A compound of the formula ##STR1## in which R.sub.1 denotes optionally substituted lower akyl which is optionally branched at the linking carbon atom, R.sub.2 represents hydrogen or lower alkanoyl and R.sub.3 is a group of the formula --R.sub.3.sup.a -(R.sub.3.sup.b).sub.n -- (Ia), in which R.sub.3.sup.1 represents the radical of the formula --N(R.sub.4)-- or --O-- and R.sub.4 represents hydrogen or lower alkyl, R.sub.3.sup.b denotes the radical of the formula --CH.sub.2 -- or, if R.sub.3.sup.a represents --N(R.sub.4)--, denotes the radical of the formula --C(.dbd.O)-- and n represents nought or 1, and a group of the formula Ia, in which n represents 1, can be linked to the carbonyl group of the carbamoyl grouping either via the group R.sub.3.sup.a or the group R.sub.3.sup.b, or acid addition salts thereof, which can be used pharmaceutically can be used as beta-receptor blocking agents for the treatment of disorders in the cardiac rhythm and coronary heart diseases. These compounds also possess a cardio-stimulating action; some of them also display alpha-receptor-blocking properties.
该化合物的
化学式为##STR1## 其中R.sub.1表示可选择的取代较低的烷基,该烷基在连接碳原子处可选择地分支,R.sub.2表示氢或较低的脂肪酰基,而R.sub.3是公式--R.sub.3.sup.a-(R.sub.3.sup.b).sub.n--(Ia)的基团,其中R.sub.3.sup.1表示公式--N(R.sub.4)--或--O--的基团,而R.sub.4表示氢或较低的烷基,R.sub.3.sup.b表示公式--CH.sub.2--的基团,或者如果R.sub.3.sup.a表示--N(R.sub.4)--,则表示公式--C(.dbd.O)--的基团,n表示零或1,其中n表示1的Ia基团可以通过R.sub.3.sup.a或R.sub.3.sup.b基团与碳酰胺基团的羰基结合,或其酸加成盐,在药物学上可用作β受体阻滞剂,用于治疗心律失常和冠心病等疾病。这些化合物还具有心脏刺激作用,其中一些还具有α受体阻滞特性。