A simple and versatile methodology to synthesise 4-hydroxy-1H-[1,2,4]triazino[4,5-a]quinoline-1,6(2H)dione from methyl 6-fluoro-4-oxo-1,4-dihydro-2-quinolinecarboxylate has been developed. It involves carbohydrazide formation followed by a condensation with triphosgene to form the fused [1,2,4]triazino ring. In addition, the reactivity of the [1,2,4]triazino ring has been studied.
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