Formation of reactive o-quinone methides from the reaction of trimethylsilyl(methyl)-substituted 1,4-benzoquinones with nucleophiles
作者:John E. Ezcurra、Kostas Karabelas、Harold W. Moore
DOI:10.1016/j.tet.2004.09.052
日期:2005.1
o-Quinone methides are formed from the reaction of nucleophiles with trimethylsilyl(methyl)-1,4-benzoquinones. These reactive intermediates are trapped by excess nucleophile to form substituted quinones following oxidation. In addition, varying amounts of a symmetrical dimer and a xanthen derivative were observed. The influence of different nucleophiles and ring substituents on the rate of reaction
邻醌甲基化物是由亲核试剂与三甲基甲硅烷基(甲基)-1,4-苯醌反应形成的。这些反应性中间体被过量的亲核试剂捕获,在氧化后形成取代的醌。另外,观察到变化量的对称二聚体和a吨衍生物。已经研究了不同亲核试剂和环取代基对反应速率的影响,并且与由亲核试剂攻击甲硅烷基基团引发的乙烯基烯醇化物的限速形成相一致。