Probing 5-Nitroimidazole-Triazole Hybrids as Potential Anti-Kinetoplastid Agents: Synthesis and In Vitro Efficacy

Area of Science:

• Medicinal Chemistry
• Parasitology
• Drug Discovery

Background:

• Neglected tropical diseases like leishmaniasis and trypanosomiasis are inadequately treated by current drugs due to toxicity and resistance.
• Nitroheterocycles are effective against parasites via redox activation, and 1,2,3-triazole linkers allow for property modulation.

Purpose of the Study:

• To synthesize and evaluate novel 5-nitroimidazole-1,2,3-triazole hybrids for antiparasitic activity.
• To assess the substituent-dependent effects on the efficacy and selectivity of these compounds.

Main Methods:

• Synthesis of 5-nitroimidazole-1,2,3-triazole hybrids using copper(I)-catalyzed azide-alkyne cycloaddition.
• In vitro evaluation of antileishmanial and antitrypanosomal activity.
• Cytotoxicity profiling against mammalian cell lines.

Main Results:

• Most synthesized compounds displayed low toxicity to mammalian cells.
• No significant antileishmanial activity was observed.
• Compound 3j exhibited selective micromolar inhibition against Trypanosoma congolense (IC50 = 6.38 ± 1.03 µM, SI = 48).

Conclusions:

• The study identified a potential trypanocidal hit, compound 3j, with favorable selectivity.
• Further development of 5-nitroimidazole-1,2,3-triazole hybrids could lead to new therapies for human African trypanosomiasis.