5-endo and 6-exo thiolactonizations of alkenes. Two types of lactones were obtained with up to 95% ee and 99% yield. Additionally, this methodology has been applied in the formal syntheses of bioactive natural products (−)-nicotlactone B and (−)-galbacin.
基于不饱和
羧酸的路易斯碱催化的对映选择性亚磺酰基化,已经描述了制备手性亚磺酰基化内酯的有效方法。该方法的范围包括两个对映选择性环化反应:烯烃的5-内
硫基和6-外
硫醇内酯化。获得了两种类型的内酯,它们的ee高达95%,产率高达99%。此外,该方法已应用于
生物活性
天然产物(-)-烟酰胺内酯B和(-)-半
乳糖苷的正式合成中。