Discovery of novel CDK inhibitors via scaffold hopping from CAN508
Liandong Jing1, Yanbo Tang1, Zhiyan Xiao1
1Beijing Key Laboratory of Active Substance Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
Abstract:
Cyclin-dependent kinases (CDKs) are promising drug targets for various human diseases, especially for cancers. Scaffold hopping strategy was applied on CAN508, a known selective CDK9 inhibitor, and a series of pyrazolo[3,4-b]pyridine compounds were synthesized and evaluated in vitro as CDK2 and CDK9 inhibitors. Most compounds exhibited moderate to potent inhibitory activities against both CDK2/cyclin A and CDK9/cyclin T1 systems. Among them, compound 2e showed IC50 values of 0.36 μM for CDK2 and 1.8 μM for CDK9, respectively. Notably, the scaffold alteration seems to cause a shift in the selectivity profile of the inhibitors. In contrast to CAN508, compound 2k demonstrated remarkable selectivity toward CDK2 (265-fold over CDK9). Docking studies on compound 2k provided hints for further design of more potent and selective CDK2/CDK9 inhibitors.
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