Abstract
Oxidative condensation of ketones, o-phenylenediamines, and malononitrile in the presence of acid catalysts and MnO2 gives 5-dicyanomethylene-2-R-2-R′-3,5-dihydro-2H-benzimidazoles. Changing the mono ketones to 1,5-diketones leads to 8-dicyanomethylene-3,4,4a,8-tetrahydropyrido[1,2-a]benzimidazoles.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1494–1497, November, 1992.
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Kaminskii, V.A., Pestova, O.G. & Mezhennaya, L.V. One stage synthesis of 5-dicyanomethylene-3,5-dihydro-2h-benzimidazoles. Chem Heterocycl Compd 28, 1277–1279 (1992). https://doi.org/10.1007/BF00532077
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DOI: https://doi.org/10.1007/BF00532077