2,3,6-tri-benzoyl-4-O-(bromoacetyl)-α-D-galactopyranosyl chloride 、
methyl O-(2,3,6-tri-O-benzoyl-β-D-galactopyranosyl)-(1-4)-2,3,6-tri-O-benzoyl-β-D-galactopyranoside 在
2,4,6-三甲基吡啶 、
silver trifluoromethanesulfonate 作用下,
以
二氯甲烷 为溶剂,
反应 0.5h,
以35%的产率得到methyl O-<2,3,6-tri-O-benzoyl-4-O-(bromoacetyl)-β-D-galactopyranosyl>-(1-4)-O-(2,3,6-tri-O-benzoyl-β-D-galactopyranosyl)-(1-4)-2,3,6-tri-O-benzoyl-β-D-galactopyranoside