Preparation method of ropivacaine hydrochloride impurities
A technology for ropivacaine hydrochloride and impurities, which is applied in the field of preparation of ropivacaine hydrochloride impurities, can solve the problems of the undisclosed preparation method of ropivacaine hydrochloride impurities, and achieve high purity, high yield and low cost Effect
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[0028] The invention provides a method for preparing impurities of ropivacaine hydrochloride, the chemical structural formula of the impurities of ropivacaine hydrochloride is shown in formula I;
[0029]
[0030] The preparation method of the impurity of ropivacaine hydrochloride is obtained by mixing and purifying 2,6-dimethylaniline, Vilsmeier-Haack acid halide reagent and N,N-dimethylformamide.
[0031] Further, the method includes the following steps:
[0032] (1) 2,6-dimethylaniline, Vilsmeier-Haack acid halide reagent and N,N-dimethylformamide are mixed and stirred for reaction;
[0033] (2) adding water to the reaction system after the reaction in step (1) to quench and adjust the pH value to be not less than 6 and extract with an organic solvent;
[0034] (3) concentration and purification to obtain the ropivacaine hydrochloride impurity.
Embodiment 1
[0036] A kind of preparation method of ropivacaine hydrochloride impurity as the embodiment of the present invention, described method comprises the following steps:
[0037] (1) Mix and stir 5.2g of 2,6-dimethylaniline (0.043mol), 13.0g of phosphorus oxychloride (0.085mol) and 40mL of N,N-dimethylformamide until the reaction is completed, and pass through the point The plate method judges the end of the reaction;
[0038] (2) adding water to the reaction system after the reaction in step (1) to quench and adjust the pH value to 12 with sodium hydroxide and extract with toluene;
[0039] (3) The organic phases were combined, spin-dried, concentrated to dryness after passing through the column to obtain a white solid powder.
[0040] After determination, the present embodiment prepares 4.0 g of white solid powder with a purity of 99.0%. After mass spectrometry and nuclear magnetic detection, the result is 1 H-NMR (CDCl 3 , 400MHz): δ2.17(6H,s), 2.99(6H,s), 6.60~7.34(4H,m); m...
Embodiment 2
[0042] A kind of preparation method of ropivacaine hydrochloride impurity as the embodiment of the present invention, described method comprises the following steps:
[0043] (1) 5.2 g of 2,6-dimethylaniline (0.043 mol), 13.0 g of thionyl chloride (0.085 mol) and 40 mL of N,N-dimethylformamide were mixed and stirred until the reaction was completed, and the point The plate method judges the end of the reaction;
[0044] (2) adding water to the reaction system after the reaction in step (1) to quench and adjust the pH value to 10 with sodium hydroxide and extract with dichloromethane;
[0045] (3) Combine the organic phases, spin dry, add 20ml of acetone and heat until completely dissolved, cool to 10-20°C to crystallize, filter and dry to obtain light yellow solid powder.
[0046] After determination, the present embodiment prepares 3.6 g of light yellow solid powder with a purity of 96.5%. After mass spectrometry and nuclear magnetic detection, the result is 1 H-NMR (CDCl ...
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