Facile preparation of glycosyl donors for oligosaccharide synthesis: 2-azido-2-deoxyhexopyranosyl building blocks

Abstract Facile routes to the 2-azido-2-deoxy-1-thioglycosides 6 , 7 , 15 , and 18 and of the 2-azido-2-deoxy-4-pentenoglycoside 11 , are described. These are useful intermediates for the synthesis of oligo-saccharides containing α- D -2-amino-2-deoxy (or 2-acetamido-2-deoxy) hexosyl residues in the galacto- , gluco- , and manno- series.