Quality by design (QbD) of amide isosteres: 5,5-Disubstituted isoxazolines as potent CRTh2 antagonists with favorable pharmacokinetic and drug-like properties
作者:Dong Xiao、Xiaohong Zhu、Younong Yu、Ning Shao、Jie Wu、Kevin D. McCormick、Pawan Dhondi、Jun Qin、Robert Mazzola、Haiqun Tang、Ashwin Rao、Phieng Siliphaivanh、Hongchen Qiu、Xiaoxin Yang、Maria Rivelli、Charles G. Garlisi、Steve Eckel、Gitali Mukhopadhyay、Craig Correll、Diane Rindgen、Robert Aslanian、Anandan Palani
DOI:10.1016/j.bmcl.2014.01.043
日期:2014.3
Isoxazoles are frequently used amide isosteres, as shown in the context of discovery of CRTh2 antagonists from amide 1 to isoxazole 2. However, persistent agonism and poor solubility in isoxazole series presented challenges to its further development. Based on the concept of quality by design (QbD), 5,5-disubstituted isoxazolines 3 were introduced. The chirality at 5 position of isoxazolines controlled the switch between two modes of actions, which led to a novel series of pure antagonists. This non-planar motif also conferred a change of shape of these molecules, which avoided flat structures and improved their physical properties. (C) 2014 Elsevier Ltd. All rights reserved.