title: Mild and Efficient Palladium-Catalyzed Direct Trifluoroethylation of Aromatic Systems by C-H Activation.
abstract: The introduction of trifluoroalkyl groups into aromatic molecules is an important transformation in the field of organic and medicinal chemistry. However, the direct installation of fluoroalkyl groups onto aromatic molecules still represents a challenging and highly demanding synthetic task. Herein, a simple trifluoroethylation process that relies on the palladium-catalyzed C-H activation of aromatic compounds is described. With the utilization of a highly active trifluoroethyl(mesityl)iodonium salt, the developed catalytic method enables the first highly efficient and selective trifluoroethylation of aromatic compounds. The robust catalytic procedure provides the desired products in up to 95 % yield at 25 °C in 1.5 to 3 hours and tolerates a broad range of functional groups. The utilization of hypervalent reagents opens new synthetic possibilities for direct alkylations and fluoroalkylations in the field of transition-metal-catalyzed C-H activation.
authors.affiliation: MTA-ELTE "Lendület" Catalysis and Organic Synthesis Research Group, Institute of Chemistry, Eötvös University, Faculty of Science, Pázmány Péter stny. 1/A, H-1117, Budapest, Hungary.
authors.forename: Balázs L
authors.initials: BL
authors.lastname: Tóth
authors.affiliation: MTA-ELTE "Lendület" Catalysis and Organic Synthesis Research Group, Institute of Chemistry, Eötvös University, Faculty of Science, Pázmány Péter stny. 1/A, H-1117, Budapest, Hungary.
authors.forename: Szabolcs
authors.initials: S
authors.lastname: Kovács
authors.affiliation: MTA-ELTE "Lendület" Catalysis and Organic Synthesis Research Group, Institute of Chemistry, Eötvös University, Faculty of Science, Pázmány Péter stny. 1/A, H-1117, Budapest, Hungary.
authors.forename: Gergő
authors.initials: G
authors.lastname: Sályi
authors.affiliation: MTA-ELTE "Lendület" Catalysis and Organic Synthesis Research Group, Institute of Chemistry, Eötvös University, Faculty of Science, Pázmány Péter stny. 1/A, H-1117, Budapest, Hungary. novakz@elte.hu.
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Novák
keywords: C−H activation; anilides; iodonium salts; palladium; trifluoroethylation