A novel and expeditious approach to the stereoselective synthesis of 2-S-ethyl(phenyl)-2-deoxy-β-glycosides, ready precursors to 2-deoxy-β-glycosides

1,2-Migration and concurrent glycosidation of ethyl(phenyl) 2,3-orthoester-1-thio-α-l-rhamnopyranosides under the action of TMSOTf readily afforded the corresponding 2-S-ethyl(phenyl)-2-deoxy-β-glycosides, ready precursors to 2-deoxy-β-glycosides.