Sosnovskikh, V. Ya.; Ovsyannikov, I. S.; Aleksandrova, I. A., Journal of Organic Chemistry USSR (English Translation), 1992, vol. 28, # 3.1, p. 420 - 426
Transformations of ?,?-difluorocarbonyl compounds. 4. Reaction of polyfluoro ketones with phenylhydrazine
作者:I. L. Knunyants、M. D. Bargamova、S. I. Pletnev
DOI:10.1007/bf00950584
日期:1980.8
Sosnovskikh, V. Ya., Russian Journal of Organic Chemistry, 1993, vol. 29, # 5.1, p. 740 - 744
作者:Sosnovskikh, V. Ya.
DOI:——
日期:——
KNUNYANTS I. L.; BARGAMOVA M. D.; PLETNEV S. I., IZV. AN CCCP CEP. XIM., 1980, HO 8, 1861-1865
作者:KNUNYANTS I. L.、 BARGAMOVA M. D.、 PLETNEV S. I.
DOI:——
日期:——
Sosnovskikh, V. Ya.; Ovsyannikov, I. S.; Aleksandrova, I. A., Journal of Organic Chemistry USSR (English Translation), 1992, vol. 28, # 3.1, p. 420 - 426
作者:Sosnovskikh, V. Ya.、Ovsyannikov, I. S.、Aleksandrova, I. A.
DOI:——
日期:——
Controllable catalytic difluorocarbene transfer enables access to diversified fluoroalkylated arenes
Difluorocarbene has important applications in pharmaceuticals, agrochemicals and materials, but all these applications proceed using just a few types of reaction by taking advantage of its intrinsic electrophilicity. Here, we report a palladium-catalysed strategy that confers the formed palladium difluorocarbene (Pd=CF2) species with both nucleophilicity and electrophilicity by switching the valence state of the palladium centre (Pd(0) and Pd(ii), respectively). Controllable catalytic difluorocarbene transfer occurs between readily available arylboronic acids and the difluorocarbene precursor diethyl bromodifluoromethylphosphonate (BrCF2PO(OEt)2). From just this simple fluorine source, difluorocarbene transfer enables access to four types of product: difluoromethylated and tetrafluoroethylated arenes and their corresponding fluoroalkylated ketones. The transfer can also be applied to the modification of pharmaceuticals and agrochemicals as well as the one-pot diversified synthesis of fluorinated compounds. Mechanistic and computational studies consistently reveal that competition between nucleophilic and electrophilic palladium difluorocarbene ([Pd]=CF2) is the key factor controlling the catalytic difluorocarbene transfer. Difluorocarbene transfer is mostly limited to reactions that utilize its intrinsic electrophilicity. Now, a controllable palladium-catalysed difluorocarbene transfer reaction is reported that involves nucleophilic and electrophilic palladium difluorocarbene species. The selective reactions between arylboronic acids and the difluorocarbene precursor BrCF2PO(OEt)2 give four different productsâdifluoromethylated and tetrafluoroethylated arenes and their corresponding fluoroalkylated ketones.