8‐Fluoro‐4‐hydroxy‐1H‐[1,2,4]triazino[4,5‐a]quinoline‐1,6(2H)‐dione: Synthesis and reactivity

A simple and versatile methodology to synthesise 4‐hydroxy‐1H‐1,2,4]triazino4,5‐a]quinoline‐1,6(2H)‐dione from methyl 6‐fluoro‐4‐oxo‐1,4‐dihydro‐2‐quinolinecarboxylate has been developed. It involves car‐bohydrazide 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.