Synthesis and Bioactivity of Substituted 3H-Benzoxazol-2-ones

Thirty novel 3H-benzoxazol-2-ones were designed and synthesized. Their structures were confirmed by 1H NMR and elemental analysis. The preliminary bioassay showed that the compounds synthsized had insecticidal and fungicidal activities. The mortality of compounds 3b,4b,14b,19b to Culex pipiens pallens at the concentration of 50 mg/L reached 100%, the mortality rate of Tetranychus cennbarinus by some compounds at the concentration of 1 000 mg/L were all over 95%.