New 5-HT3 (Serotonin-3) Receptor Antagonists. V. Synthesis and Structure-Activity Relationships of Pyrrolo(2,1-c) (1,4)benzoxazine-6-carboxamides.
作者:Masayuki KATO、Shigetaka NISHINO、Kiyotaka ITO、Hisashi YAMAKUNI、Hisashi TAKASUGI
DOI:10.1248/cpb.43.1358
日期:——
structurally novel heterocyclic carboxamides which are highly potent 5-HT3 (serotonin-3) receptor antagonists. Pyrrolo[2,1-c][1,4]benzoxazine-6-carboxamides (12 and 20) were found to possess potent 5-HT3 receptor antagonist activity on the von Bezold-Jarisch reflex in anesthetized rats. Structure-activity studies showed that compounds with small and lipophilic substituents such as chloro and methyl at
本文介绍了结构新颖的杂环羧酰胺的发现,该酰胺是高效的5-HT3(5-羟色胺3)受体拮抗剂。发现吡咯并[2,1-c] [1,4]苯并恶嗪-6-羧酰胺(12和20)对麻醉大鼠的von Bezold-Jarisch反射具有有效的5-HT3受体拮抗剂活性。结构活性研究表明,在芳族环部分的8位上具有小的亲脂性取代基(如氯和甲基)的化合物保留了较高的效价,而具有庞大的取代基的化合物则基本无活性。在4-位的二甲基基团稍微降低了效力。1-氮杂双环[2.2.2]辛-3-胺作为胺部分提供了最有效的活性。在这个系列中,发现20a是最有效的5-HT3受体拮抗剂,