A series of glycosyl hemiacetal derivatives have been transformed into thioglycosides and glycosyl thiols in a one-pot two-step reaction sequence mediated by Appel reagent (carbon tetrabromide and triphenylphosphine). 1,2-trans-Thioglycosides and β-glycosyl thiol derivatives were stereoselectively formed by the reaction of the in situ generated glycosyl bromides with thiols and sodium carbonotrithioate. The reaction conditions are reasonably simple and yields were very good.
一系列的糖基半缩醛衍生物已经通过一锅两步反应序列(介导剂为Appel试剂(四溴化碳和三苯基膦))转化为硫代糖苷和糖基硫醇。通过原位生成的糖基溴化物与硫醇和碳硫代酸钠反应,选择性地形成了1,2-trans-硫代糖苷和β-糖基硫醇衍生物。反应条件相当简单,产率非常高。