Ethyl 2,3,4,6-tetra-O-p-chlorobenzyl-1-thio-β-D-galactopyranoside 、 (p-Trifluoroacetamidophenyl)ethyl 4,6-O-benzylidene-2-O-(2,3,4-tri-O-p-chlorobenzyl-α-L-fucopyranosyl)-β-D-galactopyranoside 在
4 A molecular sieve 、 dimethyl(methylthio)sulfonium tetrafluoroborate 作用下,
以
四氢呋喃 、
二氯甲烷 为溶剂,
以57%的产率得到(p-Trifluoroacetamidophenyl)ethyl 3-O-(2,3,4,6-tetra-O-p-chlorobenzyl-α-D-galactopyranosyl)-4,6-O-benzylidene-2-O-(2,3,4-tri-O-p-chlorobenzyl-α-L-fucopyranosyl)-β-D-galactopyranoside