“…On the other hand, organophosphorus compounds have received much attention whether linear or cyclic. They were demonstrated to be pesticides , herbicides , antifungal , anti‐inflammatory , anti‐HIV , anticancer , and good cytotoxic on K562 and colo205 cancerous cells . These aforementioned reasons with our interest in organophosphorus chemistry encouraged us to synthesize new organophosphorus compounds incorporating 1,2,4‐triazinone moiety through reaction of 4‐amino‐6‐methyl‐3‐sulfanyl‐1,2,4‐triazin‐5(4 H )‐one ( 1 ) with different phosphorus reagents.…”