Selective CB2 agonists with anti-pruritic activity: Discovery of potent and orally available bicyclic 2-pyridones
作者:Ken-ichi Kusakabe、Yasuyoshi Iso、Yukio Tada、Masahiro Sakagami、Yasuhide Morioka、Nobuo Chomei、Satomi Shinonome、Keiko Kawamoto、Hideyuki Takenaka、Kiyoshi Yasui、Hiroshi Hamana、Kohji Hanasaki
DOI:10.1016/j.bmc.2013.03.030
日期:2013.6
The CB2 receptor has emerged as a potential target for the treatment of pruritus as well as pain without CB1-mediated side effects. We previously identified 2-pyridone derivatives 1 and 2 as potent CB2 agonists; however, this series of compounds was found to have unacceptable pharmacokinetic profiles with no significant effect in vivo. To improve these profiles, we performed further structural optimization of 1 and 2, which led to the discovery of bicyclic 2-pyridone 18e with improved CB2 affinity and selectivity over CB1. In a mouse pruritus model, 18e inhibited compound 48/80 induced scratching behavior at a dose of 100 mg/kg. In addition, the docking model of 18e with an active-state CB2 homology model indicated the structural basis of its high affinity and selectivity over CB1. (C) 2013 Published by Elsevier Ltd.