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Biological activities of nitromethylene analogues of imidacloprid with a 4,5-dimethylated imidazolidine ring.
Journal of Pesticide Science 2023 November 21
Four nitromethylene analogues of imidacloprid (CH-IMIs) having a 4,5-dimethylated (diMe) imidazolidine ring were stereospecifically synthesized to evaluate their affinity for the nicotinic acetylcholine receptors of the housefly Musca domestica . Among the analogues, the 4 S ,5 R -diMe analogue showed the highest receptor affinity ( Ki =0.39 nM). The insecticidal activity against M. domestica of the synthesized compounds was also measured under synergistic and nonsynergistic conditions. Under nonsynergistic conditions, the insecticidal activity of the 4 S ,5 R -diMe analogue was the highest. The order of the insecticidal potency of the four diMe-CH-IMIs (4 S ,5 R ->4 R ,5 S -=4 R ,5 R ->4 S ,5 S -diMe analogues) was the same as that of the receptor affinity. Piperonyl butoxide (PBO) did not synergize with the test compounds, but both PBO and NIA16388 applications strengthened the activity of analogues other than the 4 S ,5 S -diMe analogue. This suggests that the configuration of the substituents on the imidazolidine ring should influence the metabolism process of CH-IMI in houseflies.
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