Melanin-Concentrating Hormone Receptor 1 Antagonists. Synthesis and Structure–Activity Relationships of Novel 3-(Aminomethyl)quinolines
作者:Makoto Kamata、Toshiro Yamashita、Toshihiro Imaeda、Toshio Tanaka、Shinichi Masada、Masahiro Kamaura、Shizuo Kasai、Ryoma Hara、Shigekazu Sasaki、Shiro Takekawa、Asano Asami、Tomoko Kaisho、Nobuhiro Suzuki、Shuntaro Ashina、Hitomi Ogino、Yoshihide Nakano、Yasutaka Nagisa、Koki Kato、Kaneyoshi Kato、Yuji Ishihara
DOI:10.1021/jm201596h
日期:2012.3.8
It was found that 3-(aminomethyl)quinoline derivatives showed high binding affinities for melanin-concentrating hormone receptor 1 (MCHR1) with reduced affinity for serotonin receptor 2c (5-HT2c) when the dihydronaphthalene nucleus of compound 1 (human MCHR1, IC50 = 1.9 nM; human 5-HT2c receptor, IC50 = 0.53 nM) was replaced by other bicyclic core scaffolds. Among the synthesized compounds, 8-methylquinoline derivative 5v especially showed high binding affinity (IC50 = 0.54 nM), potent in vitro antagonistic activity (IC50 = 2.8 nM) for MCHR1, and negligible affinity for 5-HT2c receptor (IC50 > 1000 nM). Oral administration of 5v significantly and dose-dependently suppressed nocturnal food intake in diet-induced obese rats and did not affect food intake in MCHR1-deficient mice. These results and rat pharmacokinetic study findings suggested that compound 5v is a highly potent, orally bioavailable, and centrally acting nonpeptide MCHR1 antagonist.