作者:Atanu Patra、Subrata Mukherjee、Tamal Kanti Das、Shailja Jain、Rajesh G. Gonnade、Akkattu T. Biju
DOI:10.1002/anie.201611268
日期:2017.3.1
N‐Heterocyclic carbene (NHC) catalysis has been widely used for the umpolung of aldehydes, and recently for the umpolung of Michael acceptors. Described herein is the umpolung of aldimines catalyzed by NHCs, and the reaction likely proceeds via aza‐Breslow intermediates. The NHC‐catalyzed intramolecular cyclization of aldimines bearing a Michael acceptor resulted in the formation of biologically important
N-杂环卡宾(NHC)催化已广泛用于醛的缩酮,最近还用于Michael受体的缩酮。本文描述的是NHC催化的醛亚胺的反应,反应可能通过aza-Breslow中间体进行。NHC催化带有Michael受体的醛亚胺的分子内环化反应,以中等至良好的产率形成了生物学上重要的2-(杂)芳基吲哚3-乙酸衍生物。发现由双环三唑鎓盐产生的卡宾对于这种转化是有效的。