Synthesis and evaluation of the antitrypanosomal and antiplasmodial activities of new 4-aminobicyclo[2.2.2]octane derivatives

Several new 4-amino-6,7-diphenylbicyclo[2.2.2]octane derivatives, methylthiosemicarbazones of bicyclo[2.2.2]octan-2-ones and esters of bicyclo[2.2.2]octan-2-ols were prepared. Their antitrypanosomal activities against Trypanosoma brucei rhodesiense (STIB 900) and their antiplasmodial activity against the K1 strain of Plasmodium falciparum (resistant to chloroquine and pyrimethamine) were investigated using microplate assays. In addition to that, the cytotoxicity of the new compounds was determined using L-6 cells. The methylthiosemicarbazones show moderate antiprotozoal activities whereas some of the esters of piperonylic acid, homopiperonylic acid and 2-naphtoic acid exhibit remarkable antitrypanosomal and antiplasmodial activity.