Synthesis and Some Reactions of Ethyl 2-[2-(Substituted Methyleneamino)anilino]cyclohepta[<i>b</i>]pyrrole-3-carboxylates
作者:Noritaka Abe、Akikazu Kakehi
DOI:10.1246/bcsj.65.1538
日期:1992.6
e (1) in excellent yields by treating 1 with benzaldehyde or 2-butenal in the presence of molecular sieves 4A, respectively. Further, the cyclization and cycloaddition reactions of the Schiff bases were investigated. Treatment of 2a with iron(III) chloride or Pd–C gave ethyl 2-(2-phenylbenzimidazol-1-yl)cyclohepta[b]pyrrole-3-carboxylate and 12H-5,13-dihydrocyclohepta[1′,2′ : 4,5]pyrrolo[2,3-b][1,
我们合成了席夫碱、乙基 2-[2-(benzilideneamino)anilino]cyclohepta[b]pyrrole-3-carboxylate (2a) 和乙基 2-[2-(2-butenylideneamino)anilino]cyclohepta[b]pyrrole-3-通过分别在分子筛 4A 存在下用苯甲醛或 2-丁烯醛处理 1,由 2-(2-氨基苯胺基) 环庚 [b] 吡咯-3-羧酸乙酯 (1) 制备羧酸酯 (2b),收率极好。此外,研究了席夫碱的环化和环加成反应。用氯化铁 (III) 或 Pd-C 处理 2a 得到 2-(2-苯基苯并咪唑-1-基) 环庚 [b] 吡咯-3-羧酸乙酯和 12H-5,13-二氢环庚 [1',2' : 4,5]pyrrolo[2,3-b][1,5]benzodiazepin-12-one (4)。然而,对 2b 进行类似处理,得到 2-(4