Useful Intermediates, 3-C-Dichloromethyl Furanose Derivatives, for the Synthesis of Branched-Chain Functionalized Sugars

A few novel branched-chain functionalized sugars, which have important functions such as hydroxy, hydro, chloro, or azido at the quaternary carbon, were stereoselectively prepared in good yield via the same intermediary 3-C-,3-O-chloromethylene- or 3-C-dichloromethyl-1,2 : 5,6-di-O-isopropylidene-α-D-furanose derivatives.