Synthesis and biological screening of some pyridine derivatives as anti-malarial agents

摘要

Two series of pyridine derivatives were synthesised and evaluated for their in vivo anti-malarial activity against Plasmodium berghei. The anti-malarial activity was determined in vivo by applying 4-day standard suppressive test using chloroquine (CQ)-sensitive P. berghei ANKA straininfected mice. Compounds 2a, 2g and 2h showed inhibition of the parasite multiplication by 90, 91 and 80%, respectively, at a dose level of 50 mol/kg. Moreover, The most active compounds (2a, 2g and 2h) were tested in vitro against CQ-resistant Plasmodium falciparum RKL9 strains where compound 2g showed promising activity with IC 50=0.0402 M. The compounds were non-toxic at 300 and 100mg/kg through the oral and parenteral routes, respectively. The docking pose of the most active compounds (2a, 2g and 2h) in the active site of dihydrofolate reductase enzyme revealed several hydrogen and hydrophobic interactions that contribute to the observed anti-malarial activities.