Tert-Butyldimethylsilyl 2-Deoxyglycosides

Remarkable selectivity for an attack from the a-side was observed [87a] when the anomeric /7-nitro-benzoate of evernitrose 138 was reacted with the sugar alcohol 

As early as 1979 and as an application of the imidate procedure , Sinay [87b] reported the use of anomeric (A-methyl)acetimidates of 2-deoxysugars for the highly stereoselective synthesis of 2 -deoxy-a-disaccharides in excellent yields. 

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