the aS and aR isomers of compound 1 do not interconvert in solution, we investigated how biological activity is influenced by axial chirality and conformational equilibrium. The aS and aR atropisomers of 1 were equally active in the PI3Kδ assay. Conversely, the introduction of a methyl group at the methylene hinge connecting the 6-amino-9H-purin-9-yl pendant to the quinazolin-4(3H)-one nucleus of both
IC87114 [化合物1((2-((6-
氨基-9 H-
嘌呤-9-基)甲基)-5-甲基-3-(邻
甲苯基)
喹唑啉-4(3 H)-one)]为对δ亚型具有选择性的强效
PI3K
抑制剂。如分子模型计算所预测的那样,围绕将
喹唑啉-4(3H)-一个核连接至邻
甲苯基的键的旋转在空间上受阻,这导致具有轴向手性的可分离构象异构体(即阻转异构体)。验证化合物1的a S和R异构体在溶液中不相互转化后,我们研究了轴向手性和构象平衡如何影响
生物活性。将一个小号和R阻转异构体1在
PI3Kδ分析中具有同等活性。相反,在亚甲基铰链引入一个甲基的连接6-
氨基-9- ħ -
嘌呤-9-基侧挂于
喹唑啉-4(3 H ^) -酮两者的核上的小号和- [R的异构体1有对抑制活性的关键作用,表明对离开中心亚甲基的两个键可及的构象空间的调节大大影响了化合物1类似物与
PI3Kδ酶的结合。