Novel 1,3-Disubstituted 8-(1-benzyl-1<i>H</i>-pyrazol-4-yl) Xanthines: High Affinity and Selective A<sub>2B</sub> Adenosine Receptor Antagonists
作者:Rao V. Kalla、Elfatih Elzein、Thao Perry、Xiaofen Li、Venkata Palle、Vaibhav Varkhedkar、Arthur Gimbel、Tennig Maa、Dewan Zeng、Jeff Zablocki
DOI:10.1021/jm051268+
日期:2006.6.1
analogues, the smaller 1,3-dialkyl groups (methyl and ethyl) increased the A(2B) AdoR binding selectivity of the xanthine derivatives while retaining the affinity. However, the larger 1,3-dialkyl groups (isobutyl and butyl) resulted in a decrease in both A(2B) AdoR affinity and selectivity. This final SAR optimization led to the discovery of 1,3-dimethyl derivative 60, 8-(1-(3-(trifluoromethyl) benzyl)-1H-pyrazol-4-yl)-1
腺苷已被建议在哮喘患者中诱导支气管高反应性,据信这是A(2B)腺苷受体(AdoR)介导的途径。我们假设选择性的高亲和力A(2B)AdoR拮抗剂可能在哮喘的治疗中提供治疗益处。为了确定一种高亲和力,选择性的A(2B)AdoR拮抗剂,我们合成了8-(C-4-吡唑基)黄嘌呤。化合物22 8-(1H-吡唑-4-基)-1,3-二丙基黄嘌呤是N-1未取代的吡唑衍生物,对A(2B)具有良好的结合亲和力(K(i)= 9 nM) AdoR,但与A(1)AdoR相比只有2倍的选择性。在N-1-吡唑的22位引入苄基导致19,其具有中等选择性。SAR研究的最初重点是制备19的取代苄基衍生物,因为相对于19,相应的苯基,苯乙基和苯丙基衍生物显示出A(2B)AdoR亲和力和选择性降低。苯环上的首选取代如在33和36中分别在19中,C 1包含一个吸电子基团,特别是F或CF(3),在保持对A(2B)AdoR的亲和力的同时