Q1 · MEDICINE
Article
Author: Macarron, Ricardo ; Epling, Leslie B. ; Ye, Min ; Kapilashrami, Kanishk ; Wang, Xiaozhao ; Xu, Meizhong ; Xiao, Kai-Jiong ; Hummel, Joshua R. ; Kim, Sunkyu ; Wee, Susan ; Diamond, Sharon ; Yao, Wenqing ; Yang, Jeffrey C. ; Wu, Liangxing ; Drake, Katherine ; Huo, Lu ; Lo, Yvonne ; Stump, Kristine ; Yeleswaram, Swamy ; Mukai, Ken ; Deller, Marc C. ; Qian, Dingquan ; Covington, Maryanne ; Ye, Qinda ; Roman, Valerie ; Weber, Michael ; Zhang, Guofeng
CDK2 is a critical regulator of the cell cycle. For a variety of human cancers, the dysregulation of CDK2/cyclin E1 can lead to tumor growth and proliferation. Historically, early efforts to develop CDK2 inhibitors with clinical applications proved unsuccessful due to challenges in achieving selectivity over off-target CDK isoforms with associated toxicity. In this report, we describe the discovery of (4-pyrazolyl)-2-aminopyrimidines as a potent class of CDK2 inhibitors that display selectivity over CDKs 1, 4, 6, 7, and 9. SAR studies led to the identification of compound 17, a kinase selective and highly potent CDK2 inhibitor (IC50 = 0.29 nM). The evaluation of 17 in CCNE1-amplified mouse models shows the pharmacodynamic inhibition of CDK2, measured by reduced Rb phosphorylation, and antitumor activity.