Structure−Activity Relationships of 4-(Phenylethynyl)-6-phenyl-1,4- dihydropyridines as Highly Selective A<sub>3</sub> Adenosine Receptor Antagonists
作者:Ji-long Jiang、A. Michiel van Rhee、Louis Chang、Abraham Patchornik、Xiao-duo Ji、Patricia Evans、Neli Melman、Kenneth A. Jacobson
DOI:10.1021/jm970091j
日期:1997.8.1
(Trifluoromethyl)-, nitro-, and other benzyl esters substituted with electron-withdrawing groups were specific for A3 receptors with nanomolar Ki values and selectivity as high as 37000-fold. A functionalized congener bearing an [(aminoethyl)amino]carbonyl group was also prepared as an intermediate in the synthesis of biologically active conjugates.
4-(苯乙炔基)-6-苯基-1,4-二氢吡啶衍生物是人 A3 腺苷受体的选择性拮抗剂,与 [125I]AB-MECA (N6-(4-amino-3-碘苄基)-5'-(N-甲基氨基甲酰基)腺苷)在亚微摩尔范围内。在本研究中,综合探讨了二氢吡啶环不同位置(3-和5-酰基取代基、4-芳基取代基和1-甲基)的构效关系。利用1-乙氧基甲基和5-[2-(三甲基甲硅烷基)乙基]酯基团的联合保护,在5位形成游离羧酸,允许各种取代。确定新类似物对克隆人 A3 腺苷受体的选择性与大鼠脑 A1 和 A2A 受体上放射性配体的结合。腺苷受体的结构活性分析表明,4 位的吡啶基、呋喃基、苯并呋喃基和噻吩基最多只能对 A3 腺苷受体产生中等选择性。与4-苯乙烯基取代的二氢吡啶不同,4-苯乙炔基的环取代(例如4-硝基)没有提供增强的选择性。在二氢吡啶环的 3 位,酯对 A3 受体的选择性比密切相关的硫酯、酰胺和酮衍生物高得多。环状