Chemoselective glycosidation strategy based on glycosyl donors and acceptors carrying phosphorus-containing leaving groups: a convergent synthesis of ganglioside GM3
作者:Hiroki Sakamoto、Seiichi Nakamura、Toshifumi Tsuda、Shunichi Hashimoto
DOI:10.1016/s0040-4039(00)01343-5
日期:2000.9
A convergent synthesis of ganglioside GM3 has been achieved by capitalizing on three different phosphorus-containing leaving groups, in which the key features involve a chemo- and regioselective α-glycosidation of sialyl phosphite with partially benzylated galactosyl tetramethylphosphorodiamidate by the aid of trifluoromethanesulfonic acid and a traditionally uncommon coupling of an α-sialyl-(2→3)-galactosyl
通过利用三个不同的含磷离去基团,实现神经节苷脂GM 3的聚合合成,其中关键特征包括在三氟甲磺酸和三氟甲基磺酸的帮助下,将唾液酸亚磷酸酯的化学和区域选择性α-糖基化与部分苄基化的半乳糖基四甲基磷酸二氨基甲酸酯。 α-唾液酸基-(2→3)-半乳糖基供体与葡糖基神经酰胺结构单元的传统上不常见的偶联,该结构单元具有通过磷酸二苯酯方法预先构建在葡萄糖中的β- O-连接的神经酰胺。