Preparation method of 5-[(3, 4, 5-trimethoxyphenyl)-methyl]-2, 4-pyrimidine diamine
A technology of trimethoxyphenyl and trimethoxybenzaldehyde, which is applied in the field of preparation of 5-[-methyl]-2,4-pyrimidinediamine, can solve the problems of environmental protection and safety risks, difficult recovery of DMSO, and synthesis There are many reaction steps, etc., to achieve the effect of reducing the generation of solid waste, no impact on purity, and reducing equipment costs
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Embodiment 1
[0026] In a 1000mL four-necked flask equipped with mechanical stirring, add 21.3g of acrylonitrile and 37.4g of aniline into the flask and stir, then add 70.0g of methanol and 17.2g of sodium methoxide into the flask and stir until dissolved. Add 3,4,5-trimethoxybenzaldehyde crude product 75.0g,
[0027] After the addition was completed, the temperature was raised to reflux for 2 hours, followed by TLC until the spots of the TMB raw material disappeared. After the reaction, the temperature was cooled to 1°C, and stirred for 1 hour. After suction filtration, the filter cake was dried at 80°C to obtain 115.3 g of dry solids. 93%, purity ≥99.8%.
Embodiment 2
[0029] In a 1000mL four-neck flask equipped with mechanical stirring, add 21.3g of acrylonitrile and 37.4g of aniline into the flask and stir, then add 70.0g of methanol and 17.2g of sodium methoxide into the flask and stir until dissolved. Add 3,4,5-trimethoxybenzaldehyde crude product 75.0g,
[0030] After the addition was completed, the temperature was raised to reflux for 2.5 hours, followed by TLC until the spots of the TMB raw material disappeared. After the reaction was completed, the temperature was cooled to 3°C, and stirred for 1.2 hours. After suction filtration, the filter cake was dried at 85°C to obtain 116.5 g of dry solids. The yield is 94%, and the purity is ≥99.9%.
Embodiment 3
[0032] In a 1000mL four-neck flask equipped with mechanical stirring, add 21.3g of acrylonitrile and 37.4g of aniline into the flask and stir, then add 70.0g of methanol and 17.2g of sodium methoxide into the flask and stir until dissolved. Add 3,4,5-trimethoxybenzaldehyde crude product 75.0g,
[0033] After the addition was completed, the temperature was raised to reflux for 3 hours, followed by TLC until the spots of the TMB raw material disappeared. After the reaction, the temperature was cooled to 5°C, and stirred for 1.4 hours. After suction filtration, the filter cake was dried at 90°C to obtain 116.8 g of dry solids. The rate is 94%, and the purity is ≥99.9%.
[0034] Unless otherwise specified, the percentages used in the present invention are all mass percentages.
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