title: A novel synthesis and potent antiinflammatory activity of 4-hydroxy-2(1H)-oxo-1-phenyl-1,8-naphthyridine-3-carboxamides.
abstract: New antiinflammatory agents 4-hydroxy-2(1H)-oxo-1-phenyl-1,8-naphthyridine-3- carboxamides 7 were designed and synthesized via a valuable intermediate, 1-phenyl-2H-pyrido[2,3-d][1,3]oxazine-2,4(1H)-dione (9). The nature of substituents on the amide nitrogen had a pronounced effect on antiinflamatory activity. Studies of structure-activity relationships led to compounds 33 and 34 bearing a pyridine ring on the amide nitrogen. Compounds 33 and 34 were active against carrageenin-, zymosan-, and arachidonic acid-induced rat paw edemas and also potently inhibited the reversed passive Arthus reaction in rats. Thus, they possess a broader spectrum of antiinflammatory activity than the classical nonsteroidal antiinflammatory drugs (NSAIDs) such as indomethacin and piroxicam.
authors.affiliation: Pharmaceutical Research Laboratories, Kyowa Hakko Kogyo Co., Ltd., Shizuoka, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kuroda
authors.forename: F
authors.initials: F
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Tamura
authors.forename: K
authors.initials: K
authors.lastname: Ohmori
authors.forename: H
authors.initials: H
authors.lastname: Hosoe
mesh_terms: D000818:Animals; D000893:Anti-Inflammatory Agents; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002351:Carrageenan / Q000037:antagonists & inhibitors; D004487:Edema / Q000517:prevention & control; D008297:Male; D009287:Naphthyridines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D013329:Structure-Activity Relationship; D015054:Zymosan / Q000037:antagonists & inhibitors
chemical_list: D000893:Anti-Inflammatory Agents; D000894:Anti-Inflammatory Agents, Non-Steroidal; D009287:Naphthyridines; D002351:Carrageenan; D015054:Zymosan