Nitroarenes as the Nitrogen Source in Intermolecular Palladium‐Catalyzed Aryl C–H Bond Aminocarbonylation Reactions
作者:Fei Zhou、Duo‐Sheng Wang、Xinyu Guan、Tom G. Driver
DOI:10.1002/anie.201612324
日期:2017.4.10
aminocarbonylation of aryl and heteroaryl sp2 C−H bonds using nitroarenes as the nitrogen source was achieved using Mo(CO)6 as the reductant and origin of the CO. This intermolecular C−H bond functionalization does not requires any exogenous ligand to be added, and our mechanism experiments indicate that the palladacycle catalyst serves two roles in the aminocarbonylation reaction: reduce the nitroarene
Ruthenium-Catalyzed<i>meta</i>-Selective C−H Mono- and Difluoromethylation of Arenes through<i>ortho</i>-Metalation Strategy
作者:Zhong-Yuan Li、Liang Li、Qi-Li Li、Kun Jing、Hui Xu、Guan-Wu Wang
DOI:10.1002/chem.201700354
日期:2017.3.8
Mechanistic studies indicate that a reaction pathway involving palladium‐initiated radical species is involved in the catalytic cycle. The new dual catalytic system consisting of compatible ruthenium(II) and palladium(0) complexes enables the key processes of C−H activation and mono‐/difluoromethyl‐radical formation to occur and achieves the meta‐selective functionalization efficiently. In addition, the present
Traceless Chelation-Controlled Rhodium-Catalyzed Intermolecular Alkene and Alkyne Hydroacylation
作者:Joel F. Hooper、Rowan D. Young、Andrew S. Weller、Michael C. Willis
DOI:10.1002/chem.201204056
日期:2013.2.25
A new functional‐group tolerant, rhodium‐catalyzed, sulfide‐reduction process is combined with rhodium‐catalyzed chelation‐controlled hydroacylation reactions to give a traceless hydroacylation protocol. Aryl‐ and alkenyl aldehydes can be combined with both alkenes, alkynes and allenes to give traceless products in high yields. A preliminary mechanistic proposal is also presented.
Palladium‐catalyzed trifluoromethylthiolation of chelation‐assisted C–Hbonds has been accomplished by employing a readily accessible electrophilic trifluoromethylthiolating reagent.
Direct Decarboxylative<i>Meta</i>-Selective Acylation of Arenes via an<i>Ortho</i>-Ruthenation Strategy
作者:Kun Jing、Zhong-Yuan Li、Guan-Wu Wang
DOI:10.1021/acscatal.8b03695
日期:2018.12.7
using Ru3(CO)12 as the catalyst and α-oxocarboxylic acids as the acylation source, featured broad substrate scope, good functional group tolerance, and high regioselectivity. Mechanistic studies demonstrated that a radical process and an 18e-octahedral ruthenium species were involved in this reaction. The present work provides a new strategy for the regioselective meta-acylation reactions and will