Lithiation of 2-(chloroaryl)-2-aryl-1,3-dioxolanes with butyllithium activated by N,N,N′,N″,N″-pentamethyldiethylenetriamine
作者:Márta Porcs-Makkay、Anna Komáromi、Gyula Lukács、Gyula Simig
DOI:10.1016/j.tet.2007.08.086
日期:2008.2
substituted phenyl rings of benzophenone ketals in lithiation reactions proved to be a useful tool to study both ortho-directing ability and long-range effects of the substituents. The regioselectivities observed in the reaction of benzophenone ketals having one or two chloro substituents in one of the aryl rings with butyllithium complexed to N,N,N′,N″,N″-pentamethyldiethylenetriamine demonstrate the
在锂化反应中二苯甲酮缩酮的各种取代的苯环的分子内竞争被证明是研究邻位导向能力和取代基的远距离作用的有用工具。在具有在与丁基锂的芳基环络合到一一个或两个取代基氯二苯甲酮缩酮的反应中观察到的区域选择性Ñ,Ñ,Ñ ',Ñ “,Ñ ” -五甲基表明两者的意义邻-和间位-acidifying氯取代基的作用。如此产生的硫代化合物被羧化,产生新的多取代的苯甲酸。