Articles producció científica> Química Analítica i Química Orgànica

Chiral Auxiliary Approach for Gold(I)-Catalyzed Cyclizations

  • Identification data

    Identifier: imarina:9331756
    Authors:
    Cataffo, APena-Lopez, MPedrazzani, REchavarren, AM
    Abstract:
    Two different classes of stereoselective cyclizations have been developed using a chiral auxiliary approach with commercially available [JohnPhosAu(MeCN)SbF6] as catalyst. First, a stereoselective cascade cyclization of 1,5-enynes was achieved using the Oppolzer camphorsultam as chiral auxiliary. In this case, a one-pot cyclization-hydrolysis sequence was developed to directly afford enantioenriched spirocyclic ketones. Then, the stereoselective alkoxycyclization of 1,6-enynes was mediated by an Evans-type oxazolidinone. A reduction-hydrolysis sequence was selected to remove the auxiliary to give enantioenriched β-tetralones. DFT studies confirmed that the steric clash between the chiral auxiliary and alkene accounts for the experimentally observed diastereoselective cyclization through the Si face.
  • Others:

    Author, as appears in the article.: Cataffo, A; Pena-Lopez, M; Pedrazzani, R; Echavarren, AM
    Department: Química Analítica i Química Orgànica
    URV's Author/s: Cataffo, Andrea / ECHAVARREN PABLOS, ANTONIO
    Keywords: Spirocyclic ketones Intermolecular 2+2 cycloaddition Gold catalysis Enynes Chiral auxiliaries Alkoxycyclization unique spirocyclic ketones rearrangement gold catalysis enynes enantioselective construction cycloisomerizations chiral auxiliaries catalyzed reaction c-n alkynes alkenes
    Abstract: Two different classes of stereoselective cyclizations have been developed using a chiral auxiliary approach with commercially available [JohnPhosAu(MeCN)SbF6] as catalyst. First, a stereoselective cascade cyclization of 1,5-enynes was achieved using the Oppolzer camphorsultam as chiral auxiliary. In this case, a one-pot cyclization-hydrolysis sequence was developed to directly afford enantioenriched spirocyclic ketones. Then, the stereoselective alkoxycyclization of 1,6-enynes was mediated by an Evans-type oxazolidinone. A reduction-hydrolysis sequence was selected to remove the auxiliary to give enantioenriched β-tetralones. DFT studies confirmed that the steric clash between the chiral auxiliary and alkene accounts for the experimentally observed diastereoselective cyclization through the Si face.
    Thematic Areas: Química Medicina ii Medicina i Materiais Interdisciplinar General medicine General chemistry Farmacia Engenharias ii Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Chemistry, multidisciplinary Chemistry (miscellaneous) Chemistry (all) Chemistry Catalysis Astronomia / física
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: antoniomaria.echavarren@urv.cat andrea.cataffo@estudiants.urv.cat
    Author identifier: 0000-0002-6418-7930
    Record's date: 2024-08-03
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202312874
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Angewandte Chemie (International Ed. Print). 62 (49): e202312874-
    APA: Cataffo, A; Pena-Lopez, M; Pedrazzani, R; Echavarren, AM (2023). Chiral Auxiliary Approach for Gold(I)-Catalyzed Cyclizations. Angewandte Chemie (International Ed. Print), 62(49), e202312874-. DOI: 10.1002/anie.202312874
    Article's DOI: 10.1002/anie.202312874
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2023
    Publication Type: Journal Publications
  • Keywords:

    Catalysis,Chemistry,Chemistry (Miscellaneous),Chemistry, Multidisciplinary
    Spirocyclic ketones
    Intermolecular 2+2 cycloaddition
    Gold catalysis
    Enynes
    Chiral auxiliaries
    Alkoxycyclization
    unique
    spirocyclic ketones
    rearrangement
    gold catalysis
    enynes
    enantioselective construction
    cycloisomerizations
    chiral auxiliaries
    catalyzed reaction
    c-n
    alkynes
    alkenes
    Química
    Medicina ii
    Medicina i
    Materiais
    Interdisciplinar
    General medicine
    General chemistry
    Farmacia
    Engenharias ii
    Ciências biológicas iii
    Ciências biológicas ii
    Ciências biológicas i
    Chemistry, multidisciplinary
    Chemistry (miscellaneous)
    Chemistry (all)
    Chemistry
    Catalysis
    Astronomia / física
  • Documents:

  • Cerca a google

    Search to google scholar