Synthesis and Biological Evaluation of the Enantiomers of the Potent and Selective A<sub>1</sub>-Adenosine Antagonist 1,3-Dipropyl-8-[2-(5,6-epoxynorbonyl)]- xanthine
作者:Jürg R. Pfister、Luiz Belardinelli、Gavin Lee、Robert T. Lum、Peter Milner、William C. Stanley、Joel Linden、Stephen P. Baker、George Schreiner
DOI:10.1021/jm970013w
日期:1997.6.1
rearrangement. The binding affinities of the enantiomers 8 and 12 and the racemate 4 at guinea pig, rat, and cloned human A1- and A2a-adenosine receptor subtypes were determined. The S-enantiomer 12 (CVT-124) appears to be one of the more potent and clearly the most A1-selective antagonist reported to date, with K1 values of 0.67 and 0.45 nM, respectively, at the rat and cloned human A1-receptors and with 1800-fold
有效和高度选择性的外消旋A1-腺苷拮抗剂1,3-二丙基-8- [2-(5,6-环氧降冰片基)]黄嘌呤(ENX,4)的单个对映异构体8和12是利用不对称Diels-Alder环加成反应合成的用于降冰片烷部分的构建。通过X-射线结晶4-溴苯甲酸酯14来确定12的绝对构型,所述4-溴苯甲酸酯14是由桥连的仲醇13衍生的。后者是通过酸催化的分子内重排从12中获得的。测定了对映体8和12以及外消旋体4在豚鼠,大鼠和克隆的人A1-和A2a-腺苷受体亚型的结合亲和力。S-对映体12(CVT-124)似乎是迄今为止报道的更有效,最明显的A1选择性拮抗剂之一,K1值分别为0.67和0.45 nM,在大鼠和克隆的人A1受体中具有1800倍(大鼠)和2400倍(人类)亚型选择性。两种对映异构体均通过静脉内给药于含盐的大鼠,通过肾脏A1-腺苷受体的拮抗作用诱导利尿作用。