6-Hydrazino 3- phenyl-pyridazines and salts - with vasodilator and beta-adrenergic blocking activity for treating cardiovascular disorders

摘要

6-Hydrazino-3-phenylpyridazines of formula (I): together with their acid addition salts (where one of R1 and R2 is H, the other is H, F, Cl, Br, Me, OH, -OMe, -CH2OH, CN, NO2 or NH2; R3 is H or Me; R4 is Pr1, But or phenethyl) are vasodilators and beta-adrenergic blockers. Specif. claimed are the four cpds. where R2 and R3 are H; R4 is But; and R1 is H, Me, Cn or F, esp. with the S-configuration.