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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.

Studies on Antiplatelet Agents. I. Synthesis and Platelet Inhibitory Activity of 5-Alkyl-2-aryl-4-pyridylimidazoles.