Dihydropyrimidine calcium channel blockers. 3. 3-Carbamoyl-4-aryl-1,2,3,4-tetrahydro-6-methyl-5-pyrimidinecarboxylic acid esters as orally effective antihypertensive agents
作者:Karnail S. Atwal、Brian N. Swanson、Steven E. Unger、David M. Floyd、Suzanne Moreland、Anders Hedberg、Brian C. O'Reilly
DOI:10.1021/jm00106a048
日期:1991.2
18 by treatment with (R)-alpha-methylbenzylamine. Our results demonstrate that the active R-(-)-enantiomer 20a of 7 is both more potent and longer acting than nifedipine (1) as an antihypertensive agent in the SHR. The in vivo potency and duration of 20a is comparable to the long-acting dihydropyridine amlodipine. The superior oral antihypertensive activity of 20a compared to that of previously described
为了解释中等活性(IC50 = 3.2 microM)二氢嘧啶钙通道阻滞剂5的有效降压活性,我们在大鼠中进行了药物代谢研究,发现5被代谢为化合物6-10。已发现其中两种代谢物6(IC50 = 16 nM)和7(IC50 = 12 nM)负责化合物5的降压活性。体内6到7的潜在代谢使我们对研究与以下物质有关的化合物的兴趣减弱了6.结构活性研究旨在鉴定其他7的芳基取代的类似物,在体内具有可比的潜力,导致17g,j,p,尽管这些化合物在体外的效力不及7。为了研究绝对立体化学对效能的影响,我们通过由(R)-α-甲基苄基胺处理从18制备的非对映异构脲19a,b拆分了7。我们的结果表明,与硝苯地平(1)作为SHR中的降压药相比,活性7的活性R-(-)-对映体20a既有效,又作用更长。20a的体内效力和持续时间与长效二氢吡啶氨氯地平相当。与先前描述的氨基甲酸酯2(R2 = COOEt)相比,20a的口服