| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for producing N-[(R)-1-(2,4-dichlorophenyl) ethyl]-(S)-2-cyano-3,3-dimethylbutanamide in high efficiency. SOLUTION: This process for the production of N-[(R)-1-(2,4-dichlorophenyl) ethyl]-(S)-2-cyano-3,3-dimethylbutanamide comprises the crystallization of a mixture of N-[(R)-1-(2,4-dichlorophenyl)ethyl]-(R)-2-cyano-3,3-dimethylbutanamide and N-[(R)-1-(2,4-dichlorophenyl)ethyl]-(S)-2-cyano-3,3-dimethylbutanamide or N-[(R)-1-(2,4-dichlorophenyl)ethyl]-(R)-2-cyano-3,3-dimethylbutanamide under basic condition. |
