Ganglioside GQ1b: Efficient Total Synthesis and the Expansion to Synthetic Derivatives To Elucidate Its Biological Roles
作者:Akihiro Imamura、Hiromune Ando、Hideharu Ishida、Makoto Kiso
DOI:10.1021/jo8027888
日期:2009.4.17
The convergent total synthesis of ganglioside GQ1b based on the “cassette approach” between the nonreducing end GQ1b-core heptasaccharide and glucosylceramide building blocks was accomplished in high overall yield. The use of a sialylα(2→8)sialylα(2→3)galactose sequence as the key building block enhanced the efficiency of the glycan assembly and led to preparative-scale synthesis readily applicable
基于“盒式方法”,在非还原性末端GQ1b核心七糖和葡萄糖基神经酰胺结构单元之间实现了神经节苷脂GQ1b的聚合全合成,从而获得了较高的总收率。使用唾液酸基α(2→8)唾液酸基α(2→3)半乳糖序列作为关键构建基块提高了聚糖组装体的效率,并导致易于用于大规模制备的制备规模合成。另外,p的明智选择葡糖神经酰胺上的-甲氧基苄基保护基为先前的合成问题提供了解决方案,包括降低脱保护步骤的收率,并导致总收率的提高。此外,为了阐明其生物学作用,利用相似的方法系统地合成了高产率的非天然GQ1b衍生物。