Catalytic, Stereoselective Glycosylation - Spiroketalization of 3,4,5-Tri-O-benzyl-b-D-fructopyranose Generating Di-D-fructopyranose- 1,2’:2,1’-dianhydride
摘要:
alpha-D-Fructopyranose beta-D-fructopyranose-1,2':2,1'-dianhydride has been stereoselectively synthesized by tandem catalytic glycosylation-spiroketalization of 3,4,5-tri-O-benzyl-beta-D-fructo- pyranose. Of the several protic acid catalysts which exist, 0.3 molar equivalent trifluoromethane sulfonic acid in toluene was found to be most effective to afford the dianhydride in good yield.
Synthesis of Di- and Trisaccharides Comprising D-Fructopyranose with β2 → 1 Glycosidic Linkage Using β-D-Fructopyranosyl Fluoride as the Fructosyl Donor
摘要:
D-Fructose was converted into a stable, suitably protected fructosyl donor for iterative glycosylation, i.e., 1-O-acetyl-3,4,5-tri-O-benzyl-beta-D-fructoyranosyl fluoride and a fructosyl acceptor, methoxymethyl 3,4,5-tri-O-benzyl-beta-D-fructopyranoside in good yields. Glycosylation of the both substrates provided di- and trisaccharides comprising beta-D-fructopyranose with beta (2 -> 1)-interglycosidic linkage.