An Improved Synthesis of 3,4,6-Tri-O-acetyl-2-azido-2-deoxy-α-d-galactopyranosyl Bromide: A Key Component for Synthesis of Glycopeptides and Glycolipids

Abstract
Results and discussion The α-glycosidic bond between N-acetylgalactosamine and serine or threonine is one of the most important linkages between the carbohydrate and peptide parts of O-glycoproteins.1 This linkage is found in mucous glycoproteins and is also a characteristic of many serum and membrane bound glycoproteins, including proteins containing the tumour associated TN and T antigens. α-O-Glycosidically linked N-acetylgalactosamine also occurs in the blood group A determinant2 and in glycolipids such as the Forssman antigen.3