title: Preparative route to N-glycolylneuraminic acid phenyl 2-thioglycoside donor and synthesis of Neu5Gc-alpha-(2-->3')-lactosamine 3-aminopropyl glycoside.
abstract: The spacer-armed trisaccharide, Neu5Gc-alpha-(2-->3')-lactosamine 3-aminopropyl glycoside, was synthesized by regio- and stereoselective sialylation of the suitably protected triol acceptor, 3-trifluoroacetamidopropyl 2-acetamido-3,6-di-O-benzyl-2-deoxy-4-O-(6-O-benzyl-beta-D-galactopyranosyl)-beta-D-glucopyranoside, with the donor methyl [phenyl 5-acetoxyacetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-2-thio-D-glycero-alpha,beta-D-galacto-2-nonulopyranosid]onate. The donor was obtained, in turn, from methyl [phenyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-2-thio-D-glycero-alpha,beta-D-galacto-2-nonulopyranosid]onate by N-tert-butoxycarbonylation of the acetamido group followed by total N- and O-deacetylation, per-O-acetylation, subsequent Boc group removal, and N-acetoxyacetylation.
authors.affiliation: N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 B-334, Moscow, Russia.
authors.forename: Andrei A
authors.initials: AA
authors.lastname: Sherman
authors.forename: Olga N
authors.initials: ON
authors.lastname: Yudina
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Shashkov
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Menshov
authors.forename: Nikolay E
authors.initials: NE
authors.lastname: Nifantiev
mesh_terms: D006031:Glycosylation; D009844:Oligosaccharides / Q000737:chemistry; D013865:Thioglycosides / Q000138:chemical synthesis* / Q000737:chemistry; D014312:Trisaccharides / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: C460502:Neu5Gc-(2-3')-lactosamine 3-aminopropyl glycoside; D009844:Oligosaccharides; D013865:Thioglycosides; D014312:Trisaccharides; C016735:sialooligosaccharides