New 5-HT3(Serotonin-3) Receptor Antagonists. I. Synthesis and Structure-Activity Relationships of Pyrido(1,2-a)indoles.
作者:Masayuki KATO、Kiyotaka ITO、Shigetaka NISHINO、Hisashi YAMAKUNI、Hisashi TAKASUGI
DOI:10.1248/cpb.42.2546
日期:——
A series of pyrido[1,2-alpha]indol-6(7-H)-ones was prepared and evaluated for 5-HT3 receptor antagonist activity. The structural requirements for the 5-HT3 receptor antagonist have been defined as an aromatic moiety, a basic nitrogen, and a linking acyl group. The (5-methylimidazol-4-yl)methyl group as a basic nitrogen moiety was an important element for high potency. The highest potency was observed
制备了一系列的吡啶并1,2-α吲哚-6(7-H)-酮,并评估了5-HT 3受体拮抗剂的活性。5-HT 3受体拮抗剂的结构要求定义为芳族部分,碱性氮和连接酰基。作为碱性氮部分的(5-甲基咪唑-4-基)甲基是高效力的重要元素。对于在吡啶并[1,2-α-吲哚-6(7H)-环上具有7-和10-甲基取代基的化合物,观察到最高的效力。从该系列中,选择(+)-11b(FK 1052)进行进一步评估。FK 1052在大鼠的Bezold-Jarisch反射试验中是有效的5-HT3受体拮抗剂(ED50 0.9微克/千克,静脉注射),并且是一种非常有效的止吐剂,可抵抗狗的顺铂引起的呕吐(ED50 1.2 x 2微克/千克, iv和2.7 x 2毫克/千克,口服)。