N-Dimethylphosphoryl-protection in the efficient synthesis of glucosamine-containing oligosaccharides with alternate N-acyl substitutions

Ready transformation of N-dimethylphosphoryl-protection into the corresponding N-acyl derivatives (in the presence of acyl chlorides and DMAP in pyridine) provided an effective approach to the synthesis of glucosamine-containing oligosaccharides with alternate N-acyl substitutions.