Fusing 1,2-diaminodibenzothiophene dihydrochloride with urea and thiourea led to the formation of benzo[b]thiophene[3,2-e]benzimidazolone and benzo[b]thiophene[3,2-e]benzimidazolethione. 3H-Benzo-[b]thiophene[3,2-e]benzimidazole was used to obtain 3-ethylbenzo[b]thiophene[3,2-e]benzimidazole, 3-ethylbenzo[b]thiophene[3,2-e]benzimidazole-2-thione, and 3-ethylbenzo[b]thiophene[3,2-e]benz-imidazole-2-sulfonic acid.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, pp. 1924-1927, December, 2012.
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Maisuradze, M.G., Ananiashvili, V.O., Alapishvili, M.G. et al. Some new 3H-benzo[b]thiophene-[3,2-e]benzimidazole derivatives. Chem Heterocycl Comp 48, 1801–1804 (2013). https://doi.org/10.1007/s10593-013-1211-7
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DOI: https://doi.org/10.1007/s10593-013-1211-7