A One-Pot, Base-Free Annelation Approach to α-Alkylidene-γ-butyrolactones
作者:Russell R. A. Kitson、Richard J. K. Taylor、John L. Wood
DOI:10.1021/ol902191d
日期:2009.11.19
A novel annelation procedure has been developed for the conversion of γ-hydoxy enones into α-alkylidene-γ-butyrolactones. This one-pot method utilizes the Bestmann ylide (triphenylphosphoranylideneketene) and proceeds by way of acylation followed by an intramolecular conjugate addition/proton transfer/Wittig olefination sequence. The procedure is “base-free” and is useful for the preparation of a range