title: Cardiotonic agents. 5. 1,2-Dihydro-5-[4-(1H-imidazol-1-yl)phenyl]-6-methyl-2-oxo-3- pyridinecarbonitriles and related compounds. Synthesis and inotropic activity.
abstract: Several 1,2-dihydro-5-(substituted phenyl)-2(1H)-pyridinones were synthesized and evaluated for inotropic activity. 1,2-Dihydro-5-[4-(1H-imidazol-1-yl)phenyl]-6-methyl-2-oxo-3- pyridinecarbonitrile (5a) and the corresponding unsubstituted analogue 14a were the most potent positive inotropic agents in this series. Although the 4,6-dimethyl analogue 6a retained most of the activity of 5a, the 4-methyl analogue 8a was substantially less potent. The synthesis and structure-activity relationships are discussed.
mesh_terms: D000818:Animals; D002316:Cardiotonic Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D005260:Female; D007093:Imidazoles / Q000138:chemical synthesis* / Q000494:pharmacology; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects*; D009570:Nitriles / Q000138:chemical synthesis / Q000494:pharmacology; D011728:Pyridones / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D002316:Cardiotonic Agents; D007093:Imidazoles; D009570:Nitriles; D011728:Pyridones