SYNTHESIS OF METHYL 2-O, 3-O, 4-O, 6-O, 2,3-DI-O AND I-O-BETA-D-GALACTOPYRANOSYL-BETA-D-GLUCOPYRANOSIDE

Synthesis of methyl O-beta-D-galactopyranosyl-(1 --> 2)-beta-D-glucopy ranoside 1, methyl O-beta-D-galactopyranosyl-(1 --> 3)-beta-D-glucopyr anoside 2, methyl O-beta-D-galactopyranosyl-(1 --> 4)-beta-D-glucopyra noside 3, methyl O-beta-D-galactopyranosyl-(1 --> 6)-beta-D-glucopyran oside 4, methyl O-beta-D-galactopyranosyl-(1 --> 4)-[O-beta-D-galactop yranosyl-(1 --> 6)]-beta-D-glucopyranoside 5, and methyl O-beta-D-gala ctopyranosyl-(1 --> 2)-[O-beta-D-galactopyranosyl-(1 --> 3)]-beta-D-gl ucopyranoside 6, using 2,3,4,6 tetra-O-acetyl-alpha-D-galactopyranosyl trichloroacetimidate or 2,3,4,6 tetra-O-acetyl-alpha-D-galactopyranos yl bromide as a glycosyl donor and selectively protected derivatives o f methyl O-beta-D-glucopyranoside as glycosyl accepters are described.