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    Sequential Functionalization of Alkynes and Alkenes Catalyzed by Gold(I) and Palladium(II) N-Heterocyclic Carbene Complexes

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    Type
    Article
    Authors
    Gómez-Herrera, Alberto
    Nahra, Fady cc
    Brill, Marcel
    Nolan, Steven P. cc
    Cazin, Catherine S. J. cc
    KAUST Grant Number
    OSR-2015-CCF-1974–03
    Date
    2016-09-26
    Online Publication Date
    2016-09-26
    Print Publication Date
    2016-11-08
    Permanent link to this record
    http://hdl.handle.net/10754/623590
    
    Metadata
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    Abstract
    The iodination of terminal alkynes for the synthesis of 1-iodoalkynes using N-iodosuccinimide in the presence of a AuI-NHC (NHC=N-heterocyclic carbene) catalyst is reported. A series of aromatic alkynes was transformed successfully into the corresponding 1-iodoalkynes in good to excellent yields under mild reaction conditions. The further use of these compounds as organic building blocks and the advantageous choice of metal-NHC complexes as catalysts for alkyne functionalization were further demonstrated by performing selective AuI-catalyzed hydrofluorination to yield (Z)-2-fluoro-1-iodoalkenes, followed by a Suzuki–Miyaura cross-coupling with aryl boronic acids catalyzed by a PdII-NHC complex to access trisubstituted (Z)-fluoroalkenes. All methodologies can be performed sequentially with only minor variations in the optimized individual reaction conditions, maintaining high efficiency and selectivity in all cases, which therefore, provides straightforward access to valuable fluorinated alkenes from commercially available terminal alkynes.
    Citation
    Gómez-Herrera A, Nahra F, Brill M, Nolan SP, Cazin CSJ (2016) Sequential Functionalization of Alkynes and Alkenes Catalyzed by Gold(I) and Palladium(II) N-Heterocyclic Carbene Complexes. ChemCatChem 8: 3381–3388. Available: http://dx.doi.org/10.1002/cctc.201600868.
    Sponsors
    The authors gratefully acknowledge the Royal Society (University Research Fellowship to C.S.J.C.), Syngenta (studentship to A.G.H.), King Saud University (S.P.N.) and the EPSRC (EP/K503162/1) for funding. We are also grateful to Umicore for the loan of Pd complexes and to the EPSRC National Mass Spectrometry Service Centre at Swansea University for HRMS analyses. This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2015-CCF-1974–03.
    Publisher
    Wiley
    Journal
    ChemCatChem
    DOI
    10.1002/cctc.201600868
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/cctc.201600868/full
    ae974a485f413a2113503eed53cd6c53
    10.1002/cctc.201600868
    Scopus Count
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