Synthesis and herbicidal activity of N-2-(4,6-dimethoxypyrimidin-2-yloxy) benzylidene substituted amine derivatives

Six title compounds(3a-3f) were synthesized using 2-hydroxybenzaldehyde as starting material by substitute reaction,addition reaction and elimination reaction.Thereinto,3a-3d were new compounds.All of the synthesized compounds were confirmed by 1H NMR,MS and elemental analysis.The preliminary bioassay results showed that the inhibition rate of synthesized compounds to the Echinochloa crus-galli,Digitaria sanguinalis,Bluegrass,Amaranthus retroflexus and Chenopodium album reached 80%,except 3f to the E. crus-galli was 55% at the application rate of 150 g a.i./hm2.The inhibition rate of some of the compounds to E. crus-galli,Poa annua,A. retroflexus or C. album reached 100% at the application rate of 150 g/hm2.