Selective Syntheses of Δ<sup>α,β</sup> and Δ<sup>β,γ</sup> Butenolides from Allylic Cyclopropenecarboxylates via Tandem Ring Expansion/[3,3]-Sigmatropic Rearrangements
作者:Xiaocong Xie、Yi Li、Joseph M. Fox
DOI:10.1021/ol400264a
日期:2013.4.5
Allylic cyclopropenecarboxylates undergo ring expansion reactions to give 2-allyloxyfuran intermediates, which subsequently rearrange to Delta(beta,gamma) butenolides via a Cialsen rearrangement or to the corresponding Delta(alpha,beta) butenolides via further Cope rearrangement. Also described are methods for chirality transfer in the rearrangement of nonracemic allylic esters.