Selective Insect Growth Regulator for Spodoptera littoralis Control
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Solution Overview
Problem
Current insecticides are often toxic to vertebrates and may not effectively target pests, necessitating the development of selective and less harmful insect growth regulators.
Innovation Solution
The synthesis of Ethyl-2-{[(2,4-dichlorobenzoyl)carbamothioyl]amino}-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate, a unique insect growth regulator, which is confirmed through elemental and spectroscopic investigations, and its application as an insecticidal agent, demonstrated to be effective against Spodoptera littoralis with an LC50 of 270.2 mg/L compared to Diflubenzuron's 45.20 mg/L.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insecticides are used, then insecticidal effectiveness is achieved, but toxicity to vertebrates increases
Solution Approach 1:
The patent segments the insecticide market into conventional broad-spectrum insecticides and selective juvenile hormone analogs. The synthesized compound belongs to the latter category, targeting specific insect physiological processes (juvenile hormone receptor binding) rather than affecting all organisms equally, thus reducing vertebrate toxicity while maintaining insecticidal effectiveness
Solution Approach 2:
The compound exhibits local quality through selective action - it specifically targets juvenile hormone receptors in insects (particularly Spodoptera littoralis) without affecting vertebrate physiological systems. This selectivity is achieved through the molecule's specific structural features that match insect hormone receptors but not vertebrate targets
2Object-affected harmful factors
If new insect growth regulators are developed, then selectivity and reduced vertebrate toxicity are achieved, but insecticidal effectiveness decreases
Solution Approach 1:
The patent optimizes key parameters of the juvenile hormone analog structure to balance selectivity and effectiveness. By modifying the molecular structure (specifically the aryl carbamothioylamino group at position 2 of the benzothiophene core), the compound achieves improved binding affinity to insect juvenile hormone receptors while maintaining selectivity against vertebrates
Solution Approach 2:
The synthesized compound represents a composite molecular structure combining the benzothiophene core with a dichlorobenzoylcarbamothioylamino substituent. This composite structure integrates features that provide both selective juvenile hormone receptor binding (reducing vertebrate toxicity) and enhanced insecticidal activity through optimized molecular recognition
3Object-affected harmful factors
If selective juvenile hormone analogs are used, then vertebrate safety is improved, but development complexity increases
Solution Approach 1:
The patent describes a multi-functional synthesis pathway that can produce various juvenile hormone analogs using similar reaction sequences and reagents. The core benzothiophene structure serves as a universal platform that can be modified with different aryl carbamothioylamino groups to create a series of related compounds with potentially different activity profiles, reducing overall development complexity
Data Source
AI summary
Synthesis of a compound Ethyl-2-{[(2,4-dichlorobenzoyl)carbamothioyl]amino}-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate and its use as an insecticidal agent.