Opening of Tartrate Acetals Using Dialkylboron Bromide: Evidence for Stereoselectivity Downstream from Ring Fission
作者:Yvan Guindon、William W. Ogilvie、Josée Bordeleau、Wei Li Cui、Kathy Durkin、Vida Gorys、Hélène Juteau、René Lemieux、Dennis Liotta、Bruno Simoneau、Christiane Yoakim
DOI:10.1021/ja012530g
日期:2003.1.1
Johnson-type acetals derived from dimethyl tartrate give, after opening with Me(2)BBr and cuprate displacement, secondary alcohols with high diastereoselectivity (>30:1). The mechanism proposed for the induction of diastereoselectivity is downstream from the ring fission. It implies a direct participation of the Lewis acid as a source of nucleophile and the stereospecific transformation of the resulting