Chemical synthesis of β-d-psicofuranosyl disaccharides
摘要:
Disaccharides composed of a beta-D-psicofuranosyl unit were prepared by the glycosylation reaction of monosaccharide acceptors including three 23,4,6-tetra-O-protected hexopyranoses with a D-psicofuranosyl benzyl phthalate derivative (4). A beta-D-psicofuranosidic bond was formed by the TMSOTf-promoted reaction with high selectivity. Removal of the O-protecting groups from the resulting a-D-hexopyranosyl beta-D-psicofuranosides furnished the first chemical synthesis of alpha-D-gluco-, alpha-D-galacto-, and et-D-mannopyranosyl beta-D-psicofuranosides. The common beta-D-psicofuranosyl donor 4 was derived efficiently from D-psicose in five steps. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of (+)-sucrose via β-d-psicofuranosylation
摘要:
Despite the difficulty of direct beta-furanosylation with D-fructose, the synthesis of beta-D-fructofuranosyl alpha-D-glucopyranoside, (+)-sucrose 1, has been achieved stepwise, via beta-selective D-psicofuranosylation followed by stereo inversion of a hydroxy group at the C-3 position on the furanose ring. D-Psicofuranosyl donor 10 was prepared in eight steps from D-ribose monoacetomide 3 in excellent yield. (C) 2008 Elsevier Ltd. All rights reserved.
Synthesis of (+)-sucrose via β-d-psicofuranosylation
作者:Jun’ichi Uenishi、Atsushi Ueda
DOI:10.1016/j.tetasy.2008.09.008
日期:2008.9
Despite the difficulty of direct beta-furanosylation with D-fructose, the synthesis of beta-D-fructofuranosyl alpha-D-glucopyranoside, (+)-sucrose 1, has been achieved stepwise, via beta-selective D-psicofuranosylation followed by stereo inversion of a hydroxy group at the C-3 position on the furanose ring. D-Psicofuranosyl donor 10 was prepared in eight steps from D-ribose monoacetomide 3 in excellent yield. (C) 2008 Elsevier Ltd. All rights reserved.
Chemical synthesis of β-d-psicofuranosyl disaccharides
Disaccharides composed of a beta-D-psicofuranosyl unit were prepared by the glycosylation reaction of monosaccharide acceptors including three 23,4,6-tetra-O-protected hexopyranoses with a D-psicofuranosyl benzyl phthalate derivative (4). A beta-D-psicofuranosidic bond was formed by the TMSOTf-promoted reaction with high selectivity. Removal of the O-protecting groups from the resulting a-D-hexopyranosyl beta-D-psicofuranosides furnished the first chemical synthesis of alpha-D-gluco-, alpha-D-galacto-, and et-D-mannopyranosyl beta-D-psicofuranosides. The common beta-D-psicofuranosyl donor 4 was derived efficiently from D-psicose in five steps. (C) 2010 Elsevier Ltd. All rights reserved.