Synthesis and in vitro protozoocidal evaluation of novel diazabicyclic tropolone derivatives.

The synthesis and in vitro antiparasitic activity of twenty-seven novel diazabicycles based on tropolone ethers is presented. The compounds can be readily prepared by means of a high-yielding hetero Diels-Alder reaction using simple and readily available starting materials. Several of the new diazabicycles have in vitro activities against Trypanosoma cruzi, Leishmania donovani, Trypanosoma brucei rhodesiense, and chloroquine-resistant Plasmodium falciparum that are comparable or superior to those of currently employed protozoocidal agents.