3,6-di-O-acetyl-2-deoxy-2-phthalimido-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-β-D-glucopyranosyl bromide 、
p-nitrophenyl 3-O-benzoyl-4,6-di-O-benzylidene-α-D-mannopyranoside 在
2,4,6-三甲基吡啶 、 3 A molecular sieve 、
silver trifluoromethanesulfonate 作用下,
以
二氯甲烷 为溶剂,
以60%的产率得到p-nitrophenyl 2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl-(1->4)-O-3,6-di-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl-(1->2)-O-3-O-benzoyl-4,6-di-O-benzylidene-α-D-mannopyranoside