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 alklyl, 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.-receptor blocking agents, and/or (cardioselective) .beta.-receptor-stimulants.
式子为##STR1##的
杂环化合物,其中Het表示可选取代的
吡啶并嗪基、
嘧啶基、
吡嗪基或取代的
吡啶基,R.sub.1为氢或甲基,R.sub.2为较低的烷基、可选取代的苯基-较低烷基、羧基-较低烷基或功能改性的羧基-较低烷基,它们与醛、酮或
碳酸的缩合产物以及它们的N-氧化物是有价值的(心脏选择性).beta.-受体阻滞剂和/或(心脏选择性).beta.-受体刺激剂。