Chemistry of indole

Under the influence of phosphorus oxychloride in an inert solvent, 1-aryl-2-acylhydrazines undergo intramolecular rearrangement to give 2-amino-3-alkylindoles. The latter are autooxidized in alkaline media to give 3-hydroxy-2-aminoindolenines or 3-hydroxy-2-iminoindolines. The structures of all of the compounds were proved by UV, IR, and PMR spectroscopy and also by mass-spectrometric data.See [1] for communication XXXIV.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 511–515, April, 1973.