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Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (7): 20260128.doi: 10.7503/cjcu20260128

• Organic Chemistry • Previous Articles    

Synthesis and Fungicidal Activity of Pyramoxadone Analogues

BAI Hui1, LIU Yanfei2, FU Bin2(), XIAO Yumei2, QIN Zhaohai2()   

  1. 1.Department of Biomedical Technology,Shijiazhuang Information Engineering Vocational College,Shijiazhuang 052161,China
    2.College of Science,China Agricultural University,Beijing 100193,China
  • Received:2026-03-25 Online:2026-07-10 Published:2026-05-06
  • Contact: FU Bin, QIN Zhaohai E-mail:fubinchem@cau.edu.cn;qinzhaohai@263.net
  • Supported by:
    the National Natural Science Foundation of China(21877125)

Abstract:

A series of novel oxazolidinedione derivatives(22230) was designed and synthesized based on the structure of pyramoxadone, a 5-position pyridine analogue of famoxadone. The target compounds were characterized by means of 1H NMR, 13C NMR and high-resolution mass spectrometry(HRMS). Their in vitro antifungal activities were evaluated against nine plant pathogenic fungi using the mycelial growth rate method, with famoxadone as a positive control. Preliminary screening at 50 mg/L revealed that most compounds exhibited moderate to excellent inhibitory activity, particularly against Rhizoctonia solaniSclerotinia sclerotiorumBotrytis cinerea, and Pyricularia grisea. Structure-activity relationship(SAR) analysis indicated that bulky groups such as tert-butyl and cyclohexyl are detrimental to the enhancement of antifungal activity, while fluorine-containing compounds generally exhibited enhanced antifungal activity. Compounds 216(EC50=3.78 mg/L) and 226(EC50=1.61 mg/L) exhibited superior activity against R. solani compared to famoxadone(EC50=4.38 mg/L) and pyramoxadone(EC50=9.67 mg/L). In vivo protective efficacy assays demonstrated that compounds 213216 and 218 provided 88.3%, 89.5% and 81.7% control against cotton damping-off at 200 mg/L, respectively, significantly outperforming the positive control. Molecular docking and electrostatic surface map analysis revealed that the SAR of this class of compounds follows a pattern where the hydrophobic skeleton determines the binding orientation, electrostatic complementarity determines the binding strength, and substituent fine-tuning determines the activity level.

Key words: Famoxadone, Oxazolidinedione, Antifungal activity, Structure-activity relationship(SAR), Molecular docking

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