Synthesis and Insecticidal Activity of Novel Pyrethroids Based on Aryloxypyridinyl Ethanone Plug-in Molecules

Area of Science:

• Agrochemicals
• Organic Synthesis
• Medicinal Chemistry

Background:

• Pyrethroids are crucial for managing agricultural and public health pests.
• Further development of pyrethroids is needed to address existing challenges and concerns.
• Novel pyrethroid structures incorporating pyridine heterocycles offer potential for enhanced efficacy and selectivity.

Purpose of the Study:

• To synthesize and evaluate novel pyrethroids containing pyridine heterocycles.
• To investigate the structure-activity relationships of these new compounds.
• To identify lead compounds with significant insecticidal and acaricidal activity.

Main Methods:

• Synthesis of four novel series of pyrethroids utilizing aryloxypyridinyl ethanone scaffolds.
• Biological evaluation of synthesized compounds against key agricultural and public health pests.
• Molecular docking studies to elucidate interactions at the receptor level.

Main Results:

• Compound 4-1 demonstrated significant activity against both mosquitoes and aphids.
• Substitution of the α-cyano group with a methyl group reduced activity, but pyridyl group introduction mitigated this effect and enhanced selectivity.
• Structure-activity relationship studies confirmed that a meta-positioned phenoxy group on the pyridine ring enhances activity.

Conclusions:

• Novel pyrethroids incorporating pyridine heterocycles show promise for pest management.
• Structural modifications, particularly the introduction of pyridyl groups, are key for enhancing species selectivity.
• Further optimization of synergistic interactions and structure-activity relationships is essential for advancing pyrethroid development.