Article ID Journal Published Year Pages File Type
1313479 Journal of Fluorine Chemistry 2016 7 Pages PDF
Abstract

•1,1-Difluoroethylation and 2,2,2-trifluoroethylation of ArMgBr proceeded smoothly.•Co/diamine-catalyst showed the satisfactory activity in this reaction.•The choice of diamine ligand and solvent are very important for excellent yields.

Cobalt/diamine-catalyzed 1,1-difluoroethylation and 2,2,2-trifluoroethylation of aryl Grignard reagents with 1,1-difluoroethyl and 2,2,2-trifluoroethyl halides were investigated. With regard to the 1,1-difluoroethylation, 1,2-bis(dimethylamino)-2-methylpropane, which has been rarely used in the cross-coupling reactions, gave the highest yield among the diamine ligands tested. In the 2,2,2-trifluoroethylation, trans-1,2-bis(dimethylamino)cyclohexane provided the desired products in satisfactory yields with not only 2,2,2-trifluoroethyl iodide but also chloride. This Co/diamine catalyst was also effective for the coupling with other partially fluorinated alkyl halides in the presence of appropriate diamine ligands.

Graphical abstractThe combined use of Co/diamine catalyzed 1,1-difluoroethylation and 2,2,2-trifluoroethylation of aryl Grignard reagents with 1,1-difluoroethyl and 2,2,2-trifluoroethyl halides, providing the desired products in satisfactory yields.Figure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemistry Inorganic Chemistry
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