Reported herein is a visible‐light‐mediated radical approach to the α‐alkylation of ketones. This method exploits the ability of a nucleophilic organocatalyst to generate radicals upon SN2‐based activation of alkyl halides and blue light irradiation. The resulting open‐shell intermediates are then intercepted by weakly nucleophilic silyl enol ethers, which would be unable to directly attack the alkyl
The invention concerns a new process for the preparation of ketones; according to this process ketones are prepared from aldehydes and unsaturated compounds in the presence of bases using quaternary ammonium salts as catalysts.
Iron(III)-Light-Induced Homolysis: A Dual Photocatalytic Approach for the Hydroacylation of Alkenes Using Acyl Radicals via Direct HAT from Aldehydes
作者:Anurag Chinchole、Marco A. Henriquez、Diego Cortes-Arriagada、Alan R. Cabrera、Oliver Reiser
DOI:10.1021/acscatal.2c03315
日期:2022.11.4
generate acyl radicals from readily available aldehydes via hydrogen atom transfer (HAT). Synergistic cooperation, being supported by DFT studies, between earth-abundant iron(III)chloride and 9,10-diphenylanthracene (DPA) to activate the aldehyde for a HAT step proved to be an efficient, economic, and green route for the hydroacylation of electron-deficientalkenes under UV-light irradiation with broad functional
Decatungstate‐Catalyzed Carbon‐Carbon Bond Formation Between Furfural and Electron‐Deficient Olefins
作者:Emil Krogh Nielsen、Kassem El‐Chami、Clara Mondrup de Lichtenberg、Robert Madsen
DOI:10.1002/ejoc.202400109
日期:2024.4.22
Functionalization of furfural can be achieved by photocatalytic C−H activation of the aldehyde and coupling to electron-deficient olefins. With (Bu4N)4W10O32 as the photocatalyst, furfural can be added to benzylidene malononitriles, acrylates, itaconic anhydride, maleic anhydride, 2-vinylpyridine and phenyl vinyl sulfone to form the corresponding furanyl ketones in moderate-to-good yields.