A thermal methodology for the expeditious preparation of structurally novel strained tricyclic β-lactams containing a cyclobutene ring has been developed. Besides, the first examples accounting for the intramolecular double [2+2] cycloaddition of bis(allenyne)s have been achieved through thermolysis of C 2 -symmetric or unsymmetric bis(β-lactam-allenyne)s, which have been prepared by copper-promoted
已经开发了一种快速制备含有环丁烯环的结构新颖的应变三环 β-内酰胺的热方法。此外,通过 C 2 对称或不对称双(β-内酰胺-丙炔)的热解,已经实现了双(丙炔)的分子内双 [2+2] 环加成的第一个例子,其已由铜制备- 促进炔烃均或交叉偶联反应。带有中心七元环的双(三环)环结构来自炔烃与丙二烯的远端键的区域选择性环化,最有可能是通过自由基中间体。