Synthesis and Biological Activity of N-Substituted 4H-benzoxazin-3-one

In search of novel compounds with high biological activities,18 N-substituted benzoxazinone derivatives were designed and synthesized.Their chemical structures were confimed by 1H NMR and elemental analysis.Preliminary bioassays showed that some of them have good herbicidal activity.The inhibition rate of c3,c5,c6,c7 and c8 to Ambrosia tricolor Linn. was up to 90% at the concentration of 100 mg/L.