New 4-(2-alkylamino-1-hydroxyethyl)-3-alkoxy-benzene-1,2-diol derivatives, are beta-mimetics having a long duration of action, useful e.g. for treating asthma, chronic obstructive pulmonary disease or arrhythmia

摘要

4-(2-(Tertiary alkylamino)-1-hydroxyethyl)-3-alkoxy-benzene-1,2-diol derivatives (I) are new. Phenylethanolamine derivatives of formula (I), including individual optically isomers, enantiomer mixtures and racemates, and their acid addition salts are new. R1, R2 = 1-4C alkyl; R3 = 1-4C alkyl or mono- or polysubstituted phenyl; or R2 + R3 = (CH2)2 or (CH2)3.