Synthesis and biological activity of novel benzo-1,2,3-thiadiazole carboxylic ester derivatives

In order to develop novel elicitor,five new compounds containing aliphatic group and halogens were synthesized based on the modification of BTH.Their structures were identified by 1H NMR,MS or Elemental analysis and IR.Bioassay results indicated that compounds 5e and 5c at 500 mg/L showed good activity against the bacterial and fungal diseases tested.Specially,the activity of compound 5e against cucumber powdery mildew,cucumber anthracnose and rice bacterial blight were all above 90%.