Discovery of a C-8 hydroxychromene as a potent degrader of estrogen receptor alpha with improved rat oral exposure over GDC-0927
作者:Sharada S. Labadie、Jun Li、Robert A. Blake、Jae H. Chang、Simon Goodacre、Steven J. Hartman、Weiling Liang、James R. Kiefer、Tracy Kleinheinz、Tommy Lai、Jiangpeng Liao、Daniel F. Ortwine、Vidhi Mody、Nicholas C. Ray、Fabien Roussel、Maia Vinogradova、Siew Kuen Yeap、Birong Zhang、Xiaoping Zheng、Jason R. Zbieg、Jun Liang、Xiaojing Wang
DOI:10.1016/j.bmcl.2019.07.013
日期:2019.8
Phenolic groups are responsible for the high clearance and low oral bioavailability of the estrogen receptor alpha (ER alpha) clinical candidate GDC-0927. An exhaustive search for a backup molecule with improved pharmacokinetic (PK) properties identified several metabolically stable analogs, although in general at the expense of the desired potency and degradation efficiency. C-8 hydroxychromene 30 is the first example of a phenol-containing chromene that not only maintained excellent potency but also exhibited 10-fold higher oral exposure in rats. The improved in vivo clearance in rat was hypothesized to be the result of C-8 hydroxy group being sterically protected from glucuronide conjugation. The excellent potency underscores the possibility of replacing the presumed indispensable phenolic group at C-6 or C-7 of the chromene core. Co-crystal structures were obtained to highlight the change in key interactions and rationalize the retained potency.