Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (2): 151-157.DOI: 10.11944/j.issn.1000-0518.2015.02.140163

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Synthesis and Biological Activity of Novel 1,2,4-Triazolothiadiazine Derivatives Containing Pyrazole Unit

ZHENG Yuguo*, GUO Qingqing, ZHOU Li, LI Shijie, YU Zhonglin, LIU Cuiju, XIONG Xiang   

  1. Institute of Green Chemistry-Synthesis Technology,Key Laboratory of Research and Development of Ethnomedicinal Biological Resources,Xingyi Normal University for Nationalities,Xingyi,Guizhou 562400,China
  • Received:2014-05-06 Revised:2014-07-21 Published:2015-02-10 Online:2015-02-10
  • Contact: Corresponding author:ZHENG Yuguo, associate professor; Tel:0859-3222483; E-mail:yuguobaolong@163.com; Research interests:design and research of novel pesticide
  • Supported by:

    Supported by Natural Science Foundation of Guizhou Province(No.2010090), the Promotion Project of Higher Education of Guizhou Province(No.[2011]278), Higher Educational Quality and Reform Project of Guizhou Province(No.[2011]281, No.[2012]426, No.[2013]446), the Natural Science Foundation of Xingyi Normal University for Nationnality(No.llxyy202)

Abstract:

A series of 4-(1-phenyl-3-methyl-5-chloro-1H-pyrazolelideneamino)-5-(substituted aryl)-2H-1,2,4-triazole-3(4H)-thiones was synthesized by the condensation reaction of 5-chloro-1-phenyl-3-methyl-1H-pyrazole-4-aldehyde with 4-amino-5-(substituted phenyl-2H-1,2,4-triazole-3(4H)-thione. Alkylation of compound 6 with ethyl-2-chloroacetate or 1-(chloromethyl)-4-nitrobenzene afforded 5,6-2H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazine derivatives containing pyrazole unit. Their structures were confirmed by 1H NMR, IR and elemental analyses. Preliminary bioassay indicates that the anti-fungicidal activity of compound 8a(3-(2-methyphenyl)-6-(5-chloro-2-methyl-4-phenylpyrazole)-7-(4-nitrophenyl)-5H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazine) to Colletotrichum lagenarium at the concentration of 100 mg/L is 90%.

Key words: pyrazo, triazolo[3, 4-b][1, 3, 4]thiadiazine, synthesis, bioactivity

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