Asymmetric Organocatalytic Benzylation of α,β-Unsaturated Aldehydes with Toluenes
作者:Luca Dell'Amico、Xavier Companyó、Tricia Naicker、Thomas M. Bräuer、Karl Anker Jørgensen
DOI:10.1002/ejoc.201300899
日期:2013.8
direct organocatalytic enantioselective benzylation by using toluenes and α,β-unsaturated aldehydes is presented. The reaction is catalyzed by tert-butyldimethylsilyl-protected diphenylprolinol in the presence of a mild organic base and proceeds with excellent yields and enantioselectivities up to >99 % ee. This reactivity is based on a synergistic effect between the iminium ion intermediate and the
介绍了使用甲苯和 α,β-不饱和醛的直接有机催化对映选择性苄基化反应。该反应在温和有机碱存在下由叔丁基二甲基甲硅烷基保护的二苯基脯氨醇催化,并以优异的产率和对映选择性高达 > 99 % ee。这种反应性基于亚胺离子中间体和碱活化甲苯之间的协同效应。具有各种吸电子取代基的甲苯衍生物也应用于这种前所未有的转化。合成潜力通过对产品的操作来证明,例如,具有生物活性的苯基苯并氮杂。