N-Heterocyclic Carbene Catalyzed Umpolung of Styrenes: Mechanistic Elucidation and Selective Tail-to-Tail Dimerization
作者:Michael Schedler、Nathalie E. Wurz、Constantin G. Daniliuc、Frank Glorius
DOI:10.1021/ol501256d
日期:2014.6.6
N-heterocyclic carbenes (NHCs) and styrenes yields alkyl-substituted azolium salts, which are able to form nucleophilic deoxy Breslow intermediates by simple deprotonation. This hitherto unknown reaction of NHCs represents a new way to generate deoxy Breslow intermediates and paves the way for the selective NHC-catalyzed tail-to-tail homodimerization of styrenes. This reaction significantly broadens
N杂环卡宾(NHC)与苯乙烯之间的反应产生烷基取代的盐,该盐能够通过简单的去质子化反应形成亲核脱氧Breslow中间体。NHC的这种迄今未知的反应代表了一种生成脱氧Breslow中间体的新方法,为选择性NHC催化的苯乙烯的尾到尾均二聚化铺平了道路。该反应显着拓宽了Michael umpolung的范围,并提供了一种生成1,4-二芳基化合物的新方法。