title: 2,3-Dihydro-9H-isoxazolo[3,2-b]quinazolin-9-ones and 3,4-dihydro-(1,2)-oxazino [3,2-b]quinazolin-10(2H)-ones.
abstract: Two series of compounds, 2,3-dihydro-9H-isoxazolo[3,2-b]quinazolin-9-ones and 3,4-dihydro-(1,2)-oxazino-[3,2-b]quinazolin-10(2H)-ones, were synthesized and evaluated for anti-inflammatory, antipyretic and analgesic activity. The isoxazolo compounds were generally more active than their oxazino homologs. Three compounds, i.e., 2,3-dihydro-9H-isoxazolo [3,2-b]quinazolin-9-one (W-2429) and its 2- and 3-methyl congeners, were the most active of all compounds tested in this study. On the basis of the biological results herein reported, W-2429 is considerably more effective than acetylsalicylic acid in inhibiting carrageenan-induced edema and in reducing brewer's yeast-induced fever in rats. Also, it was found to be more potent than propoxyphene hydrochloride in the Randall-Selitto test for analgesic activity.
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000138:chemical synthesis*; D007555:Isoxazoles / Q000138:chemical synthesis / Q000494:pharmacology; D010078:Oxazines / Q000138:chemical synthesis / Q000494:pharmacology; D011799:Quinazolines / Q000138:chemical synthesis* / Q000494:pharmacology; D051381:Rats; D013329:Structure-Activity Relationship
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D007555:Isoxazoles; D010078:Oxazines; D011799:Quinazolines