N-(1-Methyl-2-piperazinoethyl) anilines (5a-e) and 2-alkoxy-6-[1-methyl-2-(4-phenethylpiperazino) ethyl]-amino-benzothiazoles (8a-d) were prepared by the reduction of 1-(2-anilinopropionyl) piperazines (4a-e) and 1-[2-(2-alkoxy-benzothiazolyl-(6))-aminopropionyl]-4-phenethylpiperazines (7a-d). N-(1-Methyl-2-piperazinoethyl) propionanilides (6a-e) and 2-alkoxy-6-[N-[1-methyl-2-(4-phenethylpiperazino) ethyl] propionamide]-benzothiazoles (9a-d) were prepared by N-propionylation of 5a-e and 8a-d. Analgesic activity testing showed that (A) N-[1-methyl-2-(4-benzylpiperazino) ethyl]-propionanilide (6d) and N-[1-methyl-2-(4-phenethylpiperazino) ethyl] propionanilide (6e) possessed ca. 1/3 of the analgesic effect of pentazocine ; (B) N-propionylation of N-[1-methyl-2-(4-benzylpiperazino) ethyl] aniline (5d) and N-[1-methyl-2-(4-phenethylpiperazino) ethyl]-aniline (5e) increased the analgesic activity, but N-propionylation of 8a-d decreased the analgesic activity ; (C) an aniline derivative (6e) was more potent than the 2-alkoxy-6-aminobenzothiazole derivatives (9a-d).
N-(1-甲基-2-
哌嗪乙基)
苯胺(5a-e)和2-烷氧基-6-[1-甲基-2-(4-苯乙基
哌嗪)乙基]-
氨基
苯并噻唑(8a-d)是通过将1-(2-
苯胺丙酰)
哌嗪(4a-e)和1-[2-(2-烷氧基
苯并噻唑-(6))-
氨基丙酰] -4-苯乙基
哌嗪(7a-d)还原制备的。N-(1-甲基-2-
哌嗪乙基)丙酰
苯胺(6a-e)和2-烷氧基-6-[N-[1-甲基-2-(4-苯乙基
哌嗪)乙基]丙酰酰胺]-
苯并噻唑(9a-d)是通过将5a-e和8a-d进行N-丙酰化制备的。镇痛活性测试表明:(A)N-[1-甲基-2-(4-苯基
哌嗪)乙基]丙酰
苯胺(6d)和N-[1-甲基-2-(4-苯乙基
哌嗪)乙基]丙酰
苯胺(6e)的镇痛效果约为噻
吩噻嗪的1/3;(B)对N-[1-甲基-2-(4-苯基
哌嗪)乙基]
苯胺(5d)和N-[1-甲基-2-(4-苯乙基
哌嗪)乙基]
苯胺(5e)进行N-丙酰化可增强镇痛活性,但对8a-d的N-丙酰化则降低了镇痛活性;(C)一种
苯胺衍
生物(6e)的效力高于2-烷氧基-
6-氨基苯并噻唑衍
生物(9a-d)。