作者:George Majetich、Yong Zhang、Xinrong Tian、Jonathan E. Britton、Yang Li、Ryan Phillips
DOI:10.1016/j.tet.2011.09.072
日期:2011.12
A biomimetic synthesis of the triterpene (±)-perovskone was achieved featuring a remarkable polycyclization process in which three rings, four bonds, and five stereocenters were created in a single operation in 82% yield. This convergent synthesis required 16 steps, starting from vanillin, and proceeded in 9% overall yield. A second route to prepare optically active quinone 2 took 15 steps in 36% overall
实现了三萜(±)-perovskone的仿生合成,该合成具有显着的多环化过程,其中在一次操作中以82%的产率生成了三个环,四个键和五个立体中心。从香兰素开始,这种收敛的合成需要16个步骤,总产率为9%。制备旋光性醌2的第二种方法以15%的步骤进行,总收率为36%,并且具有钯催化的还原性烯丙基转座,可立体确定C-5手性。醌(-)- 2通过多环化级联转化为(+)-perovskone(1),该级联在一次操作中以50%的收率形成了四个环,五个键和六个立体中心。