Combining Transition Metal Catalysis with Radical Chemistry: Dramatic Acceleration of Palladium-Catalyzed CH Arylation with Diaryliodonium Salts
作者:Sharon R. Neufeldt、Melanie S. Sanford
DOI:10.1002/adsc.201200738
日期:2012.12.14
This paper describes a photoredox palladium/iridium-catalyzed C-H arylation with diaryliodonium reagents. Details of the reaction optimization, substrate scope, and mechanism are presented along with a comparison to a related method in which aryldiazonium salts are used in place of diaryliodonium reagents. The unprecedentedly mild reaction conditions (25 masculineC in methanol), the requirement for
Room-Temperature C–H Arylation: Merger of Pd-Catalyzed C–H Functionalization and Visible-Light Photocatalysis
作者:Dipannita Kalyani、Kate B. McMurtrey、Sharon R. Neufeldt、Melanie S. Sanford
DOI:10.1021/ja208068w
日期:2011.11.23
This communication describes the development of a room-temperature ligand-directed C-H arylation reaction using aryldiazoniumsalts. This was achieved by the successful merger of palladium-catalyzed C-H functionalization and visible-lightphotoredoxcatalysis. The new method is general for a variety of directing groups and tolerates many common functional groups.
Iridium(<scp>iii</scp>)-catalyzed regioselective direct arylation of sp<sup>2</sup> C–H bonds with diaryliodonium salts
作者:Pan Gao、Li Liu、Zhuangzhi Shi、Yu Yuan
DOI:10.1039/c6ob01145d
日期:——
A regioselectivedirectarylation of arenes and olefins at the ortho position is reported. The key to the high selectivity is the appropriate choice of diaryliodonium salts as the arylating reagent in the presence of a cationic iridium(III) catalyst. The coordination of the metal with an oxygen atom or a nitrogen atom and subsequent C–H activation allows for directarylation with coupling partners
Helical Carbenium Ion: A Versatile Organic Photoredox Catalyst for Red-Light-Mediated Reactions
作者:Liangyong Mei、José M. Veleta、Thomas L. Gianetti
DOI:10.1021/jacs.0c05507
日期:2020.7.15
m (nPr-DMQA+) tetrafluoroborate) has been used as an organic photoredox catalyst for photoreductions and photooxidations in the presence of red light (λmax = 640 nm). It has catalyzed red-light-mediated dual transition-metal/photoredox-catalyzed C-H arylation and intermolecular atom transfer radical addition through oxidative quenching. Moreover, its potential in photooxidation catalysis has also been
Pd-Catalyzed ortho-Arylation of N-Aryloxazolidinones with Simple Arenes Using Sodium Persulfate
作者:Vy Dong、Charles Yeung
DOI:10.1055/s-0030-1259731
日期:2011.4
We report a Pd-catalyzed ortho-arylation of N-aryloxazolidinones under mild conditions. Our oxidative cross-coupling consumes sodium persulfate (Na2S2O8), a green and environmentally benign reagent, as the terminal oxidant. Trifluoroacetic acid (TFA) is critical for reactivity.