A new spiro derivative of dihydro-1,2,3-triazolo[1,5-a]pyrimidine – 5'-amino-6'-cyano-4'H-spiro[cyclohexane-1,7'-[1,2,3]triazolo[1,5-a]-pyrimidine]-3'-carboxamide – was prepared by three-component reaction of 5-amino-1,2,3-triazole-4-carboxamide with malononitrile and cyclohexanone; the structure of product was established by X-ray analysis. Microwave activation and conventional heating showed the formation of single product and the same direction of heterocyclization. Available literature data concerning similar reactions using 3-amino-1,2,4-triazole or 2-aminobenzimidazole were reinvestigated experimentally with consideration of alternative structures; structures of products were studied by NMR including NOE experiments.
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Supplementary information file containing 1H and 13C NMR spectra of compounds 11, 12, and 14, 1D NOE spectra of compound 11, and arrangement of molecules 14 in crystal according to X-ray data is available at the journal website at http://link.springer.com/journal/10593.
Published in Khimiya Geterotsiklicheskikh Soedinenii, 2018, 54(12), 1139–1144
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Gladkov, E.S., Sirko, S.M., Musatov, V.I. et al. New spiro derivative of dihydro-1,2,3-triazolo[1,5-a]pyrimidine as a product of multicomponent reaction. Chem Heterocycl Comp 54, 1139–1144 (2018). https://doi.org/10.1007/s10593-019-02405-9
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DOI: https://doi.org/10.1007/s10593-019-02405-9