2-Acetamido-1,3,4,6-tetra-O-acetyl-2-deoxy-β-d-glucopyranose 2 is a starting compound in the synthesis of a number of glucosamine glycosyl donors, such as 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-α-d-glucopyranosyl chloride, 1262-methyl-(3,4,6-tri-O-acetyl-1,2-dideoxy-α-d-glucopyrano)-[2,1-d]-2-oxazoline, as well as thioglycoside derivatives of N-acetyl-d-glucosamine. It was shown that in the presence of excess of anhydrous ferric chloride in dichloromethane, the glycosyl acetate 2 easily reacted with simple alkyl and carbohydrate alcohols to give stereoselectively the corresponding 1,2-trans glycosides. Recently, a milder glycosylation procedure was proposed where the glycosyl donor 2 was used in the presence of catalytic amounts of ferric triflate or ferric triflate.dimethyl sulfoxide complex and excess of 2,4,6-tri-tert-butylpyrimidine. Despite its moderate reactivity, glycosyl donor 2 is useful because it affords glycosides and oligosaccharides with natural 2-acetamido group.
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Chapter 15: One-pot synthesis of 2-acetamido-1,3,4,6-tetra-O-acetyl-2- deoxy-β-d-glucopyranose using anomeric O-acylation by Sergey S. Pertel, Elena S. Kakayan, Sergey A. Seryi, and Anthony W. McDonagh
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