Regio- and stereoselectivity of the addition of O-, S-, N-, and C-nucleophiles to the β vinyl oxirane derived from D-glucal

6-O-Trityl- (1a) and 6-(O-benzyl)-substituted epoxide (1b) derived from D-glucal were examined in their addition reactions with O-, C-, N-, and S-nucleophiles. A 1,4-regio- and beta-stereoselective or an anti 1,2-addition pathway is commonly observed depending on the ability of the nucleophile to coordinate with the oxirane oxygen. When TMSN3 or LiN3 are used as azide-based nucleophiles, a 1,2-syn-addition pathway is also observed,