<i>cis</i>-Specific Hydrofluorination of Alkenylarenes under Palladium Catalysis through an Ionic Pathway
作者:Enrico Emer、Lukas Pfeifer、John M. Brown、Véronique Gouverneur
DOI:10.1002/anie.201310056
日期:2014.4.14
paper describes the hydrofluorination of alkenes through sequential H− and F+ addition underpalladiumcatalysis. The reaction is cis specific, thus providing access to benzylic fluorides. The mechanism of this reaction involves an ionicpathway and is distinct from known hydrofluorinations involving radical intermediates. The first catalytic enantioselective hydrofluorination is also disclosed.
the direct conversion of benzylicC-H groups to C-F. We show that visible light can activate diarylketones to abstract a benzylic hydrogen atom selectively. Adding a fluorine radical donor yields the benzylicfluoride and regenerates the catalyst. The selective formation of mono- and difluorination products can be achieved by catalyst control. 9-Fluorenone catalyzes benzylicC-H monofluorination, while
Desulfurative fluorination using nitrosonium tetrafluoroborate and pyridinium poly(hydrogen fluoride)
作者:Chentao York、G.K. Surya Prakash、George A. Olah
DOI:10.1016/0040-4020(95)00864-5
日期:1996.1
Nitrosoniumtetrafluoroborate in conjunction with pyridiniumpoly(hydrogenfluoride) has been found to be excellent desulfurativefluorination reagent. In NO+BF4−/PPHF system, mono-fluorides and gem-difluordes have been obtained in high yields from the corresponding phenylsulfides and dithiolane derivatives, respectively.
Insertion of Diazo Esters into C–F Bonds toward Diastereoselective One-Carbon Elongation of Benzylic Fluorides: Unprecedented BF<sub>3</sub> Catalysis with C–F Bond Cleavage and Re-formation
作者:Fei Wang、Yoshihiro Nishimoto、Makoto Yasuda
DOI:10.1021/jacs.1c10517
日期:2021.12.15
Selective transformation of C–F bonds remains a significant goal in organic chemistry, but C–F insertion of a one-carbon-atom unit has never been established. Herein we report the BF3-catalyzed formal insertion of diazo esters as one-carbon-atom sources into C–F bonds to accomplish one-carbon elongation of benzylic fluorides. A DFT calculation study revealed that the BF3 catalyst could contribute to
Methods of C—H bond fluorination using non-heme manganese catalyst are described herein. For example, a method comprises providing a reaction mixture including a non-heme manganese catalyst, a substrate comprising an sp3 C—H bond and a fluorinating agent and converting the sp3 C—H bond to a C—F bond in the presence of the non-heme manganese catalyst or a derivative thereof.