Betamimetics with a prolonged duration of activity, processes for preparing them, and their use as pharmaceutical compositions

摘要

A compound of formula 1 wherein: R¹ is C₁-C₄-alkyl; R² is C₁-C₄-alkyl; and R³ is C₁-C₄-alkyl or phenyl, each optionally mono- or polysubstituted, or R² and R³ together are -CH₂-CH₂- or -CH₂-CH₂-CH₂-, or the corresponding acid addition salt with a pharmacologically acceptable acid, processes for preparing such compounds, pharmaceutical compositions containing such compounds, and their use in the treatment of inflammatory and obstructive respiratory diseases.