Racemic and optically active compounds of the formula ##STR1## wherein R.sub.1 is hydrogen, fluorine, chlorine, bromine, iodine or cyano, R.sub.2 is fluorine, trifluoromethyl, nitro or cyano, and R.sub.3 is alkyl of 3 to 5 carbon atoms, hydroxy(alkyl of 3 to 5 carbon atoms), cycloalkyl of 3 to 5 carbon atoms, 1-(3,4-methylenedioxy-phenyl)-2-propyl or 1-(p-hydroxy-phenyl)-2-propyl, And non-toxic, pharmacologically acceptable acid addition salts thereof; the compounds as well as their salts are useful as analgesics, uterospasmolytics, bronchospasmolytics and antispastics for the skeletal musculature, and especially as .beta..sub.2 -receptor mimetics and .beta..sub.1 -receptor blockers.
具有以下结构的光学活性和消旋化合物:其中R.sub.1为氢、
氟、
氯、
溴、
碘或
氰基,R.sub.2为
氟、三
氟甲基、硝基或
氰基,R.sub.3为3至5个碳原子的烷基、3至5个碳原子的羟基(烷基)、3至5个碳原子的环烷基、1-(3,4-亚甲二氧基-苯基)-2-丙基或1-(对羟基苯基)-2-丙基,以及其非毒性、药理学上可接受的酸加合物盐;这些化合物及其盐可用作
镇痛药、子宫平滑肌松弛剂、支气管平滑肌松弛剂和骨骼肌肉的抗痉挛剂,尤其作为β2-受体类似物和β1-受体阻滞剂。