A tandem bromonium ion-promoted cyclization of two pendant hydroxyl groups onto a central furan core provides a highly direct route to both the [5,5,5]- and the [6,5,6]-trioxadispiroketal ring systems.
串联
溴离子促进的两个侧基羟基在环
呋喃核上的环化为[5,5,5]-和[6,5,6]-三恶二螺酮基环系统提供了一条非常直接的途径。