Electrocyclic Ring Closure of the Enols of Vinyl Quinones. A <i>2H</i>-Chromene Synthesis
作者:Kathlyn A. Parker、Thomas L. Mindt
DOI:10.1021/ol0167199
日期:2001.11.1
Thermolysis of enolizable vinyl quinones in polar, aprotic media provides 2H-chromenes. Experimental evidence supports a two-step mechanism in which enolization is followed by a thermal 6pi-electrocyclic reaction of an intermediate quinone methide. Application of this method led to the total synthesis of the reputed structure of an Ageratum juvenile hormone. When enolizable vinyl quinones are the products
极性非质子介质中可烯化的乙烯基醌的热解可提供2H-色烯。实验证据支持两步机理,其中烯醇化之后是中间体醌甲基化物的热6π-电环反应。该方法的应用导致了香ger子幼体激素的已知结构的全合成。当可烯化的乙烯基醌是斯蒂勒偶联的产物时,可直接获得色烯环化产物。[反应:看文字]