Design, Synthesis, and 3D-QASR of Oxazoline Derivatives Containing an S-S Moiety as Potential Acaricide.

To mitigate the detrimental effects of agricultural pest mites on crop yield, an active substructure splicing strategy was employed to modify etoxazole by introducing an S-S moiety. The target products were obtained efficiently via a bilateral disulfurating reagent (DSMO), which was developed by our group. The leaf dip method was used to evaluate the activities of the designed target compounds against the eggs and larvae of the spider mite (). Most of the target compounds exhibited good efficacy in controlling the larvae and eggs of . Based on these results, a three-dimensional quantitative structure-activity relationship (3D-QSAR) model was established to guide the construction of compound . Notably, compound exhibited a better activity against eggs (LC = 0.0035 mg/L) compared to etoxazole (LC = 0.2990 mg/L). Greenhouse bioassays indicated that compound exhibits excellent acaricidal activity against egg of , which is better than the etoxazole at 1.0 mg/L. Additionally, some of the compounds showed inhibitory effects against (), (), (), and (). Furthermore, compounds not only exhibited relatively potent against activities (LC = 24.0 mg/L) but also had low toxicity (LC > 11.0 μg/bee) to . In conclusion, the current experimental results suggest that oxazoline derivatives containing an S-S moiety have the potential to serve as lead compounds for the development of novel acaricide agents.