摘要/Abstract

L-香芹酮是一种具有杀菌活性的天然产物, 可用作新型杀菌剂的先导化合物. 因此, 以L-香芹酮为先导化合物,采用活性亚结构拼接法合成了一系列含肟酯的L-香芹酮衍生物. 化合物的结构经过红外, ¹H NMR, ¹³C NMR和高分辨质谱确认. 本研究还测定了这些化合物对油菜菌核真菌、小麦赤霉真菌、水稻稻瘟真菌、西瓜枯萎真菌和水稻纹枯真菌5种植物病原真菌的抑菌活性, 结果表明大部分化合物显示了良好的抑菌活性. 其中(E)-2-甲基-5-(丙-1-烯-2-基)环 己-2-烯-1-酮O-(4-乙基苯甲酰基)肟(4e)对小麦赤霉的杀菌活性最好(EC₅₀=5.07 mg/L), (S,E)-2-甲基-5-(丙-1-烯-2-基)环己-2-烯-1-酮O-(3-甲基苯甲酰基)肟(4b)对油菜菌核的杀菌活性最好(EC₅₀=18.84 mg/L), 均优于对照药剂烯肟菌酯. 因此, L-香芹酮衍生物具有深入研究开发新型杀菌剂的潜力.
关键词: 天然产物, L-香芹酮, 合成, 杀菌活性
L-Carvone is a natural product with fungicidal activity, which can be used as a lead compound for screening new fungicides. A series of L-carvone derivatives containing an oxime ester moiety were synthesized by splicing active substructure strategy with L-carvone as the lead compound. The structures of the L-carvone derivatives were characterized by IR, ¹H NMR, ¹³C NMR and HRMS analyses. The antifungal activities of these compounds were evaluated against five plant pathogenic fungi, namely Sclerotinia sclerotiorum, Fusarium graminearum, Pyricularia grisea, Fusariwn oxysporum and Thanatephorus cucumeris. The results indicated that most of the compounds showed good antifungal activities. Among them, (E)-2- methyl-5-(prop-1-en-2-yl)cyclohex-2-en-1-one O-(4-ethylbenzoyl)oxime (4e) had the best fungicidal activity against Fusarium graminearum (EC₅₀=5.07 mg/L), and (S,E)-2-methyl-5-(prop-1-en-2-yl)cyclohex-2-en-1-one O-(3-methylbenzoyl)oxime (4b) had the best fungicidal activity against Sclerotinia sclerotiorum, (EC₅₀=18.84 mg/L), which were better than the commercial fungicide enestroburin. Therefore, L-carvone derivatives have the potential to develop new fungicides.
Key words: nature product, L-carvone, synthesis, fungicidal activity


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