A new regioselective glycosylation strategy was used to develop a highly efficient synthesis of the dimeric Lewis X determinant linked to an azido type spacer arm. Regioselective galactosylation of 3,4 glucosamine diols 2 and 3 with galactose donor 4, followed by fucosylation provided two trisaccharide building blocks 9 and 10. The final condensation involved a 3b-regioselective glycosylation of the
一种新的区域选择性糖基化策略用于开发与
叠氮基间隔基臂相连的二聚体Lewis X决定簇的高效合成。3,4
氨基葡萄糖二醇2和3与半
乳糖供体4的区域选择性半
乳糖基化,然后岩藻糖基化提供了两个三糖结构单元9和10。最终的缩合反应涉及良好收率的2b,3b三糖二醇11的3b-区域选择性糖基化。