1-R-4-Hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxylic acid pyrazin-2-ylamides have been synthesized as potential antitubercular agents. In contrast to pyrimidin-2-ylamides the compounds prepared are brominated by molecular bromine in glacial acetic acid at position 6 of the quinolone ring rather than in the amide part of the molecule. The 1-N-allyl derivative behaves similarly but undergoes halocyclization to give 2-bromomethyl-5-oxo-1,2-dihydro-5H-oxazolo[3,2-a]quinoline-4-carboxylic acid pyrazin-2-ylamide. A comparative analysis of the antimycobacterial properties of the synthesized compounds and their isomeric pyrimidin-2-ylamides has been carried out.
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*For Communication 167 see [1].
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1324–1337, September, 2009.
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Ukrainets, I.V., Grinevich, L.A., Tkach, A.A. et al. 4-Hydroxy-2-quinolones. 168*. Synthesis, chemical and antitubercular properties of 1-R-4-hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxylic acid pyrazin-2-ylamides. Chem Heterocycl Comp 45, 1058–1068 (2009). https://doi.org/10.1007/s10593-009-0384-6
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DOI: https://doi.org/10.1007/s10593-009-0384-6