Synthesis of novel N-pyridylpyrazole derivatives containing 1,2,4-oxadiazole moiety via 1,3-dipolar cycloaddition and their structures and biological activities
作者:Yan Zhang、Junfeng Shang、Huan Li、Hang Liu、Haibin Song、Baolei Wang、Zhengming Li
DOI:10.1016/j.cclet.2019.10.039
日期:2020.5
characteristics, and the relevance of the structure and the reaction activity of this type of compounds. The preliminary bioassays indicated that several compounds had good insecticidal activities, among which 12c showed a lethality rate of 80% towards Mythimna separata Walker at 200 μg/mL; some of the compounds exhibited favorable fungicidal activities at 50 μg/mL against Physalospora piricola, Rhizoctonia cereal
摘要以1,3-偶极环加成反应为原料,以戊醛,吡啶基吡唑羧酸和芳基胺为原料,高效合成了一系列新型的含1,2,4-恶二唑的N-吡啶基吡唑衍生物12a-h。通过熔点,1 H NMR,13 C NMR和元素分析或HRMS鉴定其结构。对12c和12g单晶结构的探索揭示了立体化学和取代基的东方特征,以及这种化合物的结构和反应活性的相关性。初步的生物分析表明,几种化合物具有良好的杀虫活性,其中12c对Mythimna separata Walker的致死率为200μg/ mL,杀灭率为80%。一些化合物在50μg/ mL的浓度下对皮毛小孢子菌(Physalospora piricola)表现出有利的杀真菌活性,谷物纹枯病菌,核盘菌菌核等,其中12a,12b,12c和12h可以被认为是新的杀真菌主导化合物,可进一步优化结构。这些发现以及本文中的结构-活性关系分析将为新的吡啶基吡唑衍生物的创新研究及其在农业化学领域中的应用提供有益的指导。