scaffolds were less potent. Crucially, these studies revealed a very constrained structure-activity relationship at the 2-position of the benzopyranone and pyrimido[2,1-a]isoquinolin-4-one pharmacophore, with only a 2-morpholino or 2-(2'-methylmorpholino) group being tolerated at this position. More detailed biological studies conducted with the most potent inhibitor NU7163 (48; IC(50) = 0.19 microM) demonstrated
合成了各种各样的chromen-2-one,chromen-4-one和pyrimidoisoquinolin-4-one衍
生物,并评估了其对DNA修复酶DNA依赖性蛋白激酶(DNA-PK)的抑制活性,目的是阐明效价和激酶选择性的构效关系。DNA-PK抑制活性在评估的一系列化合物(IC(50)值范围从0.19到> 10 microM)上有很大差异,其中7,8-苯并
铬基-4-酮和
嘧啶基[2,1]表现出优异的活性。 -a] isoquinolin-4-one模板。相比之下,基于苯并色素-2-酮(
香豆素)或2-芳基-7,8-苯并色素-4-酮(
黄酮)支架的
抑制剂效力较低。至关重要的是,这些研究揭示了在苯并
吡喃酮和
嘧啶基2位上的结构活性关系非常受约束[2,1-a]
异喹啉-4-酮药效基团,在此位置仅可耐受2-吗啉代或2-(2'-甲基吗啉代)基团。用最有效的
抑制剂NU7163(48; IC(50)= 0