Oligosaccharides are involved in numerous biological processes. Achieving optimal anomeric selectivity and regioselectivity remains challenging. Herein, we present a method for the oxidative glycosylation of thioglycosides with hypervalent iodine reagents derived from carboxylic acid to form C–O bonds. The reaction of thioglycosides with various hypervalent iodine carboxylates afforded acyl O-glycosyl compounds. These acyl O-glycosyl compounds could react with thioglycoside acceptors to produce disaccharides; trisaccharides and tetrasaccharides could be synthesized by repeating this method.

中文翻译：

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酰基糖苷的无金属合成及其在低聚糖合成中的应用

寡糖参与许多生物过程。实现最佳端基异构选择性和区域选择性仍然具有挑战性。在此，我们提出了一种硫苷氧化糖基化与衍生自羧酸的高价碘试剂形成 C-O 键的方法。硫代糖苷与各种高价碘羧酸盐反应得到酰基O-糖基化合物。这些酰基O-糖基化合物可与硫糖苷受体反应生成二糖；重复该方法可合成三糖和四糖。