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Abstract 2,4-Di- and 2,4,6-trisubstituted quinazolines (II) were prepared from 2,3-di- and 2,3,5-trisubstituted indoles (I) respectively by the sensitized photo-oxygenation in aqueous methanol in the presence of ammonium acetate or by fusion with ammonium acetate after the photo-oxygenation. Chemical evidences that II was produced via the hydroperoxide (III) of the indole and then the dicarbonyl compound (IV) were provided.
Maeda et al. (Fri,) studied this question.