Compounds of the general formula (I): ##STR1## in which one or more substituents R.sub.1 may be present and in which: R.sub.1 represents a halogen atom, preferably fluorine or chlorine, or a trifluoromethyl group or a group --NR.sub.5 R.sub.6 in which R.sub.5 and R.sub.6 which may be the same or different represent a hydrogen atom, or an alkyl group containing from 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms or an acyl group, preferably the residue of a C.sub.1 -C.sub.6 alkanoic acid; X represents a straight or branched chain alkyl group containing 2 to 6 carbon atoms; and R.sub.2 and R.sub.3 which may be the same or different each represent a hydrogen atom or an alkyl group containing from 1 to 4 carbon atoms, preferably a methyl group; and R.sub.4 represents a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms, are provided together with processes for the production thereof. They have a .beta..sub.2 -stimulant activity.
通式(I)的化合物:##STR1## 其中可以存在一个或多个取代基R.sub.1,其中:R.sub.1表示卤素原子,优选
氟或
氯,或三
氟甲基基团或--NR.sub.5 R.sub.6基团,其中R.sub.5和R.sub.6可以相同或不同,表示氢原子,或含有1至6个碳原子的烷基基团,优选1至4个碳原子,或酰基基团,优选C.sub.1-C.sub.6
脂肪酸的残基;X表示直链或支链烷基基团,含有2至6个碳原子;R.sub.2和R.sub.3可以相同或不同,每个表示氢原子或含有1至4个碳原子的烷基基团,优选甲基基团;R.sub.4表示氢原子或含有1至4个碳原子的烷基基团,提供了它们的制备方法。它们具有β2-受体激动剂活性。