Copper(II)-Catalyzed Domino Synthesis of Indolo[3,2-<i>c</i>]quinolinones via Selective Carbonyl Migration
作者:Dhanarajan Arunprasath、Govindasamy Sekar
DOI:10.1021/acs.orglett.8b03557
日期:2019.2.15
A Cu(II)-catalyzed domino process involving the carbene N–H insertion, intramolecular aldol-type trapping and unprecedented ring-expansion of oxindole core through C3-selective 1,2-carbonyl migration is described for the synthesis of indolo[3,2-c]quinolinones. This tetracyclic core, having an all-carbon quaternary center, was efficiently synthesized in high yields from amines and 3-diazo-oxindoles
描述了吲哚合成的Cu(II)催化的多米诺过程,该过程涉及卡宾N–H插入,分子内醛醇型捕获和通过C3选择性1,2-羰基迁移引起的羟吲哚核的空前扩环[3, 2- c ]喹啉酮。该四环核具有全碳的季中心,可以高效率地由胺和3-重氮-氧吲哚合成。机理研究表明,该反应是通过逐步途径进行的,并且路易斯酸铜与原位形成的TfOH痕迹的隐含布朗斯台德酸度之间具有协同催化作用。