Preparation of Mono-/Difluorinated Hydrocarbon Compounds
申请人:Saint-Jalmes Laurent
公开号:US20090234151A1
公开(公告)日:2009-09-17
Mono- or difluorinated hydrocarbon compounds are prepared from an alcohol or a carbonylated compound by reacting one of these with a fluorinating reagent, optionally in the presence of a base, the fluorinating agent comprising a pyridinium reactant having the following formula (F), wherein R
0
is an alkyl or cycloalkyl radical:
Pd-Catalyzed α-Arylation of α,α-Difluoroketones with Aryl Bromides and Chlorides. A Route to Difluoromethylarenes
作者:Shaozhong Ge、Wojciech Chaładaj、John F. Hartwig
DOI:10.1021/ja501117v
日期:2014.3.19
α-difluoroketones with aryl and heteroaryl bromides and chlorides catalyzed by an air- and moisture-stable palladacyclic complex containing P(t-Bu)Cy2 as ligand. The combination of this Pd-catalyzed arylation and base-induced cleavage of the acyl–aryl C–C bond within the α-aryl-α,α-difluoroketone constitutes a one-pot, two-step procedure to synthesize difluoromethylarenes from aryl halides. A broad range
Iron-Catalyzed Difluoromethylation of Arylzincs with Difluoromethyl 2-Pyridyl Sulfone
作者:Wenjun Miao、Yanchuan Zhao、Chuanfa Ni、Bing Gao、Wei Zhang、Jinbo Hu
DOI:10.1021/jacs.7b11976
日期:2018.1.24
We report the first iron-catalyzed difluoromethylation of arylzincs with difluoromethyl2-pyridylsulfone via selective C-S bond cleavage. This method employs the readily available, bench-stable fluoroalkyl sulfone reagent and inexpensive iron catalyst, allowing facile access to structurally diverse difluoromethylated arenes at low temperatures. The experiment employing a radical clock indicates the
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