作者:Thomas Boddaert、Yoann Coquerel、Jean Rodriguez
DOI:10.1002/chem.201002538
日期:2011.2.11
A study of the organocatalytic activity of N‐heterocyclic carbenes (NHCs) in the Michael addition of 1,3‐dicarbonyl compounds has allowed us to identify 1,3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene (IPr) as an excellent catalyst for this transformation (up to 99 % yield with a 2.5 mol % catalyst loading), and the reaction was found to be of broad scope. Two early applications of this unprecedented
对N-杂环卡宾(NHCs)在1,3-二羰基化合物的迈克尔加成反应中的有机催化活性的研究使我们能够鉴定出1,3-双(2,6-二异丙基苯基)咪唑-2-亚烷基(IPr)作为用于该转化的极好的催化剂(在2.5mol%的催化剂负载下产率高达99%),发现该反应具有广泛的范围。描述了这种NHC前所未有的催化活性的两个早期应用,即简单的环状1,3-二羰基和丙二酸衍生物的多米诺碳环化反应,它们允许立体选择进入桥接的双环化合物,以及立体选择性合成环己醇(或环己烯)。还报道了早期的机械研究。