Post‐synthetic Rhodium (III) Complexes in Covalent Organic Frameworks for Photothermal Heterogeneous C−H Activation
作者:Teng Li、Pei‐Lin Zhang、Long‐Zhang Dong、Ya‐Qian Lan
DOI:10.1002/anie.202318180
日期:2024.4.2
this work, a general post-synthetic strategy for constructing bifunctional catalysts, Rh-COF, which connect photosensitive covalent organic frameworks and transition-metal catalytic groups through covalent bonding, was developed. Fascinatingly, such complexes enable efficient photothermal conversion properties, which can improve the photothermal catalytic performances in C−H activation to obtain excellent
Rhodium-Catalyzed Oxidative Cycloaddition of Benzamides and Alkynes via C−H/N−H Activation
作者:Todd K. Hyster、Tomislav Rovis
DOI:10.1021/ja103776u
日期:2010.8.4
The oxidative cycloaddition of benzamides and alkynes has been developed. The reaction utilizes Rh(III) catalysts in the presence of Cu(II) oxidants, and is proposed to proceed by N-H metalation of the amide followed by ortho C-H activation. The resultant rhodacycle undergoes alkyne insertion to form isoquinolones in good yield. The reaction is tolerant of extensive substitution on the amide, alkyne, and arene, including halides, silyl ethers, and unprotected aldehydes as substituents. Unsymmetrical alkynes proceed with excellent regioselectivity, and heteroaryl carboxamides are tolerated leading to intriguing scaffolds for medicinal chemistry. A series of competition experiments shed further light on the mechanism of the transformation and reasons for selectivity.