The synthesis and the antitubercular activity of 1-benzyl-4-hydroxy-2-oxo-1,2,5,6,7,8-hexahydroquinoline-3-carboxamides

O. O. Davydenko

doi:10.24959/ophcj.15.851

Authors

O. O. Davydenko National Pirogov Memorial Medical University, Ukraine

DOI:

https://doi.org/10.24959/ophcj.15.851

Keywords:

amides, 4-hydroxy-2-oxo-1, 2-dihydroquinoline-3-carboxylic acids, synthesis, thermolysis, antitubercular activity

Abstract

Unfortunately, tuberculosis still remains a cause of high mortality in humans and in modern conditions it has become a global health problem. Continuing the search for new antimycobacterial agents among the amidated derivatives of 4-hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxylic acids the corresponding group of 1-benzyl-4-hydroxy-2-oxo-1,2,5,6,7,8-hexahydroquinoline-3-carboxamides has been synthesized by the reaction of ethyl 1-benzyl-4-hydroxy-2-oxo-1,2,5,6,7,8-hexahydroquinoline-3-carboxylate and anilines or hetarylamines in DMF at 130°C. The chemical structure of the compounds obtained has been confirmed by the data of elemental analysis, NMR 1H spectroscopy and mass spectrometry. It has been noted that the 1H NMR spectra can reliably confirm the presence of the basic functional groups by their corresponding chemical shift, the integrated intensity and multiplicity of signals. It has been shown that under the influence of the electron impact the molecular ions of all the compounds studied undergo the primary fragmentation in two directions: with breaking the amide bond or the quinolone nucleus – the carbamide moiety bond. According to the data of microbiological tests among 1-benzyl-4-hydroxy-2-oxo-1,2,5,6,7,8-hexahydroquinoline-3-carboxamides synthesized the substances that are capable of inhibiting actively the growth of Mycobacterium tuberculosis H37Rv in low concentration have been identified, and therefore, they are of interest for further research.

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