新型生物农药–乙基多杀菌素的结构修饰与杀虫活性研究

Study on the structural modification and insecticidal activity of a new biological pesticide-spinetoram

  • 摘要: 甲基多杀菌素(spinosad)和乙基多杀菌素(spinetoram)为新型高效生物源杀虫剂多杀菌素(spinosyns)的商业化产品,具有杀虫活性高、降解速度快、对环境友好以及对非靶标生物毒性低等特点. 为了寻找更高效的杀虫剂,研究以乙基多杀菌素J为先导化合物,引入含有不同取代基的吡啶环,合成了一系列乙基多杀菌素衍生物,其结构经1H NMR, 13C NMR和HRMS表征确认,并测定了这些衍生物对棕榈蓟马和豌豆蚜的杀虫活性. 结果显示,新合成的衍生物对棕榈蓟马和豌豆蚜均表现出不错的杀虫活性,其中部分衍生物的杀虫活性优于甲基多杀菌素和乙基多杀菌素. 通过对乙基多杀菌素衍生物构效关系的初步分析,发现引入含有吸电子取代基(特别是氯、氟、三氟甲基等)的活性基团更有可能产生具有高效杀虫活性的多杀菌素化合物. 研究结果对今后乙基多杀菌素衍生化的研究具有重要意义.

     

    Abstract: Spinosad and spinetoram, as commercially available spinosyns products, which is a novel class of highly effective biological insecticides, demonstrate high insecticidal potency, rapid degradation rates, environmental compatibility, and low toxicity to non-target organisms. In order to identify more effective insecticides, this study utilized spinetoram J as the lead compound and introduced pyridine rings with various substituents to synthesize a series of spinetoram derivatives. The structures of spinetoram derivatives were confirmed by 1H NMR, 13C NMR and HRMS, and the insecticidal activity of derivatives against Thrips Palmi Karny and Acyrthosiphon Pisum was determined. The results showed that newly synthesized derivatives demonstrated good insecticidal activity against Thrips Palmi Karny and Acyrthosiphon Pisum, with some derivatives exhibiting superior efficacy compared to spinosad and spinetoram. A preliminary analysis of the structure-activity relationship of spinetoram derivatives revealed that the incorporation of active groups containing electron-withdrawing substituents (notably chlorine, fluorine, trifluoromethyl, etc.) was more likely to produce spinetoram derivatives with high insecticidal activity. This finding holds considerable importance for future research focused on the derivatization of spinetoram.

     

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