2-Phenylimidazo[2,1-i]purin-5-ones Structure–Activity relationships and characterization of potent and selective inverse agonists at Human A3 adenosine receptors
作者:V Ozola
DOI:10.1016/s0968-0896(02)00456-x
日期:2003.2.6
affinity but increased A(1) affinity leading to potent A(1)-selective AR antagonists. The most potent A(1) antagonist of the present series was (S)-8-ethyl-2-phenyl-4-propyl-4,5,7,8-tetrahydro-1H-imidazo[2,1-i]purin-5-one (S-3) exhibiting a K(i) value of 7.4 nM at rat A(1) ARs and greater than 100-fold selectivity versus rat A(2A) and human A(3) ARs. At human A(1) ARs 2-phenylimidazo[2,1-i]purin-5-ones
研究了 2-苯基-咪唑并 [2,1-i]purin-5-ones 作为人类 A(3) 腺苷受体 (ARs) 的配体的构效关系。发现导致手性化合物的 4-甲基-2-苯基-咪唑嘌呤酮的咪唑啉环 8 位的乙基可将人类 A(3) AR 的亲和力提高数千倍。N4 处的丙基取代而不是甲基降低了 A(3) 亲和力,但增加了 A(1) 亲和力,从而产生了有效的 A(1) 选择性 AR 拮抗剂。本系列最有效的 A(1) 拮抗剂是 (S)-8-乙基-2-苯基-4-丙基-4,5,7,8-四氢-1H-咪唑并[2,1-i]嘌呤-5-one (S-3) 在大鼠 A(1) ARs 上表现出 7.4 nM 的 K(i) 值,与大鼠 A(2A) 和人类 A(3) ARs 相比,选择性大于 100 倍。在人类 A(1) ARs 2-苯基咪唑 [2, 1-i]purin-5-ones 通常效力较低,因此 A(1) 选择性较低(S-3:K(i)=98