A new general method for preparation of 3-acyl-4-hydroxy-2-pyrones has been developed. The new method includes a Fries type rearrangement of enol-acyl group toward adjacent carbon atom, by which the new and potent fungicides, podoblastin A, B and C have been synthesized for the confirmation of the structures.
开发了一种制备 3-酰基-
4-羟基-2-
吡喃酮的新通用方法。新方法包括烯醇-酰基向邻近碳原子的弗里斯式重排,通过这种方法合成了新型强效杀菌剂荚膜菌素 A、B 和 C,并对其结构进行了确认。