The present invention relates to a process for preparing betamimetics of formula1,wherein n denotes 1 or 2; R1denotes hydrogen, halogen, C1-4-alkyl or O-C1-4-alkyl; R2denotes hydrogen, halogen, C1-4-alkyl or O-C1-4-alkyl; R3denotes hydrogen, C1-4-alkyl, OH, halogen, O-C1-4-alkyl, O- C1-4-alkylene- COOH, O-C1-4-alkylene-COO-C1-4-alkyl.本發明係關於一種用於製備式1之β-擬態物的方法,其中n表示1或2;R1表示氫、鹵素、C1-4-烷基或O-C1-4-烷基;R2表示氫、鹵素、C1-4-烷基或O-C1-4-烷基;R3表示氫、C1-4-烷基、OH、鹵素、O-C1-4-烷基、O-C1-4-伸烷基-、COOH、O-C1-4-伸烷基-COO-C1-4-烷基。