Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (12): 2759.doi: 10.7503/cjcu20200462

• Organic Chemistry • Previous Articles     Next Articles

Design, Synthesis and Biological Activity of Pyrazole-4-carboxamides Compounds Containing 1,2,4,5-Tetrasubstituted Phenyl

DONG Xinrui, XIA Zhe, WANG Zhenxue, BIAN Qiang, LI Huabin()   

  1. College of Chemistry,Nankai University,Tianjin 300071,China
  • Received:2020-07-16 Online:2020-12-10 Published:2020-12-09
  • Contact: LI Huabin E-mail:lihuabinnk@163.com
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21102078);the Innovation Training Program of “National Undergraduate Training Programs for Innovation and Entrepreneurship” of China(201910055090)

Abstract:

To find novel fungicidal compounds with potent biological activities, a series of pyrazole-4-carbo- xamide compounds containing tetra-substituted phenyl groups was designed via the method of linking active sub-structures. The structures of all the compounds were confirmed by high resolution mass spectrometer(HRMS) and hydrogen nuclear magnetic resonance(1H NMR). The bioassay results showed that some compounds have obvious inhibitory activities against Physalospora piricola, Rhizoctonia solani, Sclerotinia sclerotiorum, and Botrytis cinerea. In particular, compound 5c, with 95.5% inhibition rate at a concentration of 50 μg/mL against Physalospora piricola, exhibited a broad spectrum of fungicidal activity. The initial structure-activity relationship indicated that the type of N-substituent on the pyrazole ring would influence the activity and methyl or tert-butyl were more beneficial. The compound 5 with a single benzene ring showed better activity than compound 5 with a bicyclic structure. Besides, compounds with a benzene ring substituent R2 less than four carbons were favorable to enhance fungicidal activity.

Key words: Pyrazole-4-carboxamide, Pyrazole, Tetra-substituted benzene, Fungicidal activity

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