The acid-catalysed formation of glycosidic bonds is more difficult when glycosyl donors are fluorinated, especially at the 2-position. Here we report high-yielding glycosidation and glycosylation reactions of 2,3-difluorinated- and 2,3,4-trifluorinated gluco- and galactopyranoside donors with a variety of acceptors under conventional trichloroacetimidate/TMSOTf activation in moderate to high anomeric
当糖基供体被
氟化时,尤其是在 2-位,酸催化的糖苷键形成更加困难。在这里,我们报道了在传统的三
氯乙
酰亚胺酯/TMSOTf活化下,2,3-二
氟化-和2,3,4-三
氟化
葡萄糖-和
吡喃半
乳糖苷供体与各种受体在中等到高异头选择性下发生高产糖苷化和糖基化反应。该方法允许获得高度
氟化的聚糖,以五
氟化二糖的合成为例。