Benzoxazines. II. Synthesis, Conformational Analysis, and Structure-Activity Relationships of 3,4-Dihydro-2H-1,4-benzoxazine-8-carboxamide Derivatives as Potent and Long-Acting Serotonin-3 (5-HT3) Receptor Antagonists.
作者:Takanobu KUROITA、Nobuhiro MARUBAYASHI、Mitsuharu SANO、Kouji KANZAKI、Kenichi INABA、Takeshi KAWAKITA
DOI:10.1248/cpb.44.2051
日期:——
of 3,4-dihydro-2H-1,4-benzoxazine-8-carboxamide derivatives was synthesized and evaluated for serotonin-3 (5HT3) receptor antagonistic activities by means of assays of 5-HT3 receptor binding and the ability to antagonize the von Bezold-Jarisch reflex in rats. Replacement of the 1,4-benzoxazine ring with a 1,4-benzthiepine ring or seven-membered ring (i.e., 1,5-benzoxepine or 1,5-benzthiepine) resulted
合成了一系列3,4-二氢-2H-1,4-苯并恶嗪-8-羧酰胺衍生物,并通过测定5-HT3受体结合和拮抗能力评估了血清素3(5HT3)受体拮抗活性。 von Bezold-Jarisch反射在大鼠中。用1,4-苯并ie庚因环或七元环(即1,5-苯并x庚因或1,5-苯并th庚因)取代1,4-苯并嗪环导致对5-HT 3受体的亲和力降低。在1,4-苯并恶嗪环的2位上引入取代基提高了拮抗活性(二甲基>甲基>二氢>苯基)。带有9-甲基-9-氮杂双环[3.3.1]非-3-基部分作为3,4-二氢-2H-1,4-苯并恶嗪-8-羧酰胺衍生物基本部分的化合物与带有1-氮杂双环[2.2.2]辛-3-基部分。根据NMR研究和X射线分析,证实9-甲基-9-氮杂双环[3.3.1]非-3-基部分采用了船椅构象。在这个系列中,内基6-氯-3,4-二氢-N-(9-甲基-9-氮杂双环[3.3.1] non-3-yl)-2,2,4-三甲基-2H-1,