3-O-allyl-2,4,6-tri-O-benzyl-D-galactopyranosyl chloride 、
2-(trimethylsilyl)ethyl 2,3,6-tri-O-benzoyl-β-D-galactopyranoside 在
silica gel silver trifluoromethanesulfonate 、
1,1,3,3-四甲基脲 作用下,
以
甲苯 为溶剂,
以75%的产率得到2-(Trimethylsilyl)ethyl-2,3,6-tri-O-benzoyl-4-O-(3-O-allyl-2,4,6-tri-O-benzyl-α-D-galactopyranosyl)-β-D-galactopyranoside