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Synthesis, in vitro antimalarial activities and cytotoxicities of amino-artemisinin-ferrocene derivatives.

Novel derivatives bearing a ferrocene attached via a piperazine linker to C-10 of the artemisinin nucleus were prepared from dihydroartemisinin and screened against chloroquine (CQ) sensitive NF54 and CQ resistant K1 and W2 strains of Plasmodium falciparum (Pf) parasites. The overall aim is to imprint oxidant (from the artemisinin) and redox (from the ferrocene) activities. In a preliminary assessment, these compounds were shown to possess activities in the low nM range with the most active being compound 6 with IC50 values of 2.79 nM against Pf K1 and 3.2 nM against Pf W2. Overall the resistance indices indicate that the compounds have a low potential for cross resistance. Cytotoxicities were determined with Hek293 human embryonic kidney cells and activities against proliferating cells were assessed against A375 human malignant melanoma cells. The selectivity indices of the amino-artemisinin ferrocene derivatives indicate there is overall an appreciably higher selectivity towards the malaria parasite than mammalian cells.

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