反应详情

A solution consisting of 1.75 g (3.44 mmol) of tert-butyl N-(3,4-bis-difluoromethoxyphenyl)-N-(3-pyridylmethyl)-4-aminobenzoate, 33.5 mL of dichloromethane and 8.4 mL of trifluoroacetic acid was stirred at room temperature for 5 hours. The solution was washed with 50 mL of H2O. Then 50 mL of H2O was added and the pH adjusted to 6 by the addition of 10% aqueous NaOH. The combined aqueous layers were extracted with 2×50 mL of dichloromethane. The combined dichloromethane extracts were evaporated and the remaining material was purified by flash chromatography over SiO2 using 10% MeOH in CH2Cl2 as eluant. The material was triturated with CH3CN to yield 1.09 g (73% yield) of the title compound as a white crystalline powder. [MW 436.359; ESMS m/z (M+H)+].

1. washThe solution was washed with 50 mL of H2O
2. additionThen 50 mL of H2O was added
3. additionthe pH adjusted to 6 by the addition of 10% aqueous NaOH
4. extractionThe combined aqueous layers were extracted with 2×50 mL of dichloromethane
5. customThe combined dichloromethane extracts were evaporated
6. customthe remaining material was purified by flash chromatography over SiO2 using 10% MeOH in CH2Cl2 as eluant
7. customThe material was triturated with CH3CN