Rhodium(III) catalysis has enabled a plethora of oxidative C−H functionalizations, which predominantly employ stoichiometric amounts of toxic and/or expensive metal oxidants. In contrast, we herein describe the first electrochemical rhodium‐catalyzedC−Hactivation that avoids hazardous chemical oxidants. Environmentally benign twofold C−H/C−H functionalizations were accomplished with weakly coordinating
Enhancing Ru(II)‐Catalysis with Visible‐Light‐Mediated Dye‐Sensitized TiO
<sub>2</sub>
Photocatalysis for Oxidative C−H Olefination of Arene Carboxylic Acids at Room Temperature
作者:Suman Dana、Purusattam Dey、Siddappa A. Patil、Mahiuddin Baidya
DOI:10.1002/asia.201901718
日期:2020.3.2
Erythrosine B sensitized TiO2 photocatalysis has been combined with Ru(II)-catalysis to accomplish an oxidativeolefination/annulation of benzoic acids with activated olefins under mild conditions that tolerates useful functionalities, such as halides, free hydroxy, acetamido, etc. The morphology of the photocatalyst is unaffected during the reaction and it can be reused. Mechanistic studies favor
One-Pot Sequential N-Heterocyclic Carbene/Rhodium(III) Catalysis: Synthesis of Fused Polycyclic Isocoumarins
作者:So Won Youn、Huen Ji Yoo
DOI:10.1002/adsc.201700072
日期:2017.7.3
A one‐pot sequential N‐heterocyclic carbene–rhodium (NHC‐Rh) catalysis is described, demonstrating the compatibility of NHC and Rh catalysts. N‐Heterocyclic carbene‐catalyzedaerobicoxidation of benzaldehydes and subsequent rhodium(III)‐catalyzedoxidative coupling/annulation with multiple bonds enabled the formation of two C–O bonds and one C–C bond in a single pot. This operationally easy, one‐pot
Synthesis of Phthalides through Tandem Rhodium-Catalyzed C-H Olefination and Annulation of Benzamides
作者:Neeraj Kumar Mishra、Jihye Park、Miji Choi、Satyasheel Sharma、Hyeim Jo、Taejoo Jeong、Sangil Han、Saegun Kim、In Su Kim
DOI:10.1002/ejoc.201600368
日期:2016.6
The rhodium(III)-catalyzed tandem C–H olefination and cyclization of benzamides with various alkenes is described. This protocol provides direct access to highly substituted phthalides, which are known as crucial frameworks of biologically active compounds. In particular, the amide directing group containing a benzimidazole group facilitates the activation of aromatic ortho-C–H bonds leading to olefination
Ruthenium(<scp>ii</scp>) oxidase catalysis for C–H alkenylations in biomass-derived γ-valerolactone
作者:Alexander Bechtoldt、Marcel E. Baumert、Luigi Vaccaro、Lutz Ackermann
DOI:10.1039/c7gc03353b
日期:——
Ruthenium(II) biscarboxylate oxidasecatalysis is a powerful tool for the assembly of functionalized arenes with oxygen as a green oxidant, but this strategy was thus far limited to its use in traditional organic solvents. Herein, we report on a green procedure for the ruthenium(II) biscarboxylate-catalysed C–H functionalisation in biomass-derived γ-valerolactone as the reaction medium. The oxidase