Studies on antispasmodics. I. Synthesis and anticholinergic activity of 1-, 2-, and 3-diarylmethylenequinolizidine quaternary ammonium salts.
作者:EIICHI KOSHINAKA、NOBUO OGAWA、SAKAE KURATA、KAGARI YAMAGISHI、SHINJI KUBO、ISSEI MATSUBARA、HIDEO KATO
DOI:10.1248/cpb.27.1454
日期:——
As part of a search for new antispasmodic agents, we have synthesized 1-, 2-, and 3-diarylmethylenequinolizidine quaternary ammonium salts (4-15), which can be regarded as conformationally rigid derivatives of diphemanil methylsulfate (1) or timepidium bromide (2). The Grignard reaction of ethoxycarbonylquinolizidines (16, 21, and 30) with phenyllithium or 2-thienylmagnesiumbromide, followed by dehydration, afforded diarylmethylenequinolizidines (19, 20, 24, 25, 33, and 34). Quaternization of the 1-substituted derivatives (19 and 20) with methyl bromide afforded only the cis methobromides (4 and 6). On similar treatment, the 2-substituted derivatives (24 and 25) each afforded two isomeric methobromides, the trans (8a and 9a) and cis (8b and 9b), and the 3-substituted derivatives also afforded trans (12a and 13a) and cis methobromides (12b and 13b). The stereochemistry of these methobromides was confirmed by thermal isomerization experiments and the chemical shifts of N+-methyl signals in the 1H-and 13C-nuclear magnetic resonance spectra. The quaternary ammonium salts (4-15) exhibited more potent anticholinergic activity than 1 and 2, and the activities of several compounds (8, 9, and 13) were equal to or greater than that of atropine. The structure-activity relationships of these compounds are discussed.
作为寻找新型解痉药物的一部分,我们合成了1-、2-和3-二芳基亚甲基吡咯并吡啶季铵盐(4-15),它们可以被认为是二苯胺甲基硫酸酯(1)或替匹碘胺溴化物(2)的构象刚性衍生物。将乙氧羰基吡咯并吡啶(16、21和30)与苯基锂或2-噻吩基溴化镁进行格氏反应,随后进行脱水,得到了二芳基亚甲基吡咯并吡啶(19、20、24、25、33和34)。用甲基溴对1-取代衍生物(19和20)进行季铵化,仅得到了顺式甲溴化物(4和6)。类似的处理下,2-取代衍生物(24和25)分别得到了反式(8a和9a)和顺式(8b和9b)两种异构的甲溴化物,3-取代衍生物也得到了反式(12a和13a)和顺式甲溴化物(12b和13b)。这些甲溴化物的立体化学通过热异构化实验和1H及13C核磁共振谱中N+-甲基信号的化学位移得到确认。季铵盐(4-15)表现出比1和2更强的抗胆碱能活性,其中几种化合物(8、9和13)的活性等于或高于阿托品。本文讨论了这些化合物的结构-活性关系。