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Cyclobutene vs 1,3-Diene Formation in the Gold-Catalyzed Reaction of Alkynes with Alkenes: The Complete Mechanistic Picture

  • Identification data

    Identifier: PC:3092
    Authors:
    Echavarren, A.M.De Orbe, M.E.Amenós, L.Kirillova, M.S.Wang, Y.López-Carrillo, V.Maseras, F.
    Abstract:
    URL: https://pubs-acs-org.sabidi.urv.cat/doi/abs/10.1021/jacs.7b03005 DOI: 10.1021/jacs.7b03005 Filiació URV: SI
  • Others:

    Author, as appears in the article.: Echavarren, A.M. ; De Orbe, M.E.; Amenós, L.; Kirillova, M.S. ; Wang, Y.; López-Carrillo, V.; Maseras, F.
    Department: Química Analítica i Química Orgànica
    URV's Author/s: ECHAVARREN PABLOS, ANTONIO MARIA; De Orbe, M.E.; Amenós, L.; Kirillova, M.S. ; Wang, Y.; López-Carrillo, V.; Maseras, F.
    Keywords: Gold catalysis
    Abstract: The intermolecular gold(I)-catalyzed reaction between arylalkynes and alkenes leads to cyclobutenes by a [2 + 2] cycloaddition, which takes place stepwise, first by formation of cyclopropyl gold(I) carbenes, followed by a ring expansion. However, 1,3-butadienes are also formed in the case of ortho-substituted arylalkynes by a metathesis-type process. The corresponding reaction of alkenes with aryl-1,3-butadiynes, ethynylogous to arylalkynes, leads exclusively to cyclobutenes. A comprehensive mechanism for the gold(I)-catalyzed reaction of alkynes with alkenes is proposed on the basis of density functional theory calculations, which shows that the two pathways leading to cyclobutenes or dienes are very close in energy. The key intermediates are cyclopropyl gold(I) carbenes, which have been independently generated by retro-Buchner reaction from stereodefined 1a,7b-dihydro-1H-cyclopropa[a]naphthalenes.
    Thematic Areas: Chemistry Química Química
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 0002-7863
    Author identifier: 0000-0001-6808-3007; ; ; ; ; ;
    Record's date: 2018-02-05
    Last page: 10311
    Journal volume: 139
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://pubs.acs.org/doi/abs/10.1021/jacs.7b03005
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Article's DOI: 10.1021/jacs.7b03005
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2017
    First page: 10302
    Publication Type: Article Artículo Article
  • Keywords:

    Or
    Catàlisi
    Gold
    catalysis
    Chemistry
    Química
    Química
    0002-7863
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