A. K. Ray, A. Sarkar, N. Roy
Jul 1, 1989
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Journal
Journal of Carbohydrate Chemistry
Abstract
Abstract Methyl 4-O-(2,3,4,6-tetra-O-acetyl- β -D-galactopyranosyl)-2,3-O-isopropylidene- α -L-rhamnopyranoside was obtained by condensing methyl 2,3-O-isopropylidene- α -L-rhamnopyranoside with acetobromogalactose. This compound was benzylated, the iso-propylidene group was removed and the product was then partially benzylated to give methyl 2-O-benzyl-4-O-(2,3,4,6-tetra-O-benzyl-β -D-galactopyranosyl)- α -L-rhamnopyranoside. Koenigs Knorr condensation of this compound with methyl (2,3,4-tri-O-acetyl-α -D-glucopyranosyl bromide) uronate gave a trisaccharide derivative which after deprotection gave the title trisaccharide.