title: A new nonsteroidal analgesic-antiinflammatory agent. Synthesis and activity of 4-ethoxy-2-methyl-5-morpholino-3(2H)-pyridazinone and related compounds.
abstract: In order to examine analgesic and antinflammatory activities, various 2-alkyl- or 2-alkenyl-4-alkoxy-5-(substituted amino)-3(2H)-pyridazinones were prepared. Among the compounds prepared, 4-ethoxy-2-methyl-5-morpholino-3(2H)-pyridazinone (8) was evaluated to be the most attractive compound as an analgesic-antiinflammatory agent. Compound 8 was shown to be more potent in analgesic and antiinflammatory activities and less potent in toxicity than aminopyrine and phenylbutazone. Some pyridazinone derivatives in which possible active sites of 8 are eliminated and altered were prepared, and their activities were evaluated by means of analogous assays. On the basis of available data, the structure-activity relationship in a series of 4-alkoxy-2-substituted-5-(substituted amino)-3(2H)-pyridazinones was also discussed.
mesh_terms: D000085:Acetates / Q000037:antagonists & inhibitors; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000138:chemical synthesis*; D002351:Carrageenan; D004487:Edema / Q000139:chemically induced / Q000503:physiopathology; D007928:Lethal Dose 50; D008297:Male; D051379:Mice; D009025:Morpholines / Q000138:chemical synthesis* / Q000494:pharmacology / Q000633:toxicity; D011724:Pyridazines / Q000138:chemical synthesis* / Q000494:pharmacology / Q000633:toxicity; D051381:Rats; D013329:Structure-Activity Relationship
chemical_list: D000085:Acetates; D000894:Anti-Inflammatory Agents, Non-Steroidal; D009025:Morpholines; D011724:Pyridazines; D002351:Carrageenan; C018432:emorfazone