In a search for new antispasmodics, we have synthesized N-alkyl 2- and 1-diarylmethyleneindolizidinium bromides (6-13), which can be regarded as conformationally rigid derivatives of prifinium bromide (14) or the basic compound (15) of the pyrrolidine antispasmodics. Condensation of ethoxycarbonylindolizidines (20 and 26) with phenyllithium or 2-thienylmagnesium bromide, followed by dehydration, afforded diarylmethyleneindolizidines (23, 24, 29 and 30). Quaternization of the 2-substituted derivatives (23 and 24) with methyl bromide afforded two isomeric methobromides, the trans-(6a and 7a) and the cis-methobromides (6b and 7b), while the 1-substituted derivatives (29 and 30) afforded only the cis-methobromides (10 and 11). The stereochemistries of these methobromides were confirmed by the chemical shifts of the N+-methyl signals in the 1H- and 13C-NMR spectra. The stereochemistries of 2- and 1-diarylhydroxymethylindolizidines (21, 22, 27 and 28) were also determined from the IR spectra and by X-ray analysis. The quaternary ammonium salts (6-13) exhibited anticholinergic activity more potent than that of 15, and the activities of several compounds were equal to that of 14. The structure-activity relationships of these compounds are discussed.
为了寻找新的解痉剂,我们合成了 N-烷基 2-和 1-二芳基亚甲基
吲哚嗪
溴化物(6-13),它们可被视为普利
菲溴化物(14)或
吡咯烷解痉剂基本化合物(15)的构象刚性衍
生物。乙氧羰基
吲哚利嗪(20 和 26)与
苯基锂或 2-
噻吩基
溴化镁缩合,然后脱
水,得到二芳基亚甲基
吲哚利嗪(23、24、29 和 30)。用
溴甲烷对 2-取代衍
生物(23 和 24)进行季
铵化反应,可得到两种异构体
溴甲烷,即反式
溴甲烷(6a 和 7a)和顺式
溴甲烷(6b 和 7b),而 1-取代衍
生物(29 和 30)只能得到顺式
溴甲烷(10 和 11)。1H 和 13C-NMR 光谱中 N+-甲基信号的
化学位移证实了这些
溴化
甲烷的立体
化学性质。通过红外光谱和 X 射线分析,还确定了 2-和 1-二芳基羟甲基
吲哚嗪(21、22、27 和 28)的立体
化学性质。季
铵盐(6-13)表现出比 15 更强的抗
胆碱能活性,其中几个化合物的活性与 14 相当。本文讨论了这些化合物的结构-活性关系。