... As a continuation of these previous reports on the chemistry and pharmacology of 6-aryl-5-substituted-3(2 ... can be used as promising starting compounds for further synthe- ses of fused heterocyclic systems ... d, IH, J = 2.03, o-Ph), 7.16 (s, 1 H, H pyridazinone), 7.2 (dd, IH, J = ...