- Preparation method of flunixin meglumine
-
The invention discloses a preparation method of flunixin meglumine the preparation method, and the method specifically comprises the following steps: (1) adding 2-chloronicotinic acid and 2-methyl-3-trifluoromethyl aniline into a sodium hydroxide water solution for stirring, adding ethylene glycol as well as a phase transfer catalyst and p-toluenesulfonic acid and copper oxide, controlling the temperature and time, adjusting the pH value of the solution, stirring, standing, layering, stirring, filtering, washing filter cake, and drying to obtain flunixin; and (2) reacting the flunixin obtainedin the step (1) with N-methylglucosamine in isopropyl alcohol, and meanwhile, adding a filler; carrying out heating reflux, filtering, cooling, stirring and crystallizing, carrying out crystal suction filtration, and washing crystals with isopropanol to obtain the flunixin meglumine. The preparation method of the flunixin meglumine is convenient and simple in operation, the reflecting efficiencyis high, the reaction temperature is low, the reaction time is short, and the cost is low; moreover, the prepared flunixin meglumine is high in purity and high in yield.
- -
-
Paragraph 0022; 0025; 0038-0041; 0046-0053
(2019/01/24)
-
- Process for preparing flunixin and intermediates thereof
-
Process for preparing a key intermediate, 2-methyl-3-trifluoromethylaniline (MTA) of Flunixin, as well as novel intermediates thereof are described.
- -
-
-
