Syn-diastereoselective alkenylation with a modified Seyferth–Wittig reagent: modification of the silyl substituents and isopropenylation
作者:Masamitsu Tsukamoto、Hideo Lio、Takashi Tokoroyama
DOI:10.1039/c39860000880
日期:——
The introduction of electronegative substituents onto the silyl group of triaryl(2-silylethylidene)phosphorane promotes eliminative silyl migration relative to the Wittig reaction; the combination of this effect with modification of the phosphorane substituents leads to highly diastereoselective reagents for alkenylation.
相对于Wittig反应,在三芳基(2-甲硅烷基亚乙基)膦烷的甲硅烷基上引入负电取代基可促进消除甲硅烷基的迁移。这种作用与磷烷取代基修饰的结合产生了高度非对映选择性的烯基化试剂。