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Issue 20, 2019
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Au-catalyzed skeletal rearrangement of O-propargylic oximes via N–O bond cleavage with the aid of a Brønsted base cocatalyst

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Abstract

O-Propargylic oximes that possess an electron-withdrawing aryl group on the oxime moiety undergo Au-catalyzed skeletal rearrangements via N–O bond cleavage to afford the corresponding 2H-1,3-oxazine derivatives. Our studies show that the inclusion of a Brønsted base cocatalyst not only accelerates the reaction but also switches pathways of the skeletal rearrangement reaction, realizing divergent synthesis of heterocyclic compounds. Computational studies indicate that the elimination of propargylic proton in the cyclized vinylgold intermediate is rate-determining and both electron-withdrawing substituents at the oxime moiety and base cocatalyst facilitate the proton elimination. Moreover, the protodeauration process proceeds stepwise involving N–O bond cleavage followed by recyclization to construct the oxazine core.

Graphical abstract: Au-catalyzed skeletal rearrangement of O-propargylic oximes via N–O bond cleavage with the aid of a Brønsted base cocatalyst

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Publication details

The article was received on 28 Jan 2019, accepted on 16 Apr 2019 and first published on 18 Apr 2019


Article type: Edge Article
DOI: 10.1039/C9SC00501C
Chem. Sci., 2019,10, 5283-5289
  • Open access: Creative Commons BY-NC license
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    Au-catalyzed skeletal rearrangement of O-propargylic oximes via N–O bond cleavage with the aid of a Brønsted base cocatalyst

    K. Shiga, I. D. Gridnev, M. Terada and I. Nakamura, Chem. Sci., 2019, 10, 5283
    DOI: 10.1039/C9SC00501C

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