Abstract
The title tetrasaccharide, namely, O-β- d-glucopyranosyl-(1→2)- O-[β- d-xylopyranosyl-(1→3)]- O-β- d-glucopyranosyl- (1→4)- d-galactose, has been synthesized by Koenigs-Knorr type of condensations in a stepwise manner by way of the preperation of the di- and tri-saccharide fragments, 4- O-β- d-glucopyranosyl- d-galactose (lycobiose) and O-β- d-glucopyranosyl-(1→2)- O-β- d-glucopyranosyl-(1→4)- d-galactose (lycotriose I), using benzyl 2,3,6-tri- O-benzyl-β- d-galactopyranoside as the starting glycosyl acceptor, and 2,3,4,6-tetra- and 2,4,6-tri- O-acetyl-3- O-allyl-α- d-glucopyranosyl bromide and 2,3,4-tri- O-benzoyl-α- d-xylopyranosyl bromide as the glycosyl donors.
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