Novel 1,2,3,4-tetrahydroisoquinoline derivatives bearing directly a cyclic amine at the 2-position were prepared and examined for their bradycardic activities in isolated right atria and in anesthetized rats. The structure–activity relationships (SAR) study revealed that the 2-(3-piperidyl)-1,2,3,4-tetrahydroisoquinoline skeleton is essential for the appearance of potent in vitro activity, and that the presence of at least one methoxy group at the 6- or 7-position of the 1,2,3,4-tetrahydroisoquinoline ring is important to exert potent in vitro activity. In vivo tests of selected compounds demonstrated that 2-(1-benzyl-3-piperidyl)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline (6c) exhibited potent bradycardic activity with negligible influence on mean blood pressure in rats, although its potency is a half of that of Zatebradine.
合成了直接在2位含有环胺的1,2,3,4-
四氢异喹啉衍
生物,并在分离的右心房和麻醉大鼠中检查其减心率活性。结构—活性关系(
SAR)研究表明,2-(3-
哌啶基)-1,2,3,4-
四氢异喹啉骨架对出现强效的体外活性是必不可少的,并且1,2,3,4-
四氢异喹啉环的6位或7位至少存在一个甲氧基团对发挥强效的体外活性也很重要。在对选定化合物的体内测试中,2-(1-苯基-3-
哌啶基)-
6,7-二甲氧基-1,2,3,4-四氢异喹啉(6c)显示出强效的减心率活性,同时对大鼠的平均动脉压影响微乎其微,尽管其效力仅为Zatebradine的一半。