Method for producting betamimetics

摘要

The invention relates to a method for producing betamimetics of formula (1), wherein in which n represents 1 or 2; R1 represents hydrogen, halogen, C1-4-alkyl or O-C1-4-alkyl; R2 represents hydrogen, halogen, C1-4-alkyl or O-C1-4-alkyl and; R3 represents hydrogen, C1-4-alkyl, OH, halogen, O-C1-4-alkyl, O-C1-4-alkylene-COOH or O-C1-4-alkyl-lene-COO-C1-4-alkyl.