Synthesis of β‐Keto Lactone with Basic Skeleton of Przewalskin B

Abstract

The synthesis of β‐keto lactone was completed using cyclohexanone as starting material. The α,β‐unsaturated lactone was obtained through Reformatsky reaction and iodolactonization. The aforementioned lactone was converted into target compound 1 (β‐keto lactone) by Nef oxidation and Claisen condensation in six steps with 17.9% overall yield.