5-HT3 Receptor antagonists. 2. 4-Hydroxy-4-quinolinecarboxylic acid derivatives
作者:Hiroaki Hayashi、Yoshikazu Miwa、Shunji Ichikawa、Nobuyuki Yoda、Ichiro Miki、Akio Ishii、Motomichi Kono、Tohru Yasuzawa、Fumio Suzuki
DOI:10.1021/jm00057a011
日期:1993.3
Interestingly, the ester derivatives 7c, 7f, and 7h eliminated affinity for the 5-HT3 receptors. These unusual structure-activity relationships and the deviation of the 3-carbonyl moiety from the plane of an aromatic ring suggest that the active conformation of 7a might be different from the proposed one for the preceding 5-HT3 antagonists. Thus, 6f was chosen for further studies. No receptor binding for a variety
设计并合成了一系列4-羟基-3-喹啉羧酸衍生物(6)和4-羟基-2-氧代-1,2-二氢-3-喹啉羧酸衍生物(7),作为5-HT 3受体拮抗剂。分子模型研究表明,6中的3-羰基部分与芳香环的平面几乎共面,但7中的30度偏差。喹啉衍生物中的4-羟基取代增强了对5-HT3受体的亲和力,以及内-N-(8-甲基-8-氮杂双环[3.2.1] oct-3-yl)-4-羟基-3-喹啉甲酰胺(6f )在喹啉衍生物6中的Bezold-Jarisch(BJ)反射测试(ED50 = 0.1微克/千克,iv)中表现出最强的活性。尽管4-羟基-2-氧代-1,2-二氢-3-喹啉甲酰胺衍生物(7a)表现出较高的亲和力(例如7d:Ki = 0。对于5-HT3受体,其活性比恩丹西酮(Ki = 7.6 nM)或格拉司琼(Ki = 2.1 nM)高(48 nM),这些酰胺在BJ反射试验中的活性低于参考化合物。有趣的是,酯衍生物7