Intramolecular acid catalysed cyclisation of the ketene dithioacetal S-oxide (3) from the o-toluenesulphonamidobenzaldehyde (2) leads to two indole derivatives (5) and (6), the structure (6) being confirmed by X-ray crystallography.
A. T. Hewson, L. A. March, I. W. Nowell and S. K. Richardson, J. Chem. Soc., Chem. Commun., 1985, 618 DOI: 10.1039/C39850000618
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