Natural Products-Based Insecticidal Agents

Natural products derived from plants and microorganisms have yielded a diverse arsenal of insecticidal agents, including alkaloids, terpenoids, phenolics and essential oils. These compounds act through multiple modes—neurotoxic disruption, hormonal interference, inhibition of digestive enzymes and antifeedant effects—offering routes to circumvent resistance to synthetic pesticides. Recent advances in chromatographic profiling, bioassay-guided isolation and omics technologies have illuminated key structural motifs and modes of action. Semi-synthetic modifications such as halogenation, acylation and heterocycle incorporation have enhanced potency and selectivity, while formulation strategies including nanoemulsions and encapsulation address stability and delivery challenges. The integration of natural product insecticides into integrated pest management supports sustainable agriculture, reduced environmental persistence and protection of non-target organisms.

Research from Nature Portfolio

Selective bromination of the furan ring in fraxinellone templates has produced novel derivatives with superior larvicidal activity against Mythimna separata. Gram-scale protocols combined with Suzuki–Miyaura coupling enabled systematic variation of substituents, revealing that halogen position and electronic properties critically determine potency. These findings underscore the furan moiety’s role and inform rational design of next-generation natural product insecticides.

Complementary halogenation and acylation of fraxinellone’s C-ring have yielded thioether and acyl analogues exhibiting higher mortality rates than standard botanical extracts. Single-crystal X-ray diffraction confirmed stereochemical details, while bioassays demonstrated broad efficacy across lepidopteran pests. This semi-synthetic approach exemplifies how targeted chemical modifications of a single natural scaffold can generate structurally diverse and potent insecticidal agents.

Natural Products-Based Insecticidal Agents publication trend

The graph below shows the total number of articles in natural products-based insecticidal agents across all publications each year (not limited to Nature Index journals).

Technical terms

Limonoids: Tetranortriterpenoid natural products from Meliaceae and Rutaceae families with insecticidal and antifeedant activities.

Fraxinellone: A furan-containing limonoid scaffold isolated from Dictamnus dasycarpus used in semi-synthetic insecticide development.

Antifeedant activity: The ability of a substance to deter insect feeding without necessarily causing mortality.

Structure–Activity Relationship: Analysis correlating chemical structure modifications with changes in biological efficacy.

Halogenation: The chemical introduction of halogen atoms into a molecule to alter its biological and physicochemical properties.

References

1. Furan-Site Bromination and Transformations of Fraxinellone as Insecticidal Agents Against Mythimna separata Walker. Scientific Reports (2018).
2. New Insecticidal Agents from Halogenation/Acylation of the Furyl-Ring of Fraxinellone. Scientific Reports (2016).
3. Degraded limonoids: biologically active limonoid fragments re-enhancing interest in Meliaceae and Rutaceae sources. Phytochemistry Reviews (2023).
4. Semisynthesis and insecticidal activity of some novel fraxinellone-based thioethers containing 1,3,4-oxadiazole moiety. Royal Society Open Science (2017).