Ring expansion of aziridines to piperidines using the aza-wittig rearrangement
作者:Iain Coldham、Alan J Collis、Roger J Mould、Richard E Rathmell
DOI:10.1016/0040-4039(95)00557-s
日期:1995.5
of unsaturated piperidines from 2-keto aziridines is reported, Treatment of a range of 2-keto aziridines with two equivalents of a phosphonium ylide generates intermediate vinyl aziridines which rearrange by a [2,3]-sigmatropic shift to create a new carbon-carbon bond with concomitant ring opening of the aziridines to give the unsaturated piperidines. This three- to six-membered ring expansion allows