Abstract Condensation of 1, 2, 3, 4, 6-penta-O-acetyl-β-d-galactopyranose with methyl 3, 6- di-O-benzyl-2-deoxy-2-phthalimido-β-d-glucopyranoside, followed by alkaline methanolysis, gave a derivative of lactosamine that has an unsubstituted β-d-galactopyranosyl group. Tributyltin oxide-mediated allylation gave a good yield of the 3′-O-allyl (9) and a poor yield of the 3′, 6′-di-O-allyl ether (8). Protection of 9 at O-6′ was achieved by reductive ...
