containing a quaternary methylene-amino substituent at the C-2 position of the benzimidazole. Geminal dimethyl analogs at the methylene-amino substituent were typically more potent than mono-methyl derivatives in both intrinsic and cellular assays. Smaller cycloalkanes such as cyclopropyl or cyclobutyl were tolerated at the quaternary carbon while larger rings were detrimental to potency. In vivo efficacy
聚(
ADP-
核糖)聚合酶(PARP)在各种细胞功能(包括DNA修复和RNA转录控制)中起重要作用。在许多动物肿瘤模型中,PARP
抑制剂已被证明可增强细胞毒剂或放射的作用。利用其中苯甲酰胺形成关键的分子内氢键以与酶进行最佳相互作用的
苯并咪唑羧酰胺支架,我们确定了一系列新型的PARP
抑制剂,在
苯并咪唑的C-2位上含有季亚甲基-
氨基取代基。在固有和
细胞分析中,亚甲基-
氨基取代基上的双甲基二甲基类似物通常比单甲基衍
生物更有效。较小的环
烷烃(例如环丙基或
环丁基)在季碳原子上具有耐受性,而较大的环则不利于效能。针对两个优化的类似物,描述了B16F10小鼠侧腹
黑色素瘤模型与
替莫唑胺(TMZ)结合的体内功效数据。