The invention belongs to the field of
organic synthesis and
pesticide application, and particularly relates to application of a novel isoindolone substance, the
structural formula is as follows: R1 is
hydrogen, 3-methyl, 4-methyl, 4-methoxyl, 3-methoxyl or 2-methoxyl
chloride; meanwhile, the N-methylbenzylamine can also be changed into N-methyl-N-(4-picolyl) amine (2) and N-methyl-2-thiophenemethylamine (3). Wherein R2 is selected from
hydrogen, 3-methyl, 4-methyl, 5-methyl, 6-methyl, 3-methoxyl, 4-methoxyl, 5-methoxyl, 6-methoxyl,
fluorine and
chlorine; meanwhile, the 2-methoxy
methyl benzoate can also be changed into the 2-methoxy methyl nicotinate
pyridine (4). A
biological activity determination result shows that the isoindolone compound containing the
thiophene and methyl structure has medium to excellent inhibitory activity on
phytophthora capsici, the activity of the
compound A31 is the best, the inhibitory activity on the
phytophthora capsici is 95 + / -3% and is equivalent to that of a control
drug metalaxyl, and EC50 is equal to 1.3048 mu g / mL and is superior to that of the control
drug metalaxyl.