A novel 5,7-dihydroxytetrahydroisoquinoline derivative having the formula: ##STR1## wherein R is trimethoxyphenyl, is prepared either by hydrolysis of a compound having the formula: ##STR2## wherein R.sup.1 is an organic acyl group and R is same as above, or by catalytic hydrogenation of a compound having the formula: ##STR3## wherein R.sup.3 is hydrogen or benzyl and R is same as above. The 5,7-dihydroxytetrahydroisoquinoline derivative (I) or a pharmaceutically acceptable acid addition salt thereof is useful as a bronchodilator.
一种新的5,7-二羟基
四氢异喹啉衍
生物,其
化学式为:##
STR1## 其中R为三
甲氧基苯基,可通过以下两种方法制备:将具有以下
化学式的化合物
水解:##
STR2## 其中R.sup.1为有机酰基,R与上述相同;或将具有以下
化学式的化合物催化
氢化:##
STR3## 其中R.sup.3为
氢或
苄基,R与上述相同。5,7-二羟基
四氢异喹啉衍
生物(I)或其药学上可接受的酸盐是一种有用的支气管扩张剂。