S-cyanomethyl 2-N-acetimido-6-O-acetyl-3-O-[3,4,6-tri-O-acetyl-β-D-galactopyranose]-2-deoxy-1-thio-β-D-glucopyranoside 、 S-ethyl 2,3,4-tri-O-p-methoxybenzyl-6-deoxy-1-thio-β-L-galactopyranoside 在
四丁基溴化铵 、
copper(ll) bromide 作用下,
以
二氯甲烷 、
N,N-二甲基甲酰胺 为溶剂,
以77%的产率得到S-cyanomethyl 2-N-acetamido-6-O-acetyl-4-O-[2,3,4-tri-O-p-methoxybenzyl-6-deoxy-α-L-galactopyranosyl]-3-O-[2-(2,3,4-tri-O-p-methoxybenzyl-6-deoxy-α-L-galactopyranosyl)-3,4,6-tetra-O-acetyl-β-D-galactopyranosyl]-2-deoxy-1-thio-β-D-glucopyranoside