9-Carboxamide derivatives of the quinolizidine alkaloid methylcytisine were synthesized. The synthetic pathway included nitration-reduction according to the literature that resulted in 9-amination of the 2-pyridone core of the starting alkaloid. The obtained 9-amino derivative was converted by CS2 in Py in the presence of dicyclohexylcarbodiimide (DCC) into the corresponding isothiocyanate. The synthesized 9-isothio derivative was reacted with primary and secondary amines. The yields of the obtained 9-thiocarboxamide methylcytisine derivatives were 80–98%. The structures of the synthesized compounds were established using elemental analyses and IR, PMR, 13C NMR, and 15N NMR spectroscopy.
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The work was performed in the framework of a State Task for UfIC, UFRC, RAS, on topics Nos. AAAA-A17-117011910025-6 and AAAA-A17-117011910027-0.
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Petrova, P.R., Koval’skaya, A.V., Lobov, A.N. et al. Synthesis of Methylcytisine 9-Thiocarboxamides. Chem Nat Compd 55, 908–913 (2019). https://doi.org/10.1007/s10600-019-02843-z
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DOI: https://doi.org/10.1007/s10600-019-02843-z