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Direct interaction of dithizone with 7-chloro-6- fluoro-8-nitro-4-oxoquinoline-3-carboxylic acid or with its ester delivered the corresponding novel 1,3,4-thiadiazino [5,6- h ]quinoline 3-carboxylic acid, or its ester which was then hydrolyzed to the respective acid. Structures of the latter tricyclic hybrids were deduced from analytical and spectral data and confirmed by single crystal X-ray structure determination of the ester derivative. The free acid showed moderate activity against  Staphylococcus aureus  with a MIC value of 25 μg mL −1 .

zeitschrift für naturforschung b

Heterocycles [ h ]-fused onto 4-oxoquinoline-3-carboxylic acid. Part XII: synthesis of 5-fluoro-7-oxodihydo[1,3,4]thiadiazino [5,6- h ]quinoline-8-carboxylic acid and ester