Synthesis and biological evaluation of potential inhibitors of the cysteine proteases cruzain and rhodesain designed by molecular simplification
作者:Saulo Fehelberg Pinto Braga、Luan Carvalho Martins、Elany Barbosa da Silva、Policarpo Ademar Sales Júnior、Silvane Maria Fonseca Murta、Alvaro José Romanha、Wai Tuck Soh、Hans Brandstetter、Rafaela Salgado Ferreira、Renata Barbosa de Oliveira
DOI:10.1016/j.bmc.2017.02.009
日期:2017.3
Analogues of 8-chloro-N-(3-morpholinopropyl)-5H-pyrimido[5,4-b]indol-4-amine 1, a known cruzain inhibitor, were synthesized using a molecular simplification strategy. Five series of analogues were obtained: indole, pyrimidine, quinoline, aniline and pyrrole derivatives. The activity of the compounds was evaluated against the enzymes cruzain and rhodesain as well as against Trypanosoma cruzi amastigote
使用分子简化策略合成了已知的克鲁萨因抑制剂8-氯-N-(3-吗啉代丙基)-5H-嘧啶[5,4-b]吲哚-4-胺1的类似物。获得了五个系列的类似物:吲哚,嘧啶,喹啉,苯胺和吡咯衍生物。评估了该化合物对克鲁萨因和罗得沙星酶以及克鲁斯锥虫锥虫和锥虫鞭虫形式的活性。4-氨基喹啉衍生物对两种酶均显示出有希望的活性,IC50值为15至125µM。这些衍生物是寄生蛋白酶的选择性抑制剂,不能抑制哺乳动物组织蛋白酶B和S。抗克鲁萨因活性最高的化合物(化合物5a; IC50 = 15µM)比1具有更强的合成可及性,同时保留了其配体效率。如对原始铅所观察到的,化合物5a被证明是竞争性酶抑制剂。此外,它还对克氏锥虫具有活性(IC50 = 67.7µM)。有趣的是,嘧啶衍生物4b虽然在酶促测定中没有活性,但与未感染的成纤维细胞相比,它对克鲁斯锥虫(IC50 = 3.1µM)具有很高的选择性指数(SI = 128),