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  • Title: New N-methylpiperazinyl derivatives of bicyclic antiprotozoal compounds.
    Author: Faist J, Seebacher W, Saf R, Brun R, Kaiser M, Weis R.
    Journal: Eur J Med Chem; 2012 Jan; 47(1):510-9. PubMed ID: 22136906.
    Abstract:
    The 4-methylpiperazinyl group was inserted as substituent at the bridgehead of bicyclic compounds or as terminal group of their aminoacyl and aminoalkyl side chains. The new compounds were tested in vitro for their activities against the multidrug-resistant K(1) strain of Plasmodium falciparum and Trypanosoma brucei rhodesiense (STIB 900). The results were compared to those of formerly prepared analogues and of drugs in use. A couple of bicyclo-octyl ω-(4-piperazin-1-yl)alkanoates showed high antitrypanosomal (IC(50)≤0.087μM) and antiplasmodial activity (IC(50)≤0.06μM). The most active ω-(4-methylpiperazin-1-yl)alkyl-2-azabicyclo-nonane possessed higher antiplasmodial activity (IC(50)≤0.023μM) and selectivity (S.I.=IC(50) (Cytotox.)/IC(50) (P. falciparum)=2188) than the antimalarial drug chloroquine (IC(50)=0.15μM, S.I.=1257).
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