Antimalarial Peroxide Synthesis and Mechanisms

The emergence of artemisinin resistance has spurred renewed interest in peroxide-based antimalarials. Natural peroxides such as artemisinin feature an endoperoxide bridge that is activated by intraparasitic haem iron, leading to the generation of carbon-centred radicals that alkylate proteins and disrupt redox homeostasis in Plasmodium species. Synthetic strategies therefore focus on reproducing or modifying this peroxide pharmacophore to enhance efficacy, stability and manufacturability. Semi-synthetic routes convert artemisinin extracted from Artemisia annua into derivatives such as dihydroartemisinin, artemether and artesunate, balancing lipophilicity and bioavailability. Parallel efforts in fully synthetic peroxides include the construction of 1,2,4-trioxanes, trioxolanes and tetraoxanes via catalytic photooxygenation, peroxyacetal formation and metal-mediated peroxidation of carbonyl precursors. Key challenges lie in controlling the stereochemistry of the peroxide ring, achieving high yields under green-chemistry principles and ensuring chemical robustness during storage and transport. Mechanistic studies have elucidated that peroxide bond cleavage proceeds through iron(II)-mediated homolysis, with subsequent radical propagation causing oxidative stress and mitochondrial dysfunction in the parasite. Advances in mechanism-guided design promise new peroxide scaffolds with improved resistance profiles and scalable production routes suitable for widespread deployment in malaria-endemic regions.

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Antimalarial Peroxide Synthesis and Mechanisms publication trend

The graph below shows the total number of articles in antimalarial peroxide synthesis and mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

1,2,4-trioxane: Six-membered heterocycle containing a peroxide bridge critical for artemisinin activity.

1,2,4-trioxolane: Five-membered cyclic peroxide ring used as a simplified synthetic mimic of artemisinin.

Tetraoxane: Six-membered ring system featuring two peroxy linkages, designed for enhanced stability and potency.

Falcipain-2: Cysteine protease in Plasmodium falciparum involved in haemoglobin degradation and a target for peroxide inhibitors.

Photooxygenation: Light-induced reaction incorporating singlet oxygen to form peroxide rings in organic substrates.

References

1. Synthesis, antileishmanial, antimalarial evaluation and molecular docking study of some hydrazine-coupled pyrazole derivatives. BMC Chemistry (2024).
2. Peroxides with Anthelmintic, Antiprotozoal, Fungicidal and Antiviral Bioactivity: Properties, Synthesis and Reactions. Molecules (2017).
3. Novel series of 1,2,4-trioxane derivatives as antimalarial agents. Journal of Enzyme Inhibition and Medicinal Chemistry (2017).