作者:Hidde Elferink、Rens A. Mensink、Paul B. White、Thomas J. Boltje
DOI:10.1002/anie.201604358
日期:2016.9.5
The stereoselective synthesis of glycosidic bonds is the main challenge of oligosaccharide synthesis. Neighboring‐group participation (NGP) of C2 acyl substituents can be used to provide 1,2‐trans‐glycosides. Recently, the application of NGP has been extended to the preparation of 1,2‐cis‐glycosides with the advent of C2 chiral auxiliaries. However, this methodology has been strictly limited to the
糖苷键的立体选择性合成是寡糖合成的主要挑战。C2酰基取代基的邻近基团参与(NGP)可用于提供1,2-反式-糖苷。最近,随着C2手性助剂的出现,NGP的应用已扩展到1,2-顺式糖苷的制备。但是,这种方法严格限于合成1,2-顺式葡萄糖型糖。本文报道了新型甘露糖基供体的设计和合成,该供体通过NGP硫醚助剂提供1,2-顺式-甘露糖苷。设计中的关键要素是使用1 C 4锁定甘露糖醛酸内酯,以使C2助剂具有NGP。除了C2参与外,还确定了C4苄基的一种新的远程参与模式,并提供了1,2-顺式甘露糖苷。