29924-68-3Relevant academic research and scientific papers
Synthetic method of azoxystrobin
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Paragraph 0052; 0053, (2017/07/04)
The invention discloses a method for synthesizing azoxystrobin. The method comprises the steps: enabling 4,6-dichloropyrimidine and 2-hydroxybenzonitrile to undergo coupling reaction in a proper solvent under alkaline conditions in the presence of a catalyst, so as to obtain a 4-chloro-6-(2-cyanophenoxy)pyrimidine reaction solution; directly adding 2-(2-hydroxyphenyl)-3,3-dimethoxy methyl propionate and a base into the reaction solution obtained in last step, so as to obtain a reaction solution, filtrating the reaction solution, so as to remove inorganic salts, washing the inorganic salts with a solvent, combining filtrates and washing solutions, and directly applying the combined filtrates and the combined washing solutions to reaction of the next step without any treatment; adding an acidic catalyst and acetic anhydride into the reaction solution obtained in last step, eliminating one part of methanol, and carrying out after-treatment, thereby obtaining azoxystrobin. According to the method disclosed by the invention, the reaction of each step is carried out under relatively mild conditions without high temperature and high vacuum, the operation is simple, the yield is high, and the quality of the product is good. When a quaternary ammonium salt is adopted as the catalyst, the reaction can be carried out in two phases, and the inorganic salts produced during the reaction are directly dissolved into a water phase, so that the difficult problems of low reaction speed, incompletion in reaction and the like caused by inorganic salt wrapping are solved.
Synthetic method of azoxystrobin
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Paragraph 0079; 0082; 0083, (2017/08/14)
The invention discloses a method for synthesizing azoxystrobin. The method comprises the steps: enabling 4,6-dichloropyrimidine and 2-(2-hydroxyphenyl)-3,3-dimethoxy methyl propionate to undergo coupling reaction in a proper solvent under alkaline conditions in the presence of a catalyst, so as to obtain 2-[2-(6-chloropyrimidin-4-yloxy)phenyl]-3,3-dimethoxy methyl propionate; adding 2-hydroxybenzonitrile and a base or a salt of 2-hydroxybenzonitrile, and reacting, so as to obtain 2-[2-[6-(2-cyanophenoxy)pyrimidin-4-yloxy]phenyl]-3,3-dimethoxy methyl propionate; eliminating one part of methanol, thereby obtaining azoxystrobin; or firstly, eliminating one part of methanol from 2-[2-(6-chloropyrimidin-4-yloxy)phenyl]-3,3-dimethoxy methyl propionate, obtained through reaction, and then, reacting with 2-hydroxybenzonitrile and the base or the salt of 2-hydroxybenzonitrile, thereby obtaining azoxystrobin. According to the method, a newly-designed catalyst is used, and separation and after-treatment processes are simplified, so that the method is applicable to large-scale industrial production.
