This invention provides new compounds of formula I, ##STR1## wherein R is lower alkyl or cycloalkyl of 3 to 7 carbon atoms; cycloalkyl of 3 to 7 carbon atoms substituted by alkyl of 1 to 4 carbon atoms; .alpha.-dialkylpropinyl or .alpha.-dialkylallyl of 5 to 9 carbon atoms; hydroxyalkyl of 2 to 7 carbon atoms, the hydroxy group thereof being separated by at least two carbon atoms from the nitrogen atom to which R is bound; phenethyl; phenethyl substituted by halogen, alkyl or alkoxy of 1 to 4 carbon atoms; or adamantyl, R.sub.1 is hydrogen, halogen, alkyl or alkoxy of 1 to 4 carbon atoms, trifluoromethyl in the 5, 6 or 7 position, or a nitro or A--NH-- group in the 4 or 5 position, wherein A is formyl or alkanoyl of 2 to 4 carbon atoms, and R.sub.2 is hydrogen, or, when R.sub.1 is alkyl of 1 to 4 carbon atoms, also alkyl of 1 to 4 carbon atoms, or, when R.sub.1 is alkoxy of 1 to 4 carbon atoms, also alkoxy of 1 to 4 carbon atoms, With the general proviso that the 8 position of the isoquinoline ring is unsubstituted, and any halogen substituent which may present in the 3 or 4 position is other than fluorine, Useful as .beta.-blocking agents with metabolic effects.
本发明提供了式I的新化合物,其中R是3至7个碳原子的低级烷基或环烷基; 3至7个碳原子的环烷基,其被1至4个碳原子的烷基取代; 5至9个碳原子的α-二烷基
丙炔基或α-二烷基烯丙基; 2至7个碳原子的羟基烷基,其中羟基与R结合的氮原子至少相隔两个碳原子; 苯乙基; 被卤素、1至4个碳原子的烷基或烷氧基取代的苯乙基; 或
金刚烷基,R1是氢、卤素、1至4个碳原子的烷基或烷氧基、5、6或7位上的三
氟甲基,或4或5位上的硝基或A-NH-基,其中A是2至4个碳原子的甲酰基或脂肪酰基,R2是氢,或当R1是1至4个碳原子的烷基时,也是1至4个碳原子的烷基,或当R1是1至4个碳原子的烷氧基时,也是1至4个碳原子的烷氧基,一般而言,
异喹啉环的8位未被取代,任何可能存在于3或4位的卤素取代基均不是
氟,可用作具有代谢作用的β-阻滞剂。