AuBr3 mediated glycosidations: synthesis of tetrasaccharide motif of the Leishmania donovani lipophosphoglycan
作者:Gopalsamy Sureshkumar、Srinivas Hotha
DOI:10.1007/s10719-012-9400-7
日期:2012.5
Tetrasaccharide cap present in lipophosphoglycan of the Leishmania donovani responsible for visceral Leishmaniaisis is synthesized as a fully protected propargyl glycoside. AuBr3 mediated selective glycosylation of propargyl 1,2-orthoester in the presence of propargyl glycoside is employed as a key step to obtain propargyl containing oligomers. Further, propargyl tetrasaccharide is connected with a long chain hydrocarbon containing azidothiol functionality situated at two terminal ends via ‘click’ reaction.
在导致内脏利什曼病的唐氏利什曼原虫脂磷聚糖中存在的四糖帽被合成为完全保护的丙炔糖苷。在丙炔糖苷存在的情况下,采用 AuBr3 介导的丙炔 1,2-orthoester 选择性糖基化是获得含丙炔的低聚物的关键步骤。此外,丙炔四糖通过 "点击 "反应与位于两个末端的含有叠氮硫醇官能团的长链碳氢化合物连接。