title: Studies on antiplatelet agents. I. Synthesis and platelet inhibitory activity of 5-alkyl-2-aryl-4-pyridylimidazoles.
abstract: 5-Alkyl-2-aryl-4-pyridylimidazoles were synthesized and tested in rat ex vivo platelet aggregation studies. Among these compounds, 2-(2-fluorophenyl)-5-methyl-4-(3-pyridyl)imidazole (25) was most potent, and showed 98% inhibition at a dose of 10 mg/kg (p.o.). 25 had inhibitory activity on cyclooxygenase, thromboxane A2 (TXA2) synthetase, and phosphodiesterase, and also showed inhibited KCl-induced contraction of rat aorta. All compounds have little acute toxicity and appear to be free of adverse effects on the stomach.
authors.affiliation: New Drug Research Laboratories, Fujisawa Pharmaceutical Co., Ltd., Osaka, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Ito
authors.forename: S
authors.initials: S
authors.lastname: Nishino
authors.forename: Y
authors.initials: Y
authors.lastname: Motoyama
authors.forename: H
authors.initials: H
authors.lastname: Takasugi
mesh_terms: D000818:Animals; D016861:Cyclooxygenase Inhibitors / Q000138:chemical synthesis / Q000494:pharmacology / Q000633:toxicity; D006801:Humans; D007093:Imidazoles / Q000138:chemical synthesis* / Q000494:pharmacology* / Q000633:toxicity; D008297:Male; D009130:Muscle, Smooth / Q000187:drug effects; D010726:Phosphodiesterase Inhibitors / Q000138:chemical synthesis / Q000494:pharmacology / Q000633:toxicity; D010975:Platelet Aggregation Inhibitors / Q000138:chemical synthesis* / Q000494:pharmacology* / Q000633:toxicity; D011817:Rabbits; D051381:Rats; D017207:Rats, Sprague-Dawley; D013276:Stomach Ulcer / Q000139:chemically induced; D013329:Structure-Activity Relationship; D013928:Thromboxane A2 / Q000037:antagonists & inhibitors
chemical_list: D016861:Cyclooxygenase Inhibitors; D007093:Imidazoles; D010726:Phosphodiesterase Inhibitors; D010975:Platelet Aggregation Inhibitors; D013928:Thromboxane A2