Cyclization of Bicyclic Diterpenes Promoted by SmI2. Synthesis of Tri- and Tetracyclic Diterpenes
作者:Isidro S. Marcos、Rosalina F. Moro、Santiago Carballares M.、Julio G. Urones
DOI:10.1055/s-2002-20465
日期:——
The synthesis of 15-hibaen-14-one (a tetracyclicditerpene) is described from zamoranic acid as starting material in an excellent yield and with total control of the stereochemistry. The key step is a SmI 2 promoted pinacol cyclization.
Several tri- and tetracyclicditerpenes have been synthesised from zamoranic acid. The key step is the cyclisation of a dicarbonyl 13,14-secoderivative by SmI2.