Modified aza-claisen rearrangement: Generation and isomerization of allyl enammonium salts
作者:John C Gilbert、K.P.A Senaratne
DOI:10.1016/s0040-4039(01)80240-9
日期:1984.1
Base-promoted reaction of ketones and diethyl (diazomethyl)phosphonate in the presence of allylic amines affords allylic enamines in good yields. These enamines undergo [3,3]-sigmatropic rearrangement upon alkylation and heating at 80°C to iminium salts which can be hydrolysed to aldehydes. The procedure allows generation of quaternary carbon centers under mild reaction conditions.
在烯丙基胺的存在下,酮与(重氮甲基)膦酸二乙酯进行碱促进的反应可得到高收率的烯丙基烯胺。这些烯胺在烷基化并在80°C加热至亚胺盐后会发生[3,3]-σ重排,该亚胺盐可水解为醛。该程序允许在温和的反应条件下生成季碳中心。