Synthesis of some novel 3,7‐dimethyl‐4<i>H</i>‐pyrazolo[5,1‐c][1,2,4]triazin‐4‐ones

Abstract

Abstract Some novel 3,7‐dimethyl‐6 H ‐pyrazolo[5,1‐c][1,2,4]triazin‐4‐ones were prepared (3a‐g) . Compounds 3a,b were treated with hydrazines to afford various products 7a,b, 8a,b, 9 and lla,b depending on the type of hydrazine derivative and reaction conditions. The benzoyloxyimino‐pyrazolo[5,1‐c][1,2,4]triazines (13a,b) were synthesized by refluxing of compounds 3a,b with hydroxylamine hydrochloride to afford the corresponding oxime derivatives followed by treatment with benzoyl chloride.