3‐(Arylamino)‐1,2,4‐triazin‐5‐one: A Novel Synthesis and Its Use

An optimized procedure is given for the synthesis of novel 3-(arylamino)-1,2,4-triazin-5-one building blocks from commercially available material. By employing these building blocks, a practical protocol is described for the functionalization of the 5-position of the triazine core with anilines orphenols.