title: 2-pyridylimidazoles as inhibitors of xanthine oxidase.
abstract: A series of 28 4-substituted and 4,5-disubstituted 2-pyridylimidazoles was synthesized and evaluated in vitro for inhibition of xanthine oxidase. Included within this group are examples of 2-pyridylimidazopyridines and halo-substituted 2-pyridylbenzimidazoles. Five compounds exhibited inhibitory activity in the same range as the standards, 4-hydroxypyrazolo[3,4-d]pyrimidine and 2-(4-pyridyl)-4-trifluoromethylimidazole (22). Two examples, 2-(4-pyridyl)-4,5-dicyanoimidazole (16) and 2-(4-pyridyl)-4-nitroimidazole (3), were at least an order of magnitude more active than the standards and therefore rank among the most potent known inhibitors of the enzyme.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D007093:Imidazoles / Q000138:chemical synthesis / Q000494:pharmacology*; D011725:Pyridines / Q000138:chemical synthesis / Q000494:pharmacology; D014969:Xanthine Oxidase / Q000037:antagonists & inhibitors*
chemical_list: D007093:Imidazoles; D011725:Pyridines; D014969:Xanthine Oxidase