The dehydrogenation of indolines to indoles without using mineral oxidising reagents is described. The conversion was achieved via either azasulphonium salts or N-chloramines, the former route involving milder conditions but a more complex procedure.
M. Kawase, Y. Miyake and Y. Kikugawa, J. Chem. Soc., Perkin Trans. 1, 1984, 1401 DOI: 10.1039/P19840001401
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