Diastereoselective Synthesis of Thioglycosides via Pd-Catalyzed Allylic Rearrangement
作者:Jiagen Li、Ming Wang、Xuefeng Jiang
DOI:10.1021/acs.orglett.1c03302
日期:2021.12.3
palladium-catalyzed allylic rearrangement yields various substituents on α-isomer thioglycosides. Two comprehensive series of aryl and benzyl thioglycosides were obtained via a combination of thiosulfates with glycals derived from glucose, arabinose, galactose, and rhamnose. Furthermore, diosgenyl α-l-rhamnoside and isoquercitrin achieved selectivity via stereospecific [2,3]-sigma rearrangements of α-sulfoxide-rhamnoside
立体选择性糖基化在碳水化合物化学中具有挑战性。在此,通过钯催化的烯丙基重排对糖醛进行立体选择性硫代糖基化,可在 α-异构体硫糖苷上产生各种取代基。通过硫代硫酸盐与衍生自葡萄糖、阿拉伯糖、半乳糖和鼠李糖的糖苷的组合,获得了两个综合系列的芳基和苄基硫糖苷。此外,薯蓣基 α-l-鼠李糖苷和异槲皮苷分别通过 α-亚砜-鼠李糖苷和 α-亚砜-葡萄糖苷的立体特异性 [2,3]-σ 重排实现了选择性。