The conformational properties of bipyridine cardiotonics were investigated by means of quantum chemical (AM1(Austin Model 1)) calculations. The calculations for the tautomeric and ionic structures of 3, 4'-dipyridin-6(1H)-one (1), the basic structure for bipyridine cardiotonics, showed that the equilibrium conformations in the ionic structures are more planar than those in the neutral structures and that the rotational barrier of the cationic pyridone structure is characteristically higher compared to those of the pyridinol tautomer and 1'-hydro-3, 4'-bipyridinium cation. The difference in conformation between the well known cardiotonics, amrinone and milrinone, is more distinctive in the cationic structure, which is considered to be the usual structure in biological environments, than in the neutral structures.
通过量子
化学(
AM1(奥斯汀模型 1))计算研究了双
吡啶类强心剂的构象特性。对双
吡啶类强心剂的基本结构--3,4'-二
吡啶-6(1H)-酮(1)的同分异构体和离子结构的计算表明,离子结构的平衡构象比中性结构的平衡构象更平面,阳离子
吡啶酮结构的旋转障碍比
吡啶醇同分异构体和 1'-氢-3,4'-联
吡啶阳离子的旋转障碍高。众所周知的强心剂
氨力农和
米力农的构象差异在阳离子结构中比在中性结构中更为明显,而阳离子结构被认为是
生物环境中的常见结构。