Regioselective Synthesis of 5- and 3-Hydroxy-N-Aryl-1H-Pyrazole-4-Carboxylates and Their Evaluation as Inhibitors of Plasmodium falciparum Dihydroorotate Dehydrogenase
作者:Luka Vah、Tadej Medved、Uroš Grošelj、Marina Klemenčič、Črtomir Podlipnik、Bogdan Štefane、Jernej Wagger、Marko Novinec、Jurij Svete
DOI:10.3390/molecules27154764
日期:——
pyrazole derivatives for the inhibition of PfDHODH showed that 1-(naphthalene-2-yl)-5-hydroxy-1H-pyrazole-4-carboxylate and 1-(naphthalene-2-yl)-, 1-(2,4,6-trichlorophenyl)-, and 1-[4-(trifluoromethyl)phenyl]-3-hydroxy-1H-pyrazole-4-carboxylates (~30% inhibition) were slightly more potent than a known inhibitor, diethyl α-[(1H-indazol-5-yl)amino]methylidene}malonate (19% inhibition).
对各种区域异构体 5- 和 3-羟基取代的烷基 1-芳基-1 H-吡唑-4-羧酸酯及其无环前体的计算机评估在它们与恶性疟原虫二氢乳清酸脱氢酶活性位点的结合方面产生了有希望的结果(Pf DHODH)。因此,通过烯胺酮型试剂或关键中间体通过两步合成制备了四种1-芳基-5-羟基-1H-吡唑-4-甲酸乙酯及其3-羟基区域异构体。使用文献方案进行5-羟基-1H-吡唑的合成,包括酸催化[(二甲基氨基)亚甲基]丙二酸二乙酯与芳基肼的氨基转移,随后碱催化中间体腙的环化。为了合成异构的1-芳基-3-羟基-1H-吡唑-4-羧酸甲酯,开发了一种新型的两步合成方法。其包括用甲基丙二酰氯酰化肼,然后用叔丁氧基-双(二甲氨基)甲烷环化肼。测试吡唑衍生物对Pf DHODH的抑制作用表明,1-(萘-2-基)-5-羟基-1 H-吡唑-4-羧酸酯和 1-(萘-2-基)-, 1-(2 ,4,6-三氯苯基)-和 1-[4-(三氟甲基)苯基]-3-羟基-1