Efficient synthesis of 3′-glycosylated LacNAc-based oligosaccharides

LacNAc-based oligosaccharides, including sialyl-(2→3)-LacNAc, dimeric sialyl-(2→3)-LacNAc, trimeric sialyl-(2→3)-LacNAc, β-glucuronyl-(1→3)-LacNAc, and 3-sulfo-β-Glucuronyl-(1→3)-LacNAc, were synthesized efficiently from a single protected LacNAc derivative having both OH-3′ and 4′ unprotected.