Benzothiadiazine derivative and application thereof in agriculture
A compound, nitrogen oxide technology, applied in the field of pesticides, can solve the problems of low selectivity, insufficient herbicidal effect, and no weed plants
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[0168] Example 1: 3-(2,6-dimethylphenyl)-6-(1-ethyl-5-hydroxyl-1H-pyrazole-4-carbonyl)-1-methyl-1H-benzo[ c] Synthesis of [1,2,6]thiadiazin-4(3H)-one 2,2-dioxide
[0169]
[0170] Step 1: Synthesis of 4-nitroisophthalic acid
[0171]
[0172] At room temperature, potassium hydroxide (12.39g, 662mmol), water (400mL) and 2-nitro-5-methylbenzoic acid (40g, 220mmol) were added to a 1L reaction flask, and heated to 90°C until the solid was completely After dissolving, potassium permanganate (104.69 g, 662 mmol) was added in batches, and the stirring reaction was continued at 90° C. for 3 hours. Filter the reaction solution while it is hot, rinse the filter residue with water (50mL×2), wait until the temperature of the obtained liquid is cooled to room temperature, adjust the pH value of the liquid to make it pH=1, stir at 0°C for 30 minutes, filter, and dry the filter cake , to obtain 43g of white solid, yield 92%.
[0173] MS(ES-API,pos.ion)m / z:209.9[M-H] - .
[0174] S...
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