2544-12-9Relevant academic research and scientific papers
L - 3 - (3, 4 - dimethoxyphenyl) -2 - amino -2 - methyl propionitrile hydrochloride preparation method
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Paragraph 0024; 0028-0030; 0032; 0036-0038; 0040; 0044-0046, (2017/06/02)
The invention relates to the technical field of medical chemistry and aims at providing a method for preparing L-3-(3,4-dimethoxyphenyl)-2-amino-2-methyl propionitrile hydrochloride. The method comprises the following steps: adding veratone, sodium cyanide, ammonium chloride and ammonia water into a reaction kettle, and introducing ammonia gas; cooling and performing centrifugal separation after the reaction is ended, thereby obtaining D,L-aminopropionitrile; dissolving the D,L-aminopropionitrile in an organic solvent, adding L(+)-2,3-dihydrobutanedioic acid, stirring and reacting; adding hydrochloric acid for stirring, and cooling for performing centrifugal separation treatment, thereby obtaining the L-3-(3,4-dimethoxyphenyl)-2-amino-2-methyl propionitrile hydrochloride. According to the method disclosed by the invention, the conversion rate of veratone is high and can be 90-95 percent. The ammonia water mother solution and organic solvent produced in the reaction can be recycled and are repeatedly used for many times, and the environmental pollution is reduced. The solvent used in the reaction replaces water, and sewage emission is completely reduced. The amount of a resolving agent can be reduced by a half, and the resolving effect is good; complex operations such as regulation of the pH value and the like are not needed, and the preparation process is stable and easy to operate.
