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Conformational properties of pyrethroids
1Zeneca Agrochemicals, Jealott's Hill Research Station, Bracknell, Berkshire, U.K.
Journal of Computer-Aided Molecular Design
|April 1, 1994
Summary
Pyrethroid insecticides exhibit rigid acid components and flexible alcohol components. Molecular modeling reveals a specific binding pocket, explaining how structural variations influence insecticidal activity.
Area of Science:
- Chemical structure and biological activity of pyrethroids
- Molecular modeling and computational chemistry
Background:
- Pyrethroid cyclopropanecarboxylate esters are widely used insecticides.
- Understanding their conformational flexibility is crucial for structure-activity relationship studies.
Purpose of the Study:
- To investigate the conformational properties of pyrethroid acid and alcohol moieties.
- To model the binding site interactions of insecticidal pyrethroids.
Main Methods:
- X-ray database searches and theoretical potential-energy calculations.
- Molecular modeling and graphics superposition techniques.
Main Results:
- Pyrethroid acid moieties are conformationally rigid, while alcohol moieties are flexible.
- 4-phenylindan-2-ol is a conformationally restricted pyrethroid alcohol.
- A large, narrow, and asymmetric binding pocket was identified for pyrethroid esters.
- Substituents at the 3-position of the cyclopropane ring are accommodated in this pocket.
Conclusions:
- The conformational flexibility of alcohol moieties influences insecticidal activity.
- The identified binding pocket explains the accommodation of substituents and stereochemical effects.
- Alpha-substitution effects on activity are linked to conformational preferences.