phenyl 3,6-di-O-benzyl-4-O-chloroacetyl-2-deoxy-1-thio-2-(2,2,2-trichloroethoxycarbamoyl)-β-D-glucopyranoside 、 2-(trimethylsilyl)ethyl 3,6-di-O-benzyl-2-deoxy-4-O-levulinoyl-2-(2,2,2-trichloroethoxycarbamoyl)-β-D-glucopyranosyl-(1→3)-2-O-benzoyl-β-D-galactopyranoside 在
N-碘代丁二酰亚胺 、
三氟甲磺酸 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以49%的产率得到2-(trimethylsilyl)ethyl 3,6-di-O-benzyl-2-deoxy-4-O-levulinoyl-2-(2,2,2-trichloroethoxycarbamoyl)-β-D-glucopyranosyl-(1→3)-[3,6-di-O-benzyl-4-O-chloroacetyl-2-deoxy-2-(2,2,2-trichloroethoxycarbamoyl)-β-D-glucopyranosyl-(1→6)]-2-O-benzoyl-β-D-galactopyranoside