An Easy Regio- and Stereoselective Synthesis of a Versatile Trisaccharide Precursor for Synthetic Carbohydrate Based Vaccines

Abstract
The trisaccharide allyl 2-deoxy-2-phthalimido-6-O-[4-O-(2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl)-2,3,6-tri-O-benzoyl-β-D-glucopyranosyl]-β-D-glucopyranoside (3) was prepared directly from acceptor allyl 2-deoxy-2-phthalimido-β-D-glucopyranoside (1) and 4-O-(2,3,4,6- tetra-O-benzoyl-β-D-galactopyranosyl)-2,3,6-tri-O-benzoyl-α-D-glucopyranosyl trichloroacetimidate (2c) using regio- and stereoselective synthesis in dichloromethane with trimethylsilyl triflate as a promoter.

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