The Superbase-Mediated Pairwise Substitution of the 2,2′- and 6,6′-Positions in a Biphenyl Derivative
作者:Manfred Schlosser、Guiseppe Mangano、Frédéric Leroux
DOI:10.1002/ejoc.200300630
日期:2004.3
The superbasic mixt. of butyllithium and potassium tert-butoxide is powerful enough to enable the double proton abstraction from one ortho and one ortho' position of 4,4'-di-tert-butylbiphenyl. In this way, a series of functionalized derivs. becomes readily accessible, among them 4,4'-di-tert-butylbiphenyldiyl-2,2'-dicarboxylic acid and 4,4'-di-tert-butylbiphenyl-2,2'-diol. The latter compd. can be
超基础的混合物。丁基锂和叔丁醇钾的反应能力足以从 4,4'-二叔丁基联苯的一个邻位和一个邻位上提取双质子。这样,一系列功能化的衍生物。变得容易获得,其中包括 4,4'-二叔丁基联苯二基-2,2'-二羧酸和 4,4'-二叔丁基联苯-2,2'-二醇。后者compd。可以再次进行超碱促进的双金属化,从而产生 2,2',6,6'-四取代的联苯衍生物。[在 SciFinder (R) 上]