4,5-Dihydro-6-[2-[4-(1H -imidazol-1-yl)phenyl]alkylenyl or alkylene-3(2H)-pyridazinones and related compounds and pharmaceutically acceptable acid addition salts thereof are useful as cardiotonic and antihypertensive agents. The above compounds cause a significant increase in myocardial contractility in the dog and also cause a decrease in blood pressure in the spontaneously hypertensive rat. The compounds are produced by reacting the appropriate .gamma.-oxobutanoic acid with a suitably substituted hydrazine to provide 4,5-dihydro-6-[4-[imidazolylphenyl]-alkenylene or alkylene-3(2H)-pyridazinones which may be oxidized to 6-[4-[imidazolylphenyl]alkenylene or alkylene-3(2H)-pyridazinones.
4,5-二氢-6-[2-[4-(
1H-咪唑-1-基)苯基]烯基或烷基]-3(2H)-
吡啶酮及其相关化合物和药物可接受的酸盐作为心脏强心和降压剂。上述化合物可导致犬心肌收缩力显著增加,同时导致自发性高血压大鼠血压降低。这些化合物通过将适当的γ-氧基
丁酸与适当取代的
肼反应而产生4,5-二氢-6-[4-[
咪唑基苯基]烯基或烷基]-3(2H)-
吡啶酮,可氧化为6-[4-[
咪唑基苯基]烯基或烷基]-3(2H)-
吡啶酮。