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Switchable photocatalysis for the chemodivergent benzylation of 4-cyanopyridines

  • Identification data

    Identifier: imarina:9267367
    Authors:
    Georgiou ESpinnato DChen KMelchiorre P
    Abstract:
    We report a photocatalytic strategy for the chemodivergent radical benzylation of 4-cyanopyridines. The chemistry uses a single photoredox catalyst to generate benzyl radicals upon N-F bond activation of 2-alkyl N-fluorobenzamides. The judicious choice of different photocatalyst quenchers allowed us to select at will between mechanistically divergent processes. The two reaction manifolds, an ipso-substitution path proceeding via radical coupling and a Minisci-type addition, enabled selective access to regioisomeric C4 or C2 benzylated pyridines, respectively. Mechanistic investigations shed light on the origin of the chemoselectivity switch.
  • Others:

    Author, as appears in the article.: Georgiou E; Spinnato D; Chen K; Melchiorre P
    Department: Química Analítica i Química Orgànica
    URV's Author/s: Georgiou, Eleni / Spinnato, Davide
    Keywords: Radicals Ketones Heterocycles Electron-transfer C-h functionalization Arylation Alkylation Activation
    Abstract: We report a photocatalytic strategy for the chemodivergent radical benzylation of 4-cyanopyridines. The chemistry uses a single photoredox catalyst to generate benzyl radicals upon N-F bond activation of 2-alkyl N-fluorobenzamides. The judicious choice of different photocatalyst quenchers allowed us to select at will between mechanistically divergent processes. The two reaction manifolds, an ipso-substitution path proceeding via radical coupling and a Minisci-type addition, enabled selective access to regioisomeric C4 or C2 benzylated pyridines, respectively. Mechanistic investigations shed light on the origin of the chemoselectivity switch.
    Thematic Areas: Química Materiais Interdisciplinar General chemistry Farmacia Ciências biológicas iii Ciências biológicas i Chemistry, multidisciplinary Chemistry (miscellaneous) Chemistry (all) Astronomia / física
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: davide.spinnato@estudiants.urv.cat eleni.georgiou@estudiants.urv.cat
    Record's date: 2024-09-07
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://pubs.rsc.org/en/content/articlelanding/2022/sc/d2sc02698h
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Chemical Science. 13 (27): 8060-8064
    APA: Georgiou E; Spinnato D; Chen K; Melchiorre P (2022). Switchable photocatalysis for the chemodivergent benzylation of 4-cyanopyridines. Chemical Science, 13(27), 8060-8064. DOI: 10.1039/d2sc02698h
    Article's DOI: 10.1039/d2sc02698h
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2022
    Publication Type: Journal Publications
  • Keywords:

    Chemistry (Miscellaneous),Chemistry, Multidisciplinary
    Radicals
    Ketones
    Heterocycles
    Electron-transfer
    C-h functionalization
    Arylation
    Alkylation
    Activation
    Química
    Materiais
    Interdisciplinar
    General chemistry
    Farmacia
    Ciências biológicas iii
    Ciências biológicas i
    Chemistry, multidisciplinary
    Chemistry (miscellaneous)
    Chemistry (all)
    Astronomia / física
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