| abstract |
Compounds of formula (Ia) as potent, beta<SUB>1</SUB>-specific beta blockers with a short duration of action in the systemic circulation, wherein R is 3',4'-dimethoxyphenyl, R<SUP>1 </SUP>is hydrogen, and R<SUP>2 </SUP>is selected from methyl, ethyl, propyl, isobutyl and isopropyl; or R is 3',4'-dimethoxyphenyl, R<SUP>1 </SUP>is selected from fluorine, chlorine and bromine, and R<SUP>2 </SUP>is selected from methyl, ethyl, propyl, isopropyl, isobutyl and cyclopropylmethyl; of R is 4'-methoxyphenoxy, R<SUP>1 </SUP>is selected from hydrogen, fluorine, chlorine and bromine, and R<SUP>2 </SUP>is selected from methyl, ethyl, propyl, isopropyl, isobutyl and cyclopropylmethyl; or R is 3',4'-dimethoxyphenyl, R<SUB>1 </SUB>is cyano, and R<SUP>2 </SUP>is cyclopropylmethyl; or R is 4'-methoxyphenoxy, R<SUP>1 </SUP>is cyano, and R<SUP>2 </SUP>is isobutyl; and physiologically acceptable hydrolysable derivatives thereof having the hydroxy group in the 2-position of the 3-aminopropoxy side chain in esterified form, in their racemic and optically active forms, and their pharmaceutically acceptable acid addition salts. |