Design, Synthesis, and Pharmacological Profile of Novel Fused Pyrazolo[4,3-<i>d</i>]pyridine and Pyrazolo[3,4-<i>b</i>][1,8]naphthyridine Isosteres: A New Class of Potent and Selective Acetylcholinesterase Inhibitors
作者:Eliezer J. Barreiro、Celso A. Camara、Hugo Verli、Leonora Brazil-Más、Newton G. Castro、Wagner M. Cintra、Yasco Aracava、Carlos R. Rodrigues、Carlos A. M. Fraga
DOI:10.1021/jm020391n
日期:2003.3.1
tacrine (THA) analogues (7-9, 12), containing the azaheterocyclic pyrazolo[4,3-d]pyridine or pyrazolo[3,4-b][1,8]naphthyridine systems as isosteres of the quinoline ring of THA, has been synthesized. The compounds were tested in rat brain cholinesterases using Ellman's method, and all were fully efficacious in inhibiting the enzymes. Compounds 9 and 12b were the most potent against acetylcholinesterase
一个新的他克林(THA)类似物家族(7-9,12),包含氮杂杂环吡唑并[4,3-d]吡啶或吡唑并[3,4-b] [1,8]萘啶系统,是喹啉的等排体THA环已合成。使用Ellman方法在大鼠脑胆碱酯酶中测试了这些化合物,所有这些化合物均能有效抑制该酶。化合物9和12b对乙酰胆碱酯酶(AChE)最有效,显示IC(50)为6.0和6.4 microM,对大鼠脑丁酰胆碱酯酶的活性较低,分别显示选择性指数5.3和20.9。还使用培养的大鼠皮层细胞在体外测试了化合物7-9和12的急性神经毒性。化合物7和8没有明显毒性;9在500 microM时有毒,但在100 microM时无毒。萘啶衍生物12a和12b表现出明显的浓度依赖性神经毒性,能够杀死500 microM的大多数细胞。使用来自加州鱼雷的AChE的X射线晶体结构的分子动力学模拟来解释这些新的THA等位基因的可能结合方式。