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温度

0 °C

To a solution of N-[2,6-dimethyl-4-(1,2,2,2-tetrafluoro-1-trifluoromethyl-ethyl)-phenyl]-3-nitro-2,4,5-trifluoro-benzamide (6.77 g, 13.75 mmol) (Example I15) in N,N-dimethylformamide (137 ml) at 0° C. was added sodium cyanide (740 mg, 15.13 mmol). The reaction mixture was stirred at 0° C. for one hour and then at ambient temperature for 16 hours. The reaction mixture was concentrated and the residue partitioned between water and dichloromethane. The combined organic phases were dried over sodium sulfate and concentrated. The residue was purified by column chromatography on silica gel (eluent: cyclohexane/ethyl acetate 8:2) to give 4-cyano-2,5-difluoro-N-[2,6-dimethyl-4-(1,2,2,2-tetrafluoro-1-trifluoromethyl-ethyl)-phenyl]-3-nitro-benzamide (3.2 g, 46.6% yield). 1H-NMR (400 MHz, CDCl3): 2.35 (6H, s), 7.38 (2H, s), 7.83 (1H, d), 8.29 (1H, m) ppm.

1. customat 0° C.
2. waitat ambient temperature for 16 hours
3. concentrationThe reaction mixture was concentrated
4. customthe residue partitioned between water and dichloromethane
5. dry with materialThe combined organic phases were dried over sodium sulfate
6. concentrationconcentrated
7. customThe residue was purified by column chromatography on silica gel (eluent: cyclohexane/ethyl acetate 8:2)