中文摘要：

将选择性保护的乳糖二醇与Lewis^x三糖在N-碘代丁二酰亚胺（NIS）／TfOH催化下高立体、高区域选择性糖苷化得Lewis^x五糖，后者脱保护后获得目标五糖，总收率67．7％．化合物结构经NMR．MS和元素分析确证．

英文摘要：

This paper describes an efficient synthesis of Lewis^x pentasaccharide （1） based on a highly stereo- and regio-selective glycosylation. A lactoside diol was glycosylated with phenyl 6-O-benzyl-2-deoxy-2- phthalimido-4-O-（2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl）-1-thio-3-O-（2,3,4-tri-O-benzyl-α-L-fucopy ranosyl）-β-D-glucopyranoside （2） to give a pentasaccharide （4） which, after deprotection, afforded the target pentasaccharide.