Abstract
The corresponding indolo[2,3-b]quinoxalines and spiro(benzimidazoline-2,3′-indoline)-2′-ones are formed in the reaction of 2,5-dibutoxy-o-phenylenediamine (I) with 5-nitro- and N-acetylisatin in 50–80% acetic acid, while the corresponding spiro(2H-benzimidazole-2,3′-indole)-2′-ones are formed additionally in the reaction of 2,5-dibutoxy- and 2,5-diheptyloxy-o-phenylenediamine with isatin and N-methylisatin. 6-Acyl and 6- and 5-alkyl derivatives were obtained as a result of acylation and alkylation of a number of 6H-indolo[2,3-b]quinoxalines; the 5-substituted compounds are formed in trace amounts. The IR and electronic spectra of the synthesized compounds were studied.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 249–254, February, 1981.
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Ivashchenko, A.V., Agafonova, I.F. Synthesis and study of indolo[2,3-b]quinoxaline derivatives. Chem Heterocycl Compd 17, 184–189 (1981). https://doi.org/10.1007/BF00507254
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DOI: https://doi.org/10.1007/BF00507254