PROCESS FOR THE PREPARATION OF BETAMIMETIC BENZOXAZINONE DERIVATIVES

摘要

The invention relates to a process for the manufacturing of organic compounds useful for treatment and prevention of respiratory diseases of general Formula (1) and salts thereof, wherein, R¹ and R² each independently mean H, halogen or C_1-4-alkyl or R¹ and R² are together have the meaning of C_1-6-alkylene; and R³ denotes H, Halogen, OH, C_1-4-alkyl or O-C_1-4-alkyl.