A compound of the formula ##STR1## in which R.sub.1 denotes optionally substituted lower alkyl 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.a 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.
式为##
STR1##的化合物,其中R.sub.1表示可选择地取代的较低烷基,该烷基在连接
碳原子处可选择地为支链,R.sub.2代表
氢或较低的烷酰基,R.sub.3是具有式--R.sub.3.sup.a --(R.sub.3.sup.b).sub.n --(Ia)的基团,其中R.sub.3.sup.a表示式--N(R.sub.4)--或--O--的基团,R.sub.4表示
氢或较低烷基,R.sub.3.sup.b表示式--CH.sub.2--的基团,或者,如果R.sub.3.sup.a表示--N(R.sub.4)--,则表示式--C(.dbd.O)--的基团,n表示零或1,和式Ia的基团,其中n表示1,可以通过基团R.sub.3.sup.a或基团R.sub.3.sup.b连接到羰基的羰基基团,或其酸盐加合物,可用于药物学上用作β-受体阻滞剂,用于治疗心律失常和
冠心病的疾病。这些化合物还具有心脏刺激作用;其中一些化合物还显示α-受体阻滞性质。