Studies of CDK 8/19 inhibitors: Discovery of novel and selective CDK8/19 dual inhibitors and elimination of their CYP3A4 time-dependent inhibition potential
作者:Jun Fujimoto、Takaharu Hirayama、Yasuhiro Hirata、Yukiko Hikichi、Saomi Murai、Maki Hasegawa、Yuka Hasegawa、Kazuko Yonemori、Akito Hata、Kazunobu Aoyama、Douglas R. Cary
DOI:10.1016/j.bmc.2017.03.049
日期:2017.6
In this article, synthetic studies around a pyridylacrylamide-based hit compound (1), utilizing structure based drug design guided by CDK8 docking models, is discussed. Modification of the pendant 4-fluorophenyl group to various heteroaromatic rings was conducted aiming an interaction with the proximal amino acids, and then replacement of the morpholine ring was targeted for decreasing potential of time dependent CYP3A4 inhibition. These efforts led to the compound 4k, with enhanced CDK8 inhibitory activity and no apparent potential for time-dependent CYP3A4 inhibition (CDK8 IC50: 2.5 nM; CYP3A4 TDI: 99% compound remaining). Compound 4k was found to possess a highly selective kinase inhibition profile, and also showed favorable pharmacokinetic profile. Oral administration of 4k (15 mg/kg, bid. for 2 weeks) suppressed tumor growth (TIC 29%) in an RPM18226 mouse xenograft model. (C) 2017 Elsevier Ltd. All rights reserved.