1,6-anhydro-N-acetyl-beta-D-glucosamine in the oligosaccharide syntheses. I. Synthesis of 3-acetate and 3-benzoate of 1,6-anhydro-N-acetyl-beta-D-glucosamine via the 4-O-trityl derivative

3-O-Acetyl and 3-O-benzoyl derivatives of 1,6-anhydro-N-acetyl-beta-D-gluco samine were synthesized via its selective tritylation followed by the 3-O-a cylation and removal of the trityl protective group. Tritylium trifluoromet hanesulfonate, which can easily be prepared by mixing solutions of tripheny lcarbinol and trimethylsilyl trifluoromethanesulfonate in an equimolar rati o, was suggested as a reagent for the effective tritylation of a secondary hydroxyl group.