A kind of preparation method of 4-amino-2,6-dimethoxypyrimidine
A technology of dimethoxypyrimidine and hydroxypyrimidine sodium salt is applied in the field of preparation of 4-amino-2,6-dimethoxypyrimidine, and can solve the problems of hidden dangers in production safety, aggravated by-products, high pressure on environmental protection and the like, Achieve the effect of reducing equipment requirements, simple equipment, and reducing pollutant emissions
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[0008] 1. The process is simple and the equipment is simple. The acidification and chlorination processes in the traditional process are omitted, and the finished product can be obtained only in two steps of cyclization and methylation. And all reactions can be carried out in the same vessel, reducing equipment requirements. 2. The yield has been greatly improved. Because 4-amino-2,6-dihydroxypyrimidine sodium salt is easy to open and hydrolyze in water, the yield of the original process is not high. The 4-amino-2,6-dihydroxypyrimidine sodium salt generated by the present invention does not need to be separated, and can directly participate in the next step reaction, thereby avoiding its ring-opening hydrolysis. 3. The chlorination process is omitted, the production cost is reduced, and the operating environment is greatly improved. 4. Significantly reduce pollutant emissions. The acidification, chlorination and methoxylation processes in the original process all produce a...
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