Pyridines of the formula I ##STR1## wherein R.sub.1 is free hydroxyl, lower alkoxy, cycloalkoxy, amino-lower alkoxy or lower alkoxy-lower alkoxy, free amino, hydroxyamino, lower alkyleneamino, oxa-, aza- or thia-lower alkyleneamino or mono- or di-lower alkylamino, R.sub.2 is oxygen or sulphur, R.sub.3 and R.sub.4 are each alkoxy, free amino, mono- or di-lower alkylamino, lower alkyleneamino, oxa-, aza- or thia-lower alkyleneamino, halogen or free hydroxyl, and either R.sub.3 or R.sub.4 can be hydrogen, and alk is an alkyl group with 3-10 carbon atoms, and their N-oxides, and salts are useful as dopamine-.beta.-hydroxylase inhibitors.
式I中的
吡啶化合物,其中R.sub.1为自由羟基,较低的烷氧基,环烷氧基,
氨基-较低的烷氧基或较低的烷氧基-较低的烷氧基,自由
氨基,羟基
氨基,较低的烷基
氨基,氧杂,氮杂或
硫杂较低的烷基
氨基或单烷基或双烷基
氨基,R.sub.2为氧或
硫,R.sub.3和R.sub.4分别为烷氧基,自由
氨基,单烷基或双烷基
氨基,较低的烷基
氨基,氧杂,氮杂或
硫杂较低的烷基
氨基,卤素或自由羟基,且R.sub.3或R.sub.4可以是氢,而alk是具有3-10个碳原子的烷基,它们的N-氧化物和盐作为
多巴胺-β-羟化酶
抑制剂是有用的。