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温度

0 °C

To a solution of N-[2-ethyl-4-(1,2,2,3,3,3-hexafluoro-1-trifluoromethylpropyl)-6-methylphenyl]-2-methoxy-3-nitrobenzamide (Example I 4.1) (5.1 g, 9.57 mmol) in isopropanol (50 ml) was added tin chloride (6.5 g, 34.5 mmol) at ambient temperature. The mixture was cooled to 0° C. and concentrated aqueous hydrochloric acid (10 ml) was added slowly. The reaction mixture was stirred at 80° C. for 0.5 hours. One third of the total volume of isopropanol was evaporated. Water (100 ml) was added to the concentrated mixture and aqueous sodium hydroxide (4N) was added to adjust the pH to 7 to 8. The aqueous phase was extracted three times with ethyl acetate (3×200 ml). The combined organic extracts were dried over sodium sulfate and concentrated. The residue was purified by column chromatography on silica gel (eluent: cyclohexane/ethyl acetate 2:1 to 1:1) to give 3-amino-N-[2-ethyl-4-(1,2,2,3,3,3-hexafluoro-1-trifluoromethylpropyl)-6-methylphenyl]-2-methoxy benzamide (2.3 g, 48% yield).

1. customat ambient temperature
2. customOne third of the total volume of isopropanol was evaporated
3. additionWater (100 ml) was added to the concentrated mixture and aqueous sodium hydroxide (4N)
4. additionwas added
5. extractionThe aqueous phase was extracted three times with ethyl acetate (3×200 ml)
6. dry with materialThe combined organic extracts were dried over sodium sulfate
7. concentrationconcentrated
8. customThe residue was purified by column chromatography on silica gel (eluent: cyclohexane/ethyl acetate 2:1 to 1:1)