Exploring the 2- and 5-positions of the pyrazolo[4,3-d]pyrimidin-7-amino scaffold to target human A1 and A2A adenosine receptors
作者:Lucia Squarcialupi、Matteo Falsini、Daniela Catarzi、Flavia Varano、Marco Betti、Katia Varani、Fabrizio Vincenzi、Diego Dal Ben、Catia Lambertucci、Rosaria Volpini、Vittoria Colotta
DOI:10.1016/j.bmc.2016.04.048
日期:2016.6
receptors (cAMP assays). Its 2-(2-hydroxybenzyl) analog 26 also showed a high affinity for the hA2A AR (Ki=5.26nM) and was 22-fold selective versus the hA1 subtype. Molecular docking investigations performed at the hA2A AR crystal structure and at a homology model of the hA1 AR allowed us to represent the hypothetical binding mode of our derivatives and to rationalize the observed SARs.
合成了一系列新的7-氨基吡唑并[4,3-d]嘧啶衍生物(1-31),以评估2位和5位的一些结构修饰,旨在改变对人(h)A2A腺苷受体( AR)或hA2A和hA1 ARs。活性最高的化合物是那些在位置5处带有2-呋喃基或5-甲基呋喃-2-基的化合物,在位置2处带有苄基或取代的苄基,其中一些衍生物(22-31)具有纳摩尔浓度对hA2A AR的亲和力(Ki = 3.62-57nM),对hA1 AR的亲和力略低,因此显示出相对于hA1选择性而言,hA2A的程度不同(3-22倍)。尤其是,2-(2-甲氧基苄基)-5-(5-甲基呋喃-2-基)衍生物25具有最高的hA2A和hA1 AR亲和力(Ki = 3.62nM和18nM,并在这两个受体上均表现出强大的拮抗作用(cAMP分析)。它的2-(2-羟基苄基)类似物26对hA2A AR也有很高的亲和力(Ki = 5.26nM),相对于hA1亚型具有22倍的选择性。在hA2A