Synthesis and Antifungal Activities of Glucosamine Aromatic Derivatives Against Four Phytopathogenic Fungi of Crops

作者：Lulu Wu, Lijun Shi, Liangxin Fan, Zhenliang Pan, Zhonglin Zhao, Hui Su, Caixia Wang, Nan Yang, Cuilian Xu, Cuilian Xu, Guoyu Yang · 发表于：Chemistry & Biodiversity · 年份：2024 · DOI：10.1002/cbdv.202401052 · 研究领域：Fungal Plant Pathogen Control、Plant Disease Resistance and Genetics、Plant-Microbe Interactions and Immunity

Abstract A series of diversified glucosamine derivatives ( 3a – 3y ) was synthesized and their antifungal activity was examined against four kinds of phytopathogens, Fusarium graminearum ( F. graminearum ), Fusarium moniliforme ( F. moniliforme ), Curvularia. lunata ( C. lunata ), and Rhizoctonia solani ( R. solani ) which cause seriously economic losses worldwide by affecting crops. The compound 3o showed remarkable antifungal activity against F. graminearum with EC 50 value of 3.96 μg/mL, compared to the standard drug triadimefon (10.1 μg/mL). 3D‐QSAR model with the statistically recommended values (r 2 =0.915, q 2 =0.872) showed that positive charge group or bulky group in the benzyl ring was favorable for the antifungal activity. Enzyme activity assays confirmed that 3o had a moderate inhibition of trehalase with inhibition rate of 51.4 % at 5 μg/mL, which is comparable to those of commercial inhibitor validamycin A with inhibition rate of 83.3 %. Molecular docking analysis revealed that 3o also had a hydrogen bond interaction with key amino acid residue compared to validoxylamine