Asymmetric synthesis with carbohydrates. Part 2. Asymmetric grignard addition reactions conditioned by chiral magnesium alkoxides
Abstract
Enantioselective Grignard addition reactions are described in which magnesium alkoxides derived from 1,2:5,6-di-O-isopropylidene-α-D-allofuranose and 1,6-dideoxy-3,4-O-isopropylidene-2,5-di-C-methyl-L-threo-hexitol are used to provide chiral complexation of the Grignard reagent. A stereochemical interpretation of these and other results is presented.