Structure-activity relationships of 8-styrylxanthines as A2-selective adenosine antagonists
作者:Kenneth A. Jacobson、Carola Gallo-Rodriguez、Neli Melman、Bilha Fischer、Michel Maillard、Andrew van Bergen、Philip J. M. van Galen、Yishai Karton
DOI:10.1021/jm00062a005
日期:1993.5
7-alkylxanthines was synthesized as potential A2-selective adenosine receptor antagonists, and the potency at rat brain A1- and A2-receptors was studied in radioligand binding experiments. At the xanthine 7-position, only small hydrophobic substituents were tolerated in receptor binding. 7-Methyl analogues were roughly 1 order of magnitude more selective for A2 versus A1 receptors than the corresponding 7-H analogues
合成了一系列取代的1,3,7-烷基黄嘌呤的8-苯乙烯基衍生物作为潜在的A2选择性腺苷受体拮抗剂,并在放射性配体结合实验中研究了对大鼠脑A1和A2受体的效价。在黄嘌呤7位上,受体结合中仅容忍小的疏水取代基。7-甲基类似物对A2和A1受体的选择性比相应的7-H类似物高大约1个数量级。1,3-二甲基黄嘌呤衍生物比相应的1,3-二烯丙基,二乙基或二丙基衍生物倾向于对A2-受体更具选择性。在3-(单取代)和3,5-(二取代)位置上苯环的取代是有利的。1,3,7-三甲基-8-(3-氯苯乙烯基)黄嘌呤是中等效力的(Ki vs [3H] CGS 21680为54 nM)和高度A2选择性(520倍)腺苷拮抗剂。1,3,7-三甲基-8-[(3-羧基-1-氧丙基)氨基]苯乙烯基]黄嘌呤具有很高的A2选择性(250倍),并且具有更高的水溶性(最大19 mM)。1,3-二丙基-7-甲基-8-(3,5-二甲氧基苯乙烯基)黄嘌呤是有效的(Ki