Catalyst-free synthetic method of profenofos original medicine
A synthesis method and profenofos technology are applied in the field of catalyst-free profenofos technical synthesis to achieve the effects of ensuring health, low cost and reducing occupational hazard factors
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[0020] A kind of catalyst-free profenofos former drug synthetic method, comprises the steps:
[0021] 1). O, O-diethyl-O-(2-chloro-4-bromophenyl)-phosphorothioate and trimethylamine are heated under reflux to undergo a dealkylation reaction, and the trimethylamine is removed by rotary evaporation under reduced pressure to obtain Onium salt intermediate;
[0022] 2). Add water and bromopropane to the onium salt intermediate obtained in the previous step, and use nitrogen pressure in a closed container to carry out transposition synthesis;
[0023] 3). The product obtained in step 2) is allowed to stand for stratification, and the water in the upper layer is removed. The obtained product is the crude profenofos product. The crude product of profenofos is washed with water, and the solvent is distilled off to obtain the profenofos product.
[0024] The reaction temperature of O,O-diethyl-O-(2-chloro-4-bromophenyl)-phosphorothioate and trimethylamine in step 1) is 60±5°C.
[002...
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