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
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
Development of fluorination methods using continuous-flow microreactors
作者:Marcus Baumann、Ian R. Baxendale、Laetitia J. Martin、Steven V. Ley
DOI:10.1016/j.tet.2009.05.083
日期:2009.8
The safe and reliable use of various fluorination methods including nucleophilic fluorination (DAST), trifluoromethylation (Ruppert's reagent) and electrophilic fluorination (Selectfluor®) in a continuous-flow microreactor is reported. Special attention was given to the use of in-line scavenging procedures in order to obtain clean products without the need for further purification.
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;