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The search for new drugs that could treat tropical protozoan diseases, such as malaria or neglected tropical diseases (NTDs), motivates many medicinal chemists. New classes of antiprotozoal drugs that act through a novel mechanism of action must be developed. This review presents our efforts toward finding new candidate treatments for malaria, American trypanosomiasis, human African trypanosomiasis and leishmaniasis based on π-delocalized lipophilic cations (DLCs). DLCs, such as rhodacyanines, azarhodacyanines, β-carbolinium salts, and phenoxazinium salts, displayed strong antiprotozoal activities with highly selective indices. Several DLCs displayed moderate to excellent in vivo efficacies against Plasmodium berghei when administered intraperitoneally or orally. This review also discusses chemical biology approaches to understanding the mechanism of action underlying the antimalarial rhodacyanines.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

π-Delocalized Lipophilic Cations as New Candidates for Antimalarial, Antitrypanosomal and Antileishmanial Agents: Synthesis, Evaluation of Antiprotozoal Potency, and Insight into Their Action Mechanisms