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Synthesis of Functionalized 1,4-Azaborinines by the Cyclization of Di-tert-butyliminoborane and Alkynes

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    Synthesis of Functionalized 1,4-Azaborinines by the Cyclization of Di-tert-butyliminoborane and Alkynes
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    † Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
    ‡ Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K.
    § Insitute für Organische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
    *[email protected]
    *[email protected]
    *[email protected]
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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2016, 138, 26, 8212–8220
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    https://doi.org/10.1021/jacs.6b04128
    Published June 10, 2016
    Copyright © 2016 American Chemical Society
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    Abstract

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    Di-tert-butyliminoborane is found to be a very useful synthon for the synthesis of a variety of functionalized 1,4-azaborinines by the Rh-mediated cyclization of iminoboranes with alkynes. The reactions proceed via [2 + 2] cycloaddition of iminoboranes and alkynes in the presence of [RhCl(PiPr3)2]2, which gives a rhodium η4-1,2-azaborete complex that yields 1,4-azaborinines upon reaction with acetylene. This reaction is compatible with substrates containing more than one alkynyl unit, cleanly affording compounds containing multiple 1,4-azaborinines. The substitution of terminal alkynes for acetylene also led to 1,4-azaborinines, enabling ring substitution at a predetermined location. We report the first general synthesis of this new methodology, which provides highly regioselective access to valuable 1,4-azaborinines in moderate yields. A mechanistic rationale for this reaction is supported by DFT calculations, which show the observed regioselectivity to arise from steric effects in the B–C bond coupling en route to the rhodium η4-1,2-azaborete complex and the selective oxidative cleavage of the B–N bond of the 1,2-azaborete ligand in its subsequent reaction with acetylene.

    Copyright © 2016 American Chemical Society

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/jacs.6b04128.

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    • Crystallographic data for 3, 4, 6, 8–10, and 12 (CIF)

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    This article is cited by 47 publications.

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    Cite this: J. Am. Chem. Soc. 2016, 138, 26, 8212–8220
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jacs.6b04128
    Published June 10, 2016
    Copyright © 2016 American Chemical Society
    Request reuse permissions

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