Rearrangement of α,δ-dichloroaldimines to 2-formylpyrrolidines: α,α-Azacyclobisalkylation of aldehydes
作者:Norbert De Kimpe、Christian Stevens、Miklos Virag
DOI:10.1016/0040-4020(95)01112-9
日期:1996.2
Treatment of α,δ-dichloroaldimines, prepared via α-chlorination with N-chlorosuccinimide of the corresponding δ-chloroaldimines, with potassium carbonate in methanol led to the formation of 1-alkyl-2-(dimethoxymethyl)pyrrolidines in good yields. The reaction mechanism involved a skeletal rearrangement of the α,δ-dichloroaldimines to give bicyclic aziridinium intermediates which suffered ring opening
通过用碳酸钾在甲醇中的N-氯代琥珀酰亚胺的N-氯代琥珀酰亚胺的α-氯化处理,通过α-氯化制备α,δ-二氯醛亚胺,以高收率形成1-烷基-2-(二甲氧基甲基)吡咯烷。反应机理涉及α,δ-二氯亚胺的骨架重排,得到双环叠氮鎓中间体,其中间体开环形成1-烷基-2-(二甲氧基甲基)吡咯烷。后者在酸性介质中水解,得到新的1-烷基-2-甲酰基吡咯烷。整个途径涉及醛的α,α-氮杂双环烷基化。