Studies on antispasmodics. VI. Synthesis of N-alkyl 6- and 7-diarylmethyleneindolizidinium bromides.
作者:KAGARI YAMAGISHI、EIICHI KOSHINAKA、NOBUO OGAWA、KAZUYA MITANI、TOMOYASU NISHIKAWA、HIDEO KATO、MIYOJI HANAOKA
DOI:10.1248/cpb.28.2783
日期:——
As part of a search for new antispasmodics, we have synthesized N-alkyl 6- and 7-diarylmethyleneindolizidinium bromides (1-8), which might be expected to exhibit potent anticholinergic activities due to the rigid piperidine ring structure, by analogy with N-alkyl 2- and 3-diarylmethylenequinolizidinium bromides (I). Treatment of ethoxycarbonylindolizidines (13 and 22) with phenyllithium or 2-thienylmagnesium bromide, followed by dehydration, afforded diarylmethyleneindolizidines (25, 26, 29 and 30). Quaternization of the 6-substituted derivatives (25 and 26) with methyl bromide afforded two isomeric methobromides, the trans- (1a and 2a) and the cis-methobromides (1b and 2b), and the 7-substituted derivatives (29 and 30) also afforded the corresponding trans- (5a and 6a) and cis-methobromides (5b and 6b). 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 6- and 7-diarylhydroxymethylindolizidines (23, 24, 27 and 28) were also determined from their IR and 13C-NMR spectra.
作为寻找新解痉药的一部分,我们合成了 N-烷基 6- 和 7-二芳基亚甲基吲嗪溴化物 (1-8),通过与 N- 类比,由于其刚性哌啶环结构,预计其可能表现出有效的抗胆碱能活性。烷基2-和3-二芳基亚甲基喹啉鎓溴化物(I)。用苯基锂或2-噻吩基溴化镁处理乙氧基羰基吲哚里西啶(13和22),然后脱水,得到二芳基亚甲基吲哚里西啶(25、26、29和30)。用溴甲烷季铵化 6-取代衍生物(25 和 26),得到两种异构体甲基溴,反式(1a 和 2a)和顺式甲基溴(1b 和 2b),以及 7-取代衍生物(29 和 30)还提供了相应的反式-(5a和6a)和顺式-甲基溴化物(5b和6b)。这些甲基溴化物的立体化学通过 1H- 和 13C-NMR 谱中 N+-甲基信号的化学位移得到证实。 6-和7-二芳基羟甲基吲哚里西啶(23、24、27 和28)的立体化学也由它们的IR 和13C-NMR 光谱确定。