In order to explore novel potent pesticide from pyrazole oxime derivatives, a series of new pyrazole oxime compounds carrying substituted pyrimidine moiety were synthesized by the method of active substructure combination. The structures of the title compounds were characterized by 1 H NMR, 13 C NMR, MS and elemental analysis. Preliminary bioassay data displayed that some target compounds showed certain insecticidal activities. At the concentration of 500 μg/mL, compounds 6b and 6c exhibited 60% and 70% insecticidal activity against Aphis craccivora, compounds 6a, 6b, 6c, and 6d had 100%, 100%, 100% and 90% insecticidal activity against Nilaparvata lugens. When the concentration was reduced to 100 μg/mL, compounds 6a, 6b and 6d were still active against Nilaparvata lugens with inhibitory values of 60%, 60% and 50%, respectively. In addition, insecticidal activities against Oriental armyworm of compounds 6f, 6g and 6m were 80%, 70% and 90%, respectively, at 500 μg/mL.
Abstract:In this study, in order to find novel biologically active pyrazole oxime compounds, a number of dichloro-allyloxy-phenol-containing pyrazole oximes were designed and synthesized according to the method of active group combination. All of the target compounds were confirmed by 1 H-NMR, 13 C-NMR and elemental analysis. In addition, bioassays showed that all of the newly synthesized compounds had no acaricidal activity against Tetranychus cinnabarinus and low insecticidal activity against Aphis craccivora at tested concentrations. However, most of them displayed excellent insecticidal activity against Oriental armyworm at a concentration of 500 µg/mL, and some designed compounds still exhibited potent insecticidal activity against Oriental armyworm even at the dose of 20 µg/mL, especially compounds 7f, 7n and 7p had 100%, 90% and 90% inhibition rates, respectively, which were comparable to that of the control pyridalyl.
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