The compact tricyclic substructure of solanoeclepin A containing the cyclobutanone ring was prepared by using as the key step a highly regioselective intramolecular [2 + 2]-photocycloaddition reaction between one of the [small pi]-bonds of an allene and the CC double bond of a butenolide.
通过使用在
丙二烯的小π键之一与C1的CC双键之间的高度区域选择性的分子内[2 + 2]-光环加成反应作为关键步骤,制备了含有
环丁酮环的茄形针A的致密
三环亚结构。
丁烯内酯。