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)-based oxidative free-radical cyclization 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
研究了含吡啶环作为自由基陷阱的不饱和β-酮酯的Mn(III)基氧化自由基环化反应。亲核碳中心自由基与吡啶环的这种分子内反应导致四环化合物的立体有规结构,其中在一个罐中形成五个手性中心。这种合成方法代表了制备抗炎吡啶鎓生物碱海绵体A,B和D的首次尝试。