反应详情

30 ml of 10% hydrogen chloride-methanol was added to 1.59 g (7.46 mmol) of 4-(phenylamino)benzoic acid and the mixture was refluxed overnight under heating. After the reaction mixture was concentrated under reduced pressure, the residue was dissolved in ethyl acetate, washed with a sodium hydrogencarbonate aqueous solution and brine, and dried (MgSO4). The solvent was distilled off and the residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=5:1 (v/v)) to obtain 1.66 g (7.30 mmol) of methyl 4-(phenylamino)benzoate as a pale yellow solid. Its spectroscopic data are as follows:

1. temperaturethe mixture was refluxed overnight
2. temperatureunder heating
3. concentrationAfter the reaction mixture was concentrated under reduced pressure
4. dissolutionthe residue was dissolved in ethyl acetate
5. washwashed with a sodium hydrogencarbonate aqueous solution and brine
6. dry with materialdried (MgSO4)
7. distillationThe solvent was distilled off
8. customthe residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=5:1 (v/v))