Efficient Synthesis of a Sialic Acid α(2→3)Galactose Building Block and Its Application to the Synthesis of Ganglioside GM3
作者:Yunpeng Liu、Xiaohong Ruan、Xiangpeng Li、Yingxia Li
DOI:10.1021/jo800138p
日期:2008.6.1
with up to 73% yield and 8.4:1 stereoselectivity, was realized when 2,3,4-unprotected galactose derivatives and TBSOTf were used as acceptors and promoter, respectively. Sialylation of 2-(trimethylsilyl)ethyl 6-O-tert-butyldiphenylsilyl-β-d-galactopyranoside (3f) gave the best result, and the resultant Neu5Ac α(2→3)Gal disaccharide was successfully used in the synthesis of ganglioside GM3.
研究了以O-乙酰化唾液酸N-苯基三氟乙酰亚氨酸酯为供体的各种半乳糖衍生物的糖基化。当分别将2,3,4-未保护的半乳糖衍生物和TBSOTf用作受体和启动子时,实现了半乳糖的高效α(2,3)唾液酸化,产率高达73%,立体选择性高达8.4:1。的2-唾液酸化(三甲基硅烷基)乙基-6- ø -叔-butyldiphenylsilyl-β-d吡喃半乳糖苷(3F),得到最好的结果,并且将所得的Neu5Acα(2→3)半乳糖二糖在神经节苷脂GM3的合成成功地用于。