作者:Christian Fischer、Sean W. Smith、David A. Powell、Gregory C. Fu
DOI:10.1021/ja058222q
日期:2006.2.1
N-Heterocyclic carbenes can catalyze beta-alkylations of a range of alpha,beta-unsaturated esters, amides, and nitriles that bear pendant leaving groups to form a variety of ring sizes. In this process, the nucleophilic catalyst transiently transforms the normally electrophilic beta carbon into a nucleophilic site through an unanticipated addition-tautomerization sequence.
N-杂环卡宾可以催化一系列带有离去基团的α、β-不饱和酯、酰胺和腈的β-烷基化反应,形成各种大小的环。在这个过程中,亲核催化剂通过意想不到的加成-互变异构序列将正常亲电的β碳瞬间转变为亲核位点。