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Updated: May 9, 2026

Protocols for Testing the Toxicity of Novel Insecticidal Chemistries to Mosquitoes

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Published on: February 13, 2019

Deuteration-Based Design, Green Synthesis, and Insecticidal Activity of Hexacyclic Pyrazol-3-amide Derivatives as

Shihui Luo¹, Bingbo Guo¹, Yan Liu¹

¹Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, China.

Journal of Agricultural and Food Chemistry

|April 15, 2025

Summary

Deuteration of insect growth regulators (IGRs) at the benzylic position enhances insecticidal activity against Plutella xylostella. This strategy improves compound efficacy and offers a promising approach for pest control.

Keywords:

2-methyltetrahydrofuran deuteration strategy insect growth regulators insecticidal activity mechanism reductive deuteration

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Last Updated: May 9, 2026

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Published on: December 8, 2023

Area of Science:

Organic Chemistry
Insecticide Development
Medicinal Chemistry

Background:

The deuterium kinetic isotope effect (DKIE) highlights C-D bond stability, crucial for improving pharmacokinetic profiles and reducing compound toxicity.
Insect growth regulators (IGRs) are vital for pest management, but enhancing their efficacy and safety remains a key challenge.

Purpose of the Study:

To investigate the deuteration strategy for improving the activity of insect growth regulators (IGRs).
To synthesize novel deuterated hexacyclic pyrazol-3-amide derivatives and evaluate their insecticidal properties.

Main Methods:

A novel, green method using samarium diiodide (SmI2) and 2-methyltetrahydrofuran (2-MTHF) was employed for reductive deuteration at the benzylic position.
Six deuterated compounds (D-1 to D-6) were synthesized and tested against Plutella xylostella, with their insecticidal activity compared to nondeuterated analogs (H-1 to H-6).
Inhibitory activities against the ecdysone receptor/ultraspiracle protein (EcR/USP) and chitinases (OfChtI, OfChtII, OfChi-h) were assessed.

Main Results:

Deuterated compounds exhibited significantly lower LC50 values against Plutella xylostella compared to their nondeuterated counterparts.
Compound D-3 showed a 18-fold improvement in activity (LC50: 11 mg/L) over H-3 (LC50: 197 mg/L), outperforming commercial tebufenozide.
Deuteration enhanced binding affinity specifically to Chitinase OfChtI and resulted in lower ClogP values and reduced energy gaps.

Conclusions:

The deuteration strategy is effective in enhancing the insecticidal activity of hexacyclic pyrazol-3-amide derivatives.
Improved binding affinity to Chitinase OfChtI and favorable physicochemical property changes contribute to the enhanced efficacy of deuterated compounds.
This study establishes deuteration as a promising approach for developing more potent and effective pest control agents.