PROCESS FOR PREPARING BASE-SUBSTITUTED PYRIDAZINES

Basically-substituted pyridazines of the formula: (I) wherein R1, R2 and R3, independently of one another, denote hydrogen, halogen, hydroxyl, nitro, trifluoromethyl, alkyl, alkoxyalkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, phenyl, alkoxy, hydroxyalkoxy, alkoxy-alkoxy, alkenyloxy, alkynyloxy, cycloalkoxy, phenalkoxy, alkanoyl, alkanoylamino and -NH-CO-R9, R9 representing morpholino, piperidino or 1-pyrrolididinyl, or an optionally substituted ureido radical, R4 denotes hydrogen or lower alkyl and W denotes hydrogen, chlorine or bromine; and the acid-addition salts thereof are useful alone or in pharmaceutical preparations for treating cardiac complaints, circulatory complaints and high blood pressure. Several methods for preparing the basically-substituted pyridazines are also provided.