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
FLEMING, PAUL R.;SHARPLESS, K. BARRY, J. ORG. CHEM., 56,(1991) N, C. 2869-2875
作者:FLEMING, PAUL R.、SHARPLESS, K. BARRY
DOI:——
日期:——
Fine regioselective tuning in the oxidation of sec,sec 1,2-diols by dimethyldioxirane
作者:Paolo Bovicelli、Anna Sanetti、Paolo Lupattelli
DOI:10.1016/0040-4020(96)00615-1
日期:1996.8
Non symmetric sec,sec 1.2-diols and their O-isopropylidene derivatives undergo a regioselectiveoxidation by dimethyldioxirane depending on the electronic effects of the substituents. These results support previous views about the concerted -insertion mechanism via a polar transition state.