Synthesis of oligosaccharides containing β-d-Gal-(1→3)-O-(6-O-sulfo-β-d-GlcNAc) as a terminal unit

The chemical synthesis of β-d-Gal-(1→3)-6-O-SO3Na-β-d-GlcNAc-(1→6)-α-d-Man-O-C6H4NO2 (1) and β-d-Gal-(1→3)-6-O-SO3Na-β-d-GlcNAc-(1→2)-α-d-Man-OMe (2) is reported using a key glycosyl donor, phenyl O-(2,3,4,6-tetra-O-acetyl-β-d-galactopyranosyl)-(1→3)-4,6-di-O-chloroacetyl-2-deoxy-2-phthalimido-1-thio-β-d-glucopyranoside (3).