4,6-di-O-acetyl-3-O-(tetra-O-acetyl-β-D-galactopyranosyl)-2-deoxy-2-phthalimido-α,β-D-glucopyranosyl chloride 、
双丙酮半乳糖 在
2,4,6-三甲基吡啶 、
silver trifluoromethanesulfonate 作用下,
以
硝基甲烷 为溶剂,
以76%的产率得到6-O-<4,6-di-O-acetyl-3-O-(tetra-O-acetyl-β-D-galactopyranosyl)-2-deoxy-2-phthalimido-β-D-glucopyranosyl>-1,2;3,4-di-O-isopropylidene-α-D-galactopyranose