title: Studies on some 3(2H)-pyridazinone derivatives with antinociceptive activity.
abstract: Nineteen new [6-(4-methoxyphenyl)-3(2H)-pyridazinone-2-yl]-acetamide (1-10) and 3-[6-(4-methoxyphenyl)-3(2H)-pyridazin-one-2-yl]propanamide (11-19) derivatives have been synthesized in this study. The structures of the compounds have been elucidated by their IR and NMR spectral data and elemental analysis. Antinociceptive activity of the compounds has been investigated by modified Koster's Test in mice, using aspirin as a reference. All the compounds (at 100 mg/kg dose) except 1 and 9 have been found more potent than aspirin. Compound 6 in the group of acetamide derivatives and compound 15 in the group of propanamides exhibited the highest antinociceptive activity. In addition, the propanamides have generally been found more potent than acetamides. In addition to these studies, the quantitative relationships between some structural parameters (such as log P, parachor, molar refractivity, and molecular connectivity indices) and antinociceptive activity of the compounds have been investigated. Statistical regression analysis has shown a close relationship to exist between the first-order molecular connectivity index (1 chi) and the antinociceptive activity.
authors.affiliation: Gazi University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Ankara, Turkey.
authors.forename: D S
authors.initials: DS
authors.lastname: Dogruer
authors.forename: M F
authors.initials: MF
authors.lastname: Sahin
authors.forename: S
authors.initials: S
authors.lastname: Unlü
authors.forename: S
authors.initials: S
authors.lastname: Ito
mesh_terms: D000081:Acetamides / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000577:Amides / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000700:Analgesics / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D007659:Ketones / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D051379:Mice; D010147:Pain Measurement; D011724:Pyridazines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D013055:Spectrophotometry, Infrared; D013329:Structure-Activity Relationship
chemical_list: D000081:Acetamides; D000577:Amides; D000700:Analgesics; D000894:Anti-Inflammatory Agents, Non-Steroidal; D007659:Ketones; D011724:Pyridazines