established. The possible intermediate for this transformation was trapped by its Diels-Alder reaction with N-ethyl maleimide. Thus the reaction may proceed via the sequential processes involving [1,5]-hydrogen migration and electrocyclization.
已经建立了从 1,2,4Z,7-四烯的环异构化合成八元
双环化合物的有效方案。这种转化的可能中间体被其与 N-乙基马来
酰亚胺的 Diels-Alder 反应所捕获。因此,反应可以通过涉及[1,5]-氢迁移和电环化的顺序过程进行。