Formation of α-iminoketones and α-diimines versus Favorskii rearrangement products from the reaction of α,α′-dibromoketones and primary amines
作者:Norbert De Kimpe、Luc D'Hondt、Luc Mones
DOI:10.1016/s0040-4020(01)92258-6
日期:1992.4
reaction of aliphatic acyclic α,α′-dibromoketones with primary amines gave rise to α-iminoketones and α-diimines. Both reaction products could be selectively obtained under appropriate reaction conditions. Sterically hindered α,α-dibromoketones did not react with primary amines, although, under forcing conditions the Favorskii rearrangement could be induced. In aqueous methanol, α,α′-dibromoketones reacted
脂族无环α,α′-二溴酮与伯胺的反应产生α-亚氨基酮和α-二亚胺。两种反应产物都可以在适当的反应条件下选择性地获得。受位阻的α,α-二溴酮不与伯胺反应,尽管在强迫条件下可以诱导Favorskii重排。在甲醇水溶液中,α,α'-二溴代酮与伯胺反应生成Favorskii重排,而不是α-亚氨基酮的形成。脂环族α,α'-二溴代酮对伯胺的行为不同,因为五元环提供2-(N-烷基)氨基-2-环戊烯酮,而六元环引起Favosskii环收缩。