title: Artificial carbohydrate antigens: the synthesis of a tetrasaccharide hapten, a Shigella flexneri O-antigen repeating unit.
abstract: The 8-methoxycarbonyloctyl glycoside of the tetrasaccharide hapten, O-alpha-L-rhamnopyranosyl-(1 leads to 2)-O-alpha-L-rhamnopyranosyl-(1 leads to 3)-O-alpha-L-rhamnopyranosyl-(1 leads to 3)-2-acetamido-2-deoxy-beta-D-glucopyranoside and the trisaccharide glycoside 8-methoxycarbonyloctyl O-alpha-L-rhamnopyranosyl-(1 leads to 3)-O-alpha-L-rhamnopyranosyl-(1 leads to 3)-2-acetamido-2-deoxy-beta-D-glucopyranoside were synthesized by sequential Koenigs-Knorr reactions from monosaccharide units. The tetrasaccharide represents the complete skeletal repeating unit of Shigella flexneri serogroup Y lipopolysaccharide. Both oligosaccharide haptens are functionalized for covalent attachment to proteins, cell surfaces, and solid supports. 1H-N.m.r. evidence for the conformations of these oligosaccharides in solution is presented and shown to be consistent with predictions based on the exo-anomeric effect.
mesh_terms: D000117:Acetylglucosamine / Q000031:analogs & derivatives; D000942:Antigens, Bacterial / Q000138:chemical synthesis*; D002236:Carbohydrate Conformation; D006241:Haptens / Q000138:chemical synthesis*; D009844:Oligosaccharides / Q000138:chemical synthesis; D012210:Rhamnose / Q000031:analogs & derivatives; D012763:Shigella flexneri / Q000276:immunology*; D014312:Trisaccharides / Q000138:chemical synthesis
chemical_list: D000942:Antigens, Bacterial; D006241:Haptens; D009844:Oligosaccharides; D014312:Trisaccharides; D012210:Rhamnose; D000117:Acetylglucosamine