin-dependent kinase-2 (CDK2) inhibitors. From the invitro and cell-based analysis, the pyrazolo[1,5-a]pyrimidine core (represented by 9) emerged as the superior core for further elaboration in the identification of novel CDK2 inhibitors. (C) 2007 Elsevier Ltd. All rights reserved.