Fluorinated indazoles as novel selective inhibitors of nitric oxide synthase (NOS): Synthesis and biological evaluation
作者:Rosa M. Claramunt、Concepción López、Carlos Pérez-Medina、Marta Pérez-Torralba、José Elguero、Germaine Escames、Darío Acuña-Castroviejo
DOI:10.1016/j.bmc.2009.07.067
日期:2009.9.1
In order to find new compounds with neuroprotective activity and NOS-I/NOS-II selectivity, we have designed, synthesized, and characterized 14 new NOS inhibitors with an indazole structure. The first group corresponds to 4,5,6,7-tetrahydroindazoles (4–8), the second to the N-methyl derivatives (9–12) of 7-nitro-1H-indazole (1) and 3-bromo-7-nitro-1H-indazole (2), and the latter to 4,5,6,7-tetrafluoroindazoles
为了找到具有神经保护活性和NOS-I / NOS-II选择性的新化合物,我们设计,合成和表征了14种具有吲唑结构的新型NOS抑制剂。第一组对应于4,5,6,7-四氢(4 - 8),第二至Ñ -甲基衍生物(9 - 12)的7-硝基1 ħ -吲唑(1)和3-溴7-硝基-1 H-吲唑(2),后者为4,5,6,7-四氟吲唑(13 – 17)。化合物13(4,5,6,7-四氟-3-甲基-1 H-吲唑)抑制NOS-I达63%,抑制NOS-II 83%。有趣的是,化合物16(4,5,6,7-四氟-3-全氟苯基-1 H-吲唑)抑制NOS-II活性达80%,但不影响NOS-I活性。这些新型吲唑之间的结构比较进一步证明了芳香族吲唑骨架对于NOS抑制的重要性,并表明1和2的大基团或N-甲基化减弱了它们对NOS活性的影响。芳环的氟化增加了抑制效力和NOS-II选择性,这表明这是NOS选择性抑制剂的一种有前途的策略。