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Synthesis 2010(23): 4075-4081
DOI: 10.1055/s-0030-1258289
DOI: 10.1055/s-0030-1258289
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Synthesis of 3-Heteroaryloxindoles through t-BuOCl-Mediated Oxidation of 3-Heteroarylindoles
Further Information
Received
23 July 2010
Publication Date:
07 October 2010 (online)
Publication History
Publication Date:
07 October 2010 (online)

Abstract
The oxidation of 3-heteroarylindoles to the corresponding oxindoles with t-butyl hypochlorite has been investigated. Under carefully adjusted conditions, preparative scale of desired products can be achieved. Two competing pathways seem to contribute to the reaction mechanism, affording 3-heteroaryloxindoles bearing hydrogen or chlorine at C3, depending on stereoelectronic factors. The present methodology appears also generally applicable for the preparation of simple 3-aryloxindoles.
Key words
indole - oxindole - t-BuOCl - oxidation - heterocycles
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References
We also included the preparation of compound 3c, which, strictly speaking, is not a heteroaryl derivative, but could serve to test the generality of the proposed methodology.