title: [Synthesis of a branched pentasaccharide sequence of "bisected" structure of N-glycoproteins].
abstract: For the synthesis of the threefold-branched pentasaccharide, O-alpha-D-mannopyranosyl-(1----3)-O-[(2-acetamido-2-deoxy-beta-D- glucopyranosyl)-(1----4)]-O-[alpha-D-mannopyranosyl-(1----6)]-O-beta-D- mannopyranosyl-(1----4)-2-acetamido-2-deoxy-D-glucopyranose (20), which is a part of the structure of the N-glycoproteins, the disaccharide 4-O-(4-O-acetyl-3,6-di-O-allyl-2-O-benzyl-beta-D-mannopyranosyl) -1,6-anhydro-2-azido-3-O-benzyl-2-deoxy-beta-D-glucopyranose was synthesized as a key compound by use of the silver silicate-catalyst procedure. After elimination of the 4-O-acetyl group, a 2-acetamido-2-deoxy-beta-D-glucopyranosyl group was attached according to the phthalimido method. Further elimination of the allyl groups allowed the linkage of two alpha-D-mannopyranosyl groups in the presence of mercury salt. A deblocking sequence consisting of four steps gave 20.
mesh_terms: D002240:Carbohydrate Sequence; D006023:Glycoproteins; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D009844:Oligosaccharides / Q000138:chemical synthesis*; D009904:Optical Rotation
chemical_list: D006023:Glycoproteins; D007202:Indicators and Reagents; D009844:Oligosaccharides
vernacular_title: Synthese einer verzweigten Pentasaccharid-Sequenz der "bisected" Struktur von N-Glycoproteinen.