title: Synthesis of the tetrasaccharide repeating unit of the antigen from Klebsiella type 20.
abstract: Starting from D-mannose, D-galactose and D-glucuronolactone, two disaccharide blocks, namely methyl 4,6-di-O-benzyl-2-O-(2,3,4,6-tetra-O-benzyl-beta-D-galactopyranosyl)- alpha-D-mannopyranoside, acting as acceptor, and ethyl 4,6-di-O-acetyl-2-O-allyl-3-O-(methyl 2,3,4-tri-O-acetyl-beta-D-gluco-pyranosyluronate)-1-thio-beta-D- galactopyranoside, acting as donor, were synthesised. The two disaccharides were then allowed to react to give, after deprotection, methyl 2-O-beta-D-galactopyranosyl-3-O-(3-O-beta-D-glucopyranosyluronic acid-alpha-D-galactopyranosyl)-alpha-D-mannopyranoside which is the methyl glycoside of the tetrasaccharide repeating unit of the said antigen.
authors.affiliation: Department of Biological Chemistry, Indian Association for the Cultivation of Science, Calcutta.
authors.forename: S K
authors.initials: SK
authors.lastname: Das
authors.forename: N
authors.initials: N
authors.lastname: Roy
mesh_terms: D016667:Bacterial Capsules / Q000737:chemistry*; D002240:Carbohydrate Sequence; D007709:Klebsiella / Q000276:immunology*; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009844:Oligosaccharides / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D009844:Oligosaccharides