straightforward synthesis of halogen‐containing quinolin‐2(1H)‐ones. The reaction proceeds without preactivation and directing groups through direct N–H and C–H bondactivation with a broad substrate scope and high efficiency. Halogen functional groups can be well tolerated here. Remarkably, this is the first example of an iridium‐catalyzed carbonylative C–H activation of anilines.
Ligand-Enabled Ni–Al Bimetallic Catalysis for Nonchelated Dual C–H Annulation of Arylformamides and Alkynes
作者:Yin-Xia Wang、Feng-Ping Zhang、Yu-Xin Luan、Mengchun Ye
DOI:10.1021/acs.orglett.0c00432
日期:2020.3.20
A bifunctional secondary phosphine oxide (SPO) ligand-controlled method was developed for Ni-Al-catalyzed nonchelated dual C-H annulation of arylformamides with alkynes, providing a series of substituted amide-containing heterocycles in <= 97% yield. The SPO-bound bimetallic catalysis proved to be critical to the reaction efficiency.
Nickel-Catalyzed Cycloaddition of<i>o</i>-Arylcarboxybenzonitriles and Alkynes via Cleavage of Two Carbon–Carbon σ Bonds
An intermolecular cycloaddition reaction has been developed, where o-arylcarboxybenzonitriles react with alkynes to afford coumarins in the presence of Ni(0)/P(CH(2)Ph)(3)/MAD as a catalyst. The reaction process displays an unusual mechanistic feature the cleavage of two independent C-CN and C-CO bonds.