Syntheses and analgesic activities of 1-(2-methyl-2-(N-propionyl-p- or m-substituted-phenylamino)ethyl)-4-phenethylpiperazines.
作者:JUTARO OKADA、KOICHI NAKANO、MASAHARU SHIMABAYASHI、TORU MAEJIMA
DOI:10.1248/cpb.32.986
日期:——
For the purpose of increasing the analgesic activity of N-[1-methyl-2-(4-phenethyl-piperazino) ethyl] propionanilide (I), several substituent groups were introduced into both benzene rings of I. 1-[2-Methyl-2-(N-propionyl-p-or m-substituted-phenylamino) ethyl]-4-phenethylpiperazines (VIa-f, h) and 1-[2-methyl-2-(N-propionyl-p-methoxyphenylamino) ethyl]-4-(p-substituted-phenethyl) piperazines (XIIa-e) were prepared by substitution at the p-or m-position of the aniline moiety, and by substitution at the p-position of the phenethyl moiety, respectively. Potent activity (92-100% inhibition of writhing at 30mg/kg, s.c.) could be achieved by introducing alkoxyl groups into the benzene ring of the aniline moiety. Among such compounds, 1-[2-methyl-2-(N-propionyl-p-methoxyphenylamino) ethyl]-4-phenethylpiperazine (VIa) showed the highest activity (ED50 : 1.64mg/kg, s.c.). On the other hand, introduction of several substituents into the benzene ring of the phenethyl moiety resulted in low analgesic activities (2-58% inhibition of writhing at 30mg/kg, s.c.).
为了提高 N-[1-甲基-2-(4-苯乙基哌嗪基)乙基]丙酰苯胺(I)的镇痛活性,在 I 的两个苯环上引入了几个取代基团。1-[2-甲基-2-(N-丙酰基-或 m-取代苯基氨基)乙基]-4-苯乙基哌嗪(VIa-f、h)和 1-[2-甲基-2-(N-丙酰基-对甲氧基苯基氨基)乙基]-4-(对取代苯乙基)哌嗪(XIIa-e)分别通过苯胺分子的 p 位或 m 位取代和苯乙基分子的 p 位取代制备而成。通过在苯胺基团的苯环上引入烷氧基,可以获得强效活性(在 30 毫克/千克的剂量下,静脉注射对蠕动的抑制率为 92%-100%)。在这些化合物中,1-[2-甲基-2-(N-丙酰基-对甲氧基苯基氨基)乙基]-4-苯乙基哌嗪(VIa)的活性最高(ED50:1.64 毫克/千克,口服)。另一方面,在苯乙基的苯环上引入几个取代基后,镇痛活性较低(30 毫克/千克,口服,对蠕动的抑制率为 2-58%)。