Pd/C-Catalyzed Cyclizative Cross-Coupling of Two<i>ortho</i>-Alkynylanilines under Aerobic Conditions: Synthesis of 2,3′-Bisindoles
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201501020
日期:2015.5.11
A palladium‐catalyzed cyclizative cross‐coupling of two o‐alkynylanilines to 2,3′‐bisindoles under aerobic oxidative conditions was developed. Mechanistic studies suggested that the two catalytic cycles, namely the formation of 3‐alkynylindoles 8 and their subsequent cyclization to bisindoles 5, are temporally separated. The aminopalladation of 3‐alkynylindoles 8 occurred only after all the N,N‐di
在好氧氧化条件下,开发了钯催化的两个邻炔基苯胺与2,3'-双吲哚的环化交叉偶联反应。机理研究表明,这两个催化循环在时间上是分开的,即3-炔基吲哚8的形成及其随后的环化成双吲哚5。仅在消耗完所有N,N-二烷基邻炔基苯胺后,才发生3-炔基吲哚8的氨基palpalpalation 。固体支持物(活性炭)在第二个分子内氨基触pal过程中起着至关重要的作用。