Design, synthesis, and pharmacological evaluation of N-bicyclo-5-chloro-1H-indole-2-carboxamide derivatives as potent glycogen phosphorylase inhibitors
作者:Kenichi Onda、Ryota Shiraki、Takashi Ogiyama、Kazuhiro Yokoyama、Kazuhiro Momose、Naoko Katayama、Masaya Orita、Tomohiko Yamaguchi、Masako Furutani、Noritaka Hamada、Makoto Takeuchi、Minoru Okada、Mitsuaki Ohta、Shin-ichi Tsukamoto
DOI:10.1016/j.bmc.2008.10.021
日期:2008.12
As a result of the various N-bicyclo-5-chloro-1H-indole-2-carboxamide derivatives with a hydroxy moiety synthesized in an effort to discover novel glycogen phosphorylase (GP) inhibitors, 5-chloro-N-(5-hydroxy-5,6,7,8-tetrahydronaphthalen-2-yl)-1H-indole-2-carboxamide (5b) was found to have potent inhibitory activity. The introduction of fluorine atoms both at a position adjacent to the hydroxy group and in the central benzene moiety lead to the optically active derivative 5-chloro-N-[(5R)-1,3,6,6-tetrafluoro-5-hydroxy-5,6,7,8-tetrahydronaphthalen-2-yl]-1H-indole-2-carboxamide(25e alpha, which was the most potent compound in this series (IC(50) = 0.020 mu M). This compound inhibited glucagon-induced glucose output in cultured primary hepatocytes with an IC(50) value of 0.69 mu M, and showed oral hypoglycemic activity in diabetic db/db mice at 10 mg/kg. Compound 25e alpha also had an excellent pharmacokinetic profile, with high oral bioavailability and a long plasma half-life, in male SD rats. The binding mode of 25e alpha to this molecule and the role of fluorine atoms in that binding were speculated in an enzyme docking study. (c) 2008 Elsevier Ltd. All rights reserved.