Synthesis and Structure-Activity Relationship of 3-Substituted Benzamide, Benzo(b)furan-7-carboxamide, 2,3-Dihydrobenzo(b)furan-7-carboxamide, and Indole-5-carboxamide Derivatives as Selective Serotonin 5-HT4 Receptor Agonits.
作者:Takuji KAKIGAMI、Toshinao USUI、Katsura TSUKAMOTO、Tadashi KATAOKA
DOI:10.1248/cpb.46.42
日期:——
The title compounds (6-9) were prepared and evaluated for serotonin 5-HT4 agonistic activity in in vitro tests. Introducing a propyl or allyl group at the 3-position of benzamide caused only a slight enhancement of agonistic activity. Construction of the benzo[b]furan skeleton and 2, 3-dihydrobenzo[b]furan skeleton caused a significant enhancement of the activity. 4-Amino-N-[2-(1-azabicyclo[3.3.0]octan-5-yl)ethyl]-5-chloro-2-methylbenzo[b]furan-7-carboxamide (7b) hemifumarate was as potent as cisapride. 4-Amino-N-[2-(1-azabicyclo[3.3.0]octan-5-yl)ethyl]-5-chloro-2, 3-dihydro-2-methylbenzo[b]furan-7-carboxamide (8a) hemifumarate, 4-amino-N-[2-(1-azabicyclo-[3.3.0]octan-5-yl)ethyl]-5-chloro-2, 3-dihydro-2-ethylbenzo[b]furan-7-carboxamide (8c) hemifumarate, and 4-amino-N-[2-(1-azabicyclo[3.3.0]octan-5-yl)ethyl]-5-chloro-2, 3-dihydro-2, 3-dimethylbenzo[b]furan-7-carboxamide (8d) hemifumarate were potent than cisapride. Furthermore, 8a hemifumarate was free from dopamine D1, D2, serotonin 5-HT1, 5-HT2 and muscarine M1, M2 receptor binding activity in the in vitro tests. On the other hand, construction of the indole skeleton caused a remarkable decrease in activity.
标题化合物(6-9)已被合成并在体外测试中评估其对血清素5-HT4的激动活性。在苯酰胺的3位引入丙基或烯丙基仅导致激动活性的轻微增强。而构建苯并[b]呱骨架和2,3-二氢苯并[b]呱骨架则显著增强了活性。4-氨基-N-[2-(1-叠氮环[3.3.0]八烷-5-基)乙基]-5-氯-2-甲基苯并[b]呱-7-羧酰胺(7b)半富马酸盐的效力与西沙必利相当。4-氨基-N-[2-(1-叠氮环[3.3.0]八烷-5-基)乙基]-5-氯-2,3-二氢-2-甲基苯并[b]呱-7-羧酰胺(8a)半富马酸盐,4-氨基-N-[2-(1-叠氮环[3.3.0]八烷-5-基)乙基]-5-氯-2,3-二氢-2-乙基苯并[b]呱-7-羧酰胺(8c)半富马酸盐,以及4-氨基-N-[2-(1-叠氮环[3.3.0]八烷-5-基)乙基]-5-氯-2,3-二氢-2,3-二甲基苯并[b]呱-7-羧酰胺(8d)半富马酸盐的效力均优于西沙必利。此外,8a半富马酸盐在体外测试中未表现出对多巴胺D1、D2、血清素5-HT1、5-HT2及毒蕈碱M1、M2受体的结合活性。另一方面,构建吲哚骨架则导致活性显著降低。