title: Synthesis, from cellobiose, of a trisaccharide closely related to the GlcNAc----GlcA----GlcN segment of the antithrombin-binding sequence of heparin.
abstract: O-(2-Deoxy-2-sulfamido-6-O-sulfo-alpha-D-glucopyranosyl)-(1----4)- O-(beta-D- glucopyranosyluronic acid)-(1----4)-1,6-anhydro-2-deoxy-2-sulfamido-6-O-sulfo-beta-D-gl ucopyranose pentasodium salt (14) was synthesized as a heparin-related oligosaccharide. The glycosyl acceptor (derived from cellobiose) and a glycosyl donor, 6-O-acetyl-2-azido-3,4-di-O-benzyl-2-deoxy-alpha-D-glucopyranosyl bromide, were coupled in the presence of mercuric bromide and molecular sieves 4A to afford a 69% yield of fully protected trisaccharide, namely, O-(6-O-acetyl-2-azido-3,4-di-O-benzyl-2-deoxy-alpha-D-glucopyranosyl)-(1 ----4)- O-(methyl 2,3-di-O-benzyl-beta-D-glucopyranosyluronate)-(1----4)-3-O-acetyl- 1,6-anhydro-2 - azido-2-deoxy-beta-D-glucopyranose (10), which was converted into the partially sulfated trisaccharide 14. Compound 10 also underwent acetolysis to afford the glycosyl acetate, for further elongation of the glycosyl chain.
mesh_terms: D000990:Antithrombin III / Q000378:metabolism*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002475:Cellobiose; D006493:Heparin / Q000378:metabolism*; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D009844:Oligosaccharides / Q000138:chemical synthesis*; D009904:Optical Rotation
chemical_list: D007202:Indicators and Reagents; D009844:Oligosaccharides; D002475:Cellobiose; D000990:Antithrombin III; D006493:Heparin