N-Heterocyclic Carbene Catalyzed Stereoselective Glycosylation of 2-Nitrogalactals.

An efficient N-heterocyclic carbene catalyzed glycosylation of 2-nitrogalactals with alcohols and phenol has been developed for the first time. A wide variety of 1,2-cis-2-nitroglycosides can be obtained with good to excellent yields and high to excellent α-selectivities.