Condensation of 1,2-diaminobenzimidazole with N-arylitaconimides was studied. It was found that 2-(10-amino-N-aryl-2-oxo-2,3,4,10-tetrahydropyrimido[1,2-a]benzimidazol-3-yl)acetamides were formed in the course of this reaction upon brief heating to reflux of the reagent mixture in 2-propanol in the presence of catalytic amounts of acetic acid.
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This work was supported by the Federal targeted program ''Research and Development in the Priority Areas of Development of the Russian Scientific and Technological Complex for years 2014–2020.'' (Agreement № 14.577.21.0182, the unique identifier for applied scientific research RFMEFI57715X0182).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2016, 52(7), 493–497
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Vandyshev, D.Y., Shikhaliev, K.S., Kokonova, A.V. et al. A novel method for the synthesis of pyrimido[1,2-a]benzimidazoles. Chem Heterocycl Comp 52, 493–497 (2016). https://doi.org/10.1007/s10593-016-1914-7
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DOI: https://doi.org/10.1007/s10593-016-1914-7