Attempted Synthesis of Spongidines by a Radical Cascade Terminating onto a Pyridine Ring
作者:Miguel A. González、Sonia Molina-Navarro
DOI:10.1021/jo0712401
日期:2007.9.1
Mn(III)-basedoxidativefree-radicalcyclization of an unsaturated β-keto ester containing a pyridine ring as radical trap has been studied. This intramolecular reaction of nucleophilic carbon-centered radicals with the pyridine ring leads to the stereospecific construction of a tetracyclic compound in which five chiral centers are created in one pot. This synthetic approach represents the first attempt