1,2,4-Triazolo[5,1-<i>i</i>]purine Derivatives as Highly Potent and Selective Human Adenosine A<sub>3</sub> Receptor Ligands
作者:Takashi Okamura、Yasuhisa Kurogi、Hiroshi Nishikawa、Kinji Hashimoto、Hiroshi Fujiwara、Yoshimitsu Nagao
DOI:10.1021/jm010570p
日期:2002.8.1
affinities at the A(2A) receptor. These investigations led to potent and selective human adenosine A(3) receptor ligands. The most potent A(3) receptor ligand (5-n-butyl-8-(4-methoxyphenyl)-3H-[1,2,4]triazolo[5,1-i]purine (27, K(i) = 0.18 nM) and the most selective A(3) receptor ligand against A(1), A(2A), and A(2B) receptors, (5-n-butyl-8-(4-n-propoxyphenyl)-3H-[1,2,4]triazolo[5,1-i]purine (29, >19
一系列的三唑并尿烷与人腺苷A(3)受体拮抗剂9-氯-2-(2-呋喃基)-5-[(苯乙酰基)氨基] [1,2,4]三唑并[1,5-] c]喹唑啉(MRS 1220,1)。在这项研究中,我们发现新颖的1,2,4-三唑并[5,1-i]嘌呤衍生物(2)显示人腺苷A(3)受体亲和力。该化合物分两步从5-氨基-4-氰基咪唑(33)中获得。亲和力是在放射性配体结合试验中确定的,用于克隆的人腺苷A(1),A(2A),A(2B)和A(3)受体。分析了结构-活性关系后,我们确定在5位的烷基长度与A(3)受体的亲和力之间存在温和的抛物线关系,并且在8位的苯基上取代基的长度与亲和力之间呈正相关在A(2A)受体上。这些研究导致有效和选择性的人类腺苷A(3)受体配体。最有效的A(3)受体配体(5-正丁基-8-(4-甲氧基苯基)-3H- [1,2,4]三唑并[5,1-i]嘌呤(27,K(i)= 0.18 nM)和针对A