Convenient access to 4-O-glycosylated 1,5-anhydro-d-fructoses via disaccharide-derived 2-hydroxyglycal esters
摘要:
Efficient six-step protocols are described for the conversion of common disaccharides, such as maltose, cellobiose, or lactose, into the corresponding 4-O-glycosyl-1,5-anhydro-D-fructoses. Overall yields of 40-45% are favorably compared to the alternative eleven-step procedure from their monosaccharide components (similar to 15%). (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of 4-O-glycosylated 1,5-anhydro-d-fructose and of 1,5-anhydro-d-tagatose from a common intermediate 2,3-O-isopropylidene-d-fructose
作者:Károly Agoston、Gyula Dékány、Inge Lundt
DOI:10.1016/j.carres.2009.03.005
日期:2009.5
Four novel disaccharides of glycosylated 1,5-anhydro-D-ketoses have been prepared: 1,5-anhydro-4-O-beta-D-glucopyranosyl-D-fructose, 1,5-anhydro-4-O-beta-D-galactopyranosyl-D-fructose, 1,5-anhydro-4-O-beta-D-glucopyranosyl-D-tagatose, and 1,5-anhydro-4-O-beta-D-galactopyranosyl-D-tagatose. The common intermediate, 1,5-anhydro-2,3-O-isopropylidene-beta-D-fructopyranose, was prepared from D-fructose and was converted into the D-tagatose derivative by oxidation followed by stereoselective reduction to the 4-epimer. The anhydroketoses thus prepared were glycosylated and deprotected to give the disaccharides. (C) 2009 Elsevier Ltd. All rights reserved.
Convenient access to 4-O-glycosylated 1,5-anhydro-d-fructoses via disaccharide-derived 2-hydroxyglycal esters
作者:Toshio Nakagawa、Frieder W. Lichtenthaler
DOI:10.1016/j.tetasy.2011.03.005
日期:2011.4
Efficient six-step protocols are described for the conversion of common disaccharides, such as maltose, cellobiose, or lactose, into the corresponding 4-O-glycosyl-1,5-anhydro-D-fructoses. Overall yields of 40-45% are favorably compared to the alternative eleven-step procedure from their monosaccharide components (similar to 15%). (C) 2011 Elsevier Ltd. All rights reserved.