Imidazo(1,2-a)pyridines. III. Synthesis and Bradycardic Activity of New 5-Imidazo(1,2-a)pyridin-6-ylpyridine Derivatives.
作者:Motosuke YAMANAKA、Shinji SUDA、Yasuhiro KABASAWA、Takanori KAWAMURA、Toshiaki OGAWA、Kouhei SAWADA、Hideto OHHARA
DOI:10.1248/cpb.40.1486
日期:——
Structural modification of the cardiotonic agent, loprinone (E-1020, 1), suggested by data that it has a less positive chronotropic effect than milrinone (15), led us to find novel bradycardic agents that were structurally different from homoveratry amine derivatives. Alkyl-oxy, -thio, and -amino derivatives at the 2-position of the pyridine ring of 1 produced bradycardic activity without a significant effect on blood pressure and myocardial contractility. Aryloxy analogues also decreased heart rate, and members with an electron-withdrawing group at the ortho position of the phenyl ring showed higher activity. Replacement of the imidazo[1, 2-a]pyridine with pyridine resulted in diminished activity. The mechanism of bradycardic activity of these compounds seems to be direct action on the sinus node.
基于强心药左普利酮(E-1020,1)的数据提示其正性变时效应较米力农(15)弱,我们致力于寻找不同于高藜芦胺衍生物的新型减缓心率药物。在1的吡啶环2-位引入烷氧基、硫醚基和氨基衍生物可产生减缓心率活性,而对血压和心肌收缩力影响不大。芳氧基类似物也能降低心率,其在苯环上邻位带有吸电子基团的成员显示出更高的活性。将咪唑并[1, 2-a]吡啶替换为吡啶后,活性减弱。这些化合物减缓心率的机制似乎是直接作用于窦房结。