Synthesis, Rotamer Orientation, and Calcium Channel Modulation Activities of Alkyl and 2-Phenethyl 1,4-Dihydro-2,6-dimethyl-3-nitro-4-(3- or 6-substituted-2-pyridyl)-5-pyridinecarboxylates
作者:Nadeem Iqbal、Murthy R. Akula、Dean Vo、Wandikayi C. Matowe、Carol-Anne McEwen、Michael W. Wolowyk、Edward E. Knaus
DOI:10.1021/jm970529f
日期:1998.5.1
this rotamer orientation. In vitro calcium channel antagonist and agonist activities were determined using guinea pig ileum longitudinal smooth muscle (GPILSM) and guinea pig left atrium (GPLA) assays, respectively. Compounds having an i-Pr ester substituent acted as dual cardioselective calcium channel agonists (GPLA)/smooth muscle-selective calcium channel antagonists (GPILSM), except for the C-4 3-nitro-2-pyridyl
制备了一组外消旋的烷基和2-苯乙基的1,4-二氢-2,6-二甲基-3-硝基-4-(3-或6-取代的-2-吡啶基)-5-吡啶羧酸酯(13a-q)使用改良的Hantzsch反应,该反应涉及将3-或6-取代的2-吡啶甲醛(7a-j)与3-氨基巴豆酸烷基酯或2-苯乙基丁烯酸酯(11a-d)和硝基丙酮(12)缩合。核Overhauser(NOE)研究表明,溶液中存在大量的旋转异构体,无论取代基是位于3位还是6位,吡啶氮原子都位于1,4-二氢吡啶环上方。吡啶基氮自由电子对与适当定位的1,4-二氢吡啶NH部分之间的潜在H键相互作用可稳定该旋转异构体的取向。分别使用豚鼠回肠纵向平滑肌(GPILSM)和豚鼠左心房(GPLA)测定来确定体外钙通道拮抗剂和激动剂活性。具有i-Pr酯取代基的化合物可作为双重心脏选择性钙通道激动剂(GPLA)/平滑肌选择性钙通道拮抗剂(GPILSM),但对C-4 3-硝基-2-吡啶基化合物表现出拮抗作用的C-4