A rational molecule design strategy based on scaffold hopping was applied to discover novel leads, and then a series of novel pyrazole amide derivatives were designed, synthesized, characterized, and evaluated for their antifungal activities. Bioassay results indicated that some target compounds such as S3, S12, and S26 showed good in vivo antifungal activities; among them, S26 exhibited commendable
应用基于支架跳跃的合理分子设计策略发现新的先导分子,然后设计、合成、表征和评估了一系列新型
吡唑酰胺衍
生物的抗真菌活性。
生物测定结果表明,一些目标化合物如S3、S12和S26表现出良好的体内抗真菌活性;其中,S26在 100 μg/mL 时表现出值得称道的体内保护活性,对黄瓜灰霉病菌的抑制率为 89% ,与阳性对照
啶酰菌胺、异
吡唑啉和fluxapyroxad 相当。显微镜观察表明S26影响真菌的正常生长。荧光猝灭分析和
SDH(
琥珀酸脱氢酶)酶抑制研究证实S26可能不是
SDH
抑制剂。基于诱导植物防御反应测试,S26增强了黄瓜上RBOH、WRKY6、WRKY30、PR1和PAL防御相关
基因表达和防御相关酶苯丙
氨酸解
氨酶 (PAL) 表达的积累。这些发现支持S26不仅表现出直接的杀菌活性,而且表现出植物先天免疫刺激活性,它可以作为一种有前途的植物防御相关杀菌剂候选物。