2-(trimethylsilyl)ethyl 3,4-di-O-benzoyl-2-O-benzyl-α-L-fucopyranosyl-(1→3)-4,6-O-benzylidene-2-deoxy-2-(2,2,2-trichloroethoxycarbonylamino)-β-D-galactopyranosyl-(1→4)-6-O-benzyl-2-deoxy-2-(2,2,2-trichloroethoxycarbonylamino)-β-D-glucopyranoside 、
3,4-di-O-benzoyl-2-O-benzyl-α-L-fucopyranosyl-(1→2)-3,4-di-O-acetyl-α-L-fucopyranosyl trichloroacetimidate 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 12.0h,
以67%的产率得到2-(trimethylsilyl)ethyl 3,4-di-O-benzoyl-2-O-benzyl-α-L-fucopyranosyl-(1→3)-4,6-O-benzylidene-2-deoxy-2-(2,2,2-trichloroethoxycarbonylamino)-β-D-galactopyranosyl-(1→4)-[3,4-di-O-benzoyl-2-O-benzyl-α-L-fucopyranosyl-(1→2)-3,4-di-O-acetyl-α-L-fucopyranosyl-(1→3)]-6-O-benzyl-2-deoxy-2-(2,2,2-trichloro-ethoxycarbonylamino)-β-D-glucopyranoside