Heating indole with arenesulphonyl azides yields 2-arylsulphonyliminoindolines; similar treatment of 1-methylindole affords mainly the 2-arylsulphonylimino-1-methylindolines with, as minor products, the 3-arylsulphonyl-aminoindoles. In the presence of pyridine, 2-arylsulphonylimino-3-diazoindolines are formed.
A. S. Bailey, A. J. Buckley, W. A. Warr and J. J. Wedgwood, J. Chem. Soc., Perkin Trans. 1, 1972, 2411 DOI: 10.1039/P19720002411
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