By turning on or switching off the directing effect of the C3–OH-located o-diphenylphosphanylbenzoyl (o-DPPB) group in glycals, a reagent-controlled protocol for divergent and regio- and stereoselective syntheses of C-glycosides has been established. In particular, the silence of the directing effect of o-DPPB was achieved by the introduction of a ZnCl2 additive, which is operationally simple and efficient
通过打开或关闭糖基中C3-OH处的邻
二苯基膦基苯甲酰基(o -
DPPB)基团的导向作用,已建立了用于C-糖苷的发散和区域和立体选择性合成的试剂控制方案。特别地,通过引入ZnCl 2添加剂实现了o -
DPPB的定向作用的沉默,该添加剂操作简单且有效。新协议的灵活性不仅表现在容易获得α-和β- C-糖苷,而且还表现出所获得的正式Ferrier重排产物的多功能性,该产物可以容易地衍生为各种C-糖苷类似物归因于嵌入式多功能性。