Dichotomous Reactivity in the Reaction of Triethyl- and Triphenylphosphane HBr Salts with Dimethyl Acetals: A Novel Entry to α-Alkoxy-Functionalized Ylides and General Synthesis of Vinyl Ethers and Alkoxy Dienes
作者:Priyabrata Das、James McNulty
DOI:10.1002/ejoc.201000601
日期:2010.7
discovery of dichotomousreactivity in the reaction of trialkyl- vs. triphenylphosphaneHBrsalts with acetals allows entry to functionalized α-methoxy phosphonium salts and a novel process for tertiary phosphane methylation. The new protocol opens a generalentry to the synthesis of vinylethers and differentially substituted 1,3-dienes via Wittig reactions of the functionalized ylides derived from