One-Pot Synthesis of Diarylmethylidenefluorenes and Phenanthrenes by Palladium-Catalyzed Multiple CH Bond Functionalization
作者:Vedhagiri S. Thirunavukkarasu、Kanniyappan Parthasarathy、Chien-Hong Cheng
DOI:10.1002/chem.200902726
日期:2010.2.1
A palladium‐catalyzed rapid synthesis of diarylmethylidenefluorenes and phenanthrenes by multiple CH bond activation, CC bond formation, and Heck‐type cyclization is described (see scheme).
Rhodium(III)-Catalyzed Amidation of Aryl Ketone<i>O</i>-Methyl Oximes with Isocyanates by CH Activation: Convergent Synthesis of 3-Methyleneisoindolin-1-ones
作者:Bing Zhou、Wei Hou、Yaxi Yang、Yuanchao Li
DOI:10.1002/chem.201204448
日期:2013.4.8
Going green! The rhodium(III)‐catalyzed annulation of arylketone O‐methyl oximes with isocyanates for the synthesis of 3‐methyleneisoindolin‐1‐ones is reported (see scheme). This reaction exhibits high regioselectivity, functional‐group tolerance, and broad substrate scope, without the use of additives or production of environmentally hazardous waste.
Advancing <i>Meta</i>-Selective C–H Amination through Non-Covalent Interactions
作者:Qianqian Lv、Zongxing Hu、Yousong Zhang、Zhihan Zhang、Honghui Lei
DOI:10.1021/jacs.3c09904
日期:2024.1.24
Regioselective C–H amination of simple arenes is highly desirable, but accessing meta-sites of ubiquitous arenes has proven challenging due to the lack of both electronic and spatial preference. This study demonstrates the successful use of various privileged nitrogen-containing functionalities found in pharmaceutical compounds to direct meta-C–H amination of arenes, overcoming the long-standing requirement
Direct Oxygenation of C–H Bonds through Photoredox and Palladium Catalysis
作者:Sk. Sheriff Shah、Maniklal Shee、Amit Kumar Singh、Amrita Paul、N. D. Pradeep Singh
DOI:10.1021/acs.joc.9b03197
日期:2020.3.6
This report presents the oxygenation of C-H bonds via the merger of photocatalysis and Pd catalysis. Herein, we describe the utilization of a photocatalyst to oxidize an organopalladium(II) intermediate to high-valent PdIII or PdIV intermediates, which promotes the formation of C-O bonds. The demonstrated method works efficiently with various directing groups, such as oxime ether and benzothiazole
A removable oxime-assisted meta-C–H nitration of arenes is reported. Mechanistic investigations and DFT calculations reveal a new monomeric octahedral ruthenium(II) complex is responsible for the meta-selective nitration. Dioxygen as a cooxidant is crucial for achieving high conversion and good yields. Moreover, the utility of the present reaction protocol is further showcased by the late-stage modification