Synthesis of 3″- and 4″-deoxy-Lewisx trisaccharides: A useful tool for study of carbohydrate-carbohydrate interaction
作者:DengXiang Dong、Chafika Gourmala、YanYan Zhang、YongMin Zhang
DOI:10.1007/s11426-010-4060-6
日期:2010.9
Synthesis of 3″-deoxy and 4″-deoxy Lewisx trisaccharides is described. Phenyl 2,3,6-tri-O-benzoyl-4-deoxy-1-thio-β-d-xylo-hexopyranoside was condensed with a diol of glucosamine to give regio- and stereo-selectively a disaccharide. Stereoselective fucosylation of this disaccharide provided a protected deoxy Lewisx trisaccharide which was deprotected to give the 4″-deoxy Lewisx trisaccharide. Application of the similar synthetic sequence provided the 3″-deoxy Lewisx trisaccharide.
描述了 3″-deoxy 和 4″-deoxy Lewisx 三糖的合成。苯基 2,3,6-三-O-苯甲酰基-4-脱氧-1-硫代-β-d-氧代-己吡喃糖苷与氨基葡萄糖的二醇缩合,得到一种具有区域和立体选择性的二糖。对这种二糖进行立体选择性岩藻糖基化,可得到受保护的脱氧路易斯三糖,对其进行脱保护,可得到 4″-脱氧路易斯三糖。应用类似的合成序列可得到 3″-脱氧 Lewisx 三糖。