Heterocyclic compounds of the formula ##STR1## wherein Het denotes optionally substituted pyridazinyl, pyrimidinyl, pyrazinyl or substituted pyridyl, R.sub.1 is hydrogen or methyl and R.sub.2 is lower alkyl, optionally substituted phenyl-lower alkyl, carboxy-lower alkyl or functionally modified carboxy-lower alkyl, their condensation products with aldehydes, ketones or carbonic acid and their N-oxides, which are valuable (cardioselective) .beta.-rezeptor blocking agents, and/or (cardioselective) .beta.-rezeptor-stimulants.
该公式表示的
杂环化合物,其中Het表示可选择替代的
吡啶啉基、
嘧啶基、
吡嗪基或取代的
吡啶基,R.sub.1是
氢或
甲基,R.sub.2是较低的烷基,可选择取代的
苯基-较低的烷基,羧基-较低的烷基或功能修饰的羧基-较低的烷基,它们与醛、
酮或
碳酸的缩合产物以及它们的N-
氧化物,这些化合物是有价值的(心脏选择性)β-受体阻滞剂和/或(心脏选择性)β-受体激动剂。