2-(trimethylsilyl)ethyl 4,6-O-benzylidene-2-deoxy-2-(2,2,2-trichloroethoxycarbonylamino)-β-D-galactopyranosyl-(1→4)-2,3-di-O-benzoyl-6-O-benzyl-β-D-glucopyranoside 、
2-(trimethylsilyl)ethyl 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-β-D-galactopyranosyl-(1→4)-6-O-benzyl-3-O-chloroacetyl-2-deoxy-2-(2,2,2-trichloroethoxycarbonylamino)-β-D-glucopyranoside 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 18.0h,
以65%的产率得到2-(trimethylsilyl)ethyl 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-β-D-galactopyranosyl-(1→4)-6-O-benzyl-3-O-chloroacetyl-2-deoxy-2-(2,2,2-trichloroethoxycarbonylamino)-β-D-glucopyranosyl-(1→3)-4,6-O-benzylidene-2-deoxy-2-(2,2,2-trichloroethoxycarbonyl-amino)-β-D-galactopyranosyl-(1→4)-2,3-di-O-benzoyl-6-O-benzyl-β-D-glucopyranoside