Abstract
It is shown that the reaction of o-phenylenediamine with isatins in the general case leads to mixtures of indolo[2,3-b]quinoxalines, 3-(2'-aminophenyl)-2(1H)-quinoxalinones, and spiro[2H-benzimidazoline-2,3'-indolin-2'-ones]. Spiro[2H-benzimidazole-2,3'-indolin-2'-ones] were isolated in individual cases.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 667–672, May, 1984.
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Ivashchenko, A.V., Drushlyak, A.G. & Titov, V.V. Reaction of o-phenylenediamine with isatins. Chem Heterocycl Compd 20, 537–542 (1984). https://doi.org/10.1007/BF00514308
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DOI: https://doi.org/10.1007/BF00514308