Iron‐Catalyzed Fluoroalkylation of Arylborates with Sulfone Reagents: Beyond the Limitation of Reduction Potential
作者:Zhiqiang Wei、Wenjun Miao、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.202102597
日期:2021.6.7
alkyl–aryl coupling reaction between sulfones and arylboron compounds has remained a challenge. We report the first iron-catalyzed radical difluoroalkylation of arylborates with N-heteroaryl sulfones. The coordination between the iron catalyst and the nitrogen atom of N-heteroaryl sulfones was identified to be important in overcoming the reductionpotentiallimitation of sulfones in the intermolecular single-electron-transfer
Nickel-Catalyzed Aromatic Cross-Coupling Difluoromethylation of Grignard Reagents with Difluoroiodomethane
作者:Hirotaka Motohashi、Koichi Mikami
DOI:10.1021/acs.orglett.8b02264
日期:2018.9.7
The nickel-catalyzed cross-coupling difluoromethylation of the Grignardreagents with difluoroiodomethane is shown to provide the corresponding aromatic difluoromethyl products in excellent to moderate yields. The difluoromethylation proceeds smoothly within 1 h at room temperature with 1.5 equiv of the Grignardreagents in the presence of Ni(cod)2/TMEDA (2.5–0.5 mol %). Mechanistic studies clarify
Electrochemical-Promoted Nickel-Catalyzed Oxidative Fluoroalkylation of Aryl Iodides
作者:Zhenlei Zou、Heyin Li、Mengjun Huang、Weigang Zhang、Sanjun Zhi、Yi Wang、Yi Pan
DOI:10.1021/acs.orglett.1c02997
日期:2021.11.5
This work describes a general strategy for metal-catalyzed cross-coupling of fluoroalkyl radicals with aryl halides under electrochemical conditions. The contradiction between anodic oxidation of fluoroalkyl sulfinates and cathodic reduction of low-valentnickel catalysts can be well addressed by paired electrolysis, allowing for direct introduction of fluorinated functionalities into aromatic systems
Ligand-Less Iron-Catalyzed Aromatic Cross-Coupling Difluoromethylation of Grignard Reagents with Difluoroiodomethane
作者:Hirotaka Motohashi、Miki Kato、Koichi Mikami
DOI:10.1021/acs.joc.9b00585
日期:2019.5.17
Iron-catalyzed cross-coupling difluoromethylations of the Grignardreagents with difluoroiodomethane provide various aromatic difluoromethyl products in good yields, not employing sterically demanding ligands. Difluoromethylations proceed within 30 min at −20 °C with 2.0 equiv of the Grignardreagents and FeCl3 or Fe(acac)3 (2.5 mol %). Mechanistic investigations clarify difluoromethyl radical intervention;
Access to Difluoromethylated Arenes by Pd-Catalyzed Reaction of Arylboronic Acids with Bromodifluoroacetate
作者:Zhang Feng、Qiao-Qiao Min、Xingang Zhang
DOI:10.1021/acs.orglett.5b03206
日期:2016.1.4
of aryl boronic acids with bromodifluoroacetate is described. The reaction proceeds under mild reaction conditions with hydroquinone and Fe(acac)3 as additives. Preliminary mechanistic studies reveal that a difluorocarbene pathway is involved in the reaction, which is unusual compared to the most traditional approaches. This reaction has advantages of high efficiency and excellent functional group compatibility