G A Pinna, M M Curzu, D Barlocco, G Cignarella, E Cavalletti, M Germini, K Berger
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Synthesis and pharmacological study of 5-aryl-6-methyl-4,5-dihydro-pyridazin-3(2H)ones and related 5-aryl-6-methyl-pyridazin-3(2H)ones.
New 5-aryl-6-methyl-4,5-dihydropyridazin-3(2H)ones (III) and related 5-aryl-6-methyl-pyridazin-3(2H)ones (IV) were synthesized in order to evaluate their pharmacological profile in comparison with that of the known class of antihypertensive and platelet aggregation inhibitors 5-methyl-6-aryl-4,5-dihydropyridazin 3(2H)ones (I). Though none of the tested derivatives was found to possess the antihypertensive potency of the reference compounds, some of them displayed significant antithrombotic and antiulcer properties. In particular, 5(p. acetylaminophenyl)-6-methyl-pyridazin-3-one (IV c) was found highly effective (ED50 = 1.2 mg/kg) in inhibiting indomethacin-induced ulcers.
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