Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (2): 20230444.doi: 10.7503/cjcu20230444

• Organic Chemistry • Previous Articles     Next Articles

Design, Synthesis and Antifungal Activities of Novel Succinate Dehydrogenase Inhibitors Bearing a Pyrazolyl Acetamide Scaffold

WANG Xiaobin1,2(), DONG Xue1, WANG Ruiying1, ZHANG Juan2, WANG Mengqi3, ZHANG Zongqun1, YANG Tingyu1, XU Menghan1()   

  1. 1.Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening,College of Pharmacy
    2.Research Center of Ocean Engineering Technology,School of Ocean Engineering,Jiangsu Ocean University,Lianyungang 222005,China
    3.Jiangsu Key Laboratory of Pesticide Science,College of Sciences,Nanjing Agricultural University,Nanjing 210095,China
  • Received:2023-10-16 Online:2024-02-10 Published:2023-11-27
  • Contact: WANG Xiaobin, XU Menghan E-mail:xb_wang@jou.edu.cn;lidong.xu@foxmail.com
  • Supported by:
    the National Natural Foundation of China(32202334);the Natural Science Foundation of Jiangsu University, China(22KJB210009);the Research Fund for Talent Introduction of Jiangsu Ocean University, China(KQ21031);the Postgraduate Research & Practice Innovation Program of Jiangsu Ocean University, China(KYCX202340)

Abstract:

Aiming to search for novel fungicide candidates, a series of novel pyrazolyl acetamides potentially targeting fungal succinate dehydrogenase(SDH) were constructed by flexibly reinventing the dualistic amide linkage that emerges in the structure of pyrazole-4-carboxamide fungicides. The diphenylether-containing pyrazole-4- acetamide(6l) featuring broad-spectrum antifungal effects was screened via a mycelium growth rate method. The above molecule exhibited the conspicuous inhibitory effect against Rhizoctonia solaniFusarium graminearum and Botrytis cinerea at 50 μg/mL, with the inhibitory rates that were slightly better than that of hymexazol. Strikingly, the median effective concentration(EC50) of compound 6l against R. solani was estimated as 19.92 μg/mL that is better than that of hymexazol(76.74 μg/mL) and fluopyram(40.36 μg/mL). The bioactive evaluations against SDH indicated that a fungal SDH was the potential target of compound 6l for inhibiting R. solani. Subsequently, molecular docking studies implied that the diphenylether unit emerging in the structure of compound 6l could multiply interact with the pivotal residues locating at SDH protein pockets, which plays a critical role in guaranteeing the antifungal effect of diphenylether-containing pyrazole-4-acetamides. The above researches indicated that the diphenylether- containing pyrazole-4-acetamides exhibit obviously inhibitory effects against phytopathogenic fungi, and could be further optimized for developing novel fungicide candidates that could effectively control phytopathogenic fungi.

Key words: Discovery of antifungal lead, Pyrazolyl acetamide, Phytopathogenic fungi, Succinate dehydrogenase inhibitor

CLC Number: 

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