3-(Arylthio)indoles (1), in which the aryl group is an electron-rich ring system, undergo a novel structural rearrangement to 2-(2-aminophenyl)benzothiophenes (2) upon heating in polyphosphoric acid.
P. Hamel, Y. Girard, J. G. Atkinson and M. A. Bernstein, J. Chem. Soc., Chem. Commun., 1990, 1072 DOI: 10.1039/C39900001072
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