beta-adrenergic antagonist activity. This paper describes the synthesis of each of the four possible stereoisomers of 3 and provides clear evidence for the different pharmacological profile of each of the stereoisomers. The RA,SB isomer 3a has an overall profile slightly better than the complete mixture; the other three isomers all show reduced activity as vasodilators and/or beta-adrenergic antagonists.
6- [4- [3-[[2-羟基-3- [4- [2-(环丙基甲氧基)乙基]苯氧基]丙基]
氨基]丙酰胺基]苯基] -5-甲基-4,5-二氢-3(由于结构中包含两个不对称中心,2H)-
哒嗪酮(3)由四种立体异构体(即两个外消旋体)的混合物组成。这两个外消旋物的等摩尔混合物显示出血管舒张作用和β-
肾上腺素能拮抗剂活性的新型结合。本文描述了3种四种可能的立体异构体的合成,并为每种立体异构体的不同药理特性提供了明确的证据。RA,SB异构体3a的总体特征略好于完整混合物;其他三种异构体均显示出降低的血管扩张剂和/或β-
肾上腺素能拮抗剂活性。