benzyl 3-O-<4-O-(3-O-allyl-6-O-benzyl-2-O-(2,3,4,6-tetra-O-benzyl-β-D-glucopyranosyl)-β-D-galactopyranosyl)-2,3,6-tri-O-benzyl-α-D-glucopyranosyl>-2,4-di-O-benzyl-α-L-rhamnopyranoside 、
2,3,4,6-四乙酰氧基-alpha-D-吡喃葡萄糖溴化物 在
molecular sieve 、
silver trifluoromethanesulfonate 作用下,
以
二氯甲烷 、
甲苯 为溶剂,
反应 2.5h,
以77%的产率得到benzyl 3-O-<4-O-<3-O-allyl-6-O-benzyl-4-O-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)-2-O-(2,3,4,6-tetra-O-benzyl-β-D-glucopyranosyl)-β-D-galactopyranosyl>-2,3,6-tri-O-benzyl-α-D-glucopyranosyl>-2,4-di-O-benzyl-α-L-rhamnopyranoside