反应详情

A suspension of 4-(1-acetamido-1-methylethyl)benzoic acid (73.4 g) and sulfuric acid (0.7 ml) in methanol (370 ml) was refluxed for 16 hr. The solvent was evaporated and 10% aqueous sodium hydrogencarbonate (500 ml) was added and the mixture was extracted with ethyl acetate (500 ml). The extract was washed with saturated brine and dried over anhydrous magnesium sulfate. The solvent was evaporated and the obtained residue was recrystallized from ethyl acetate-isopropyl ether to give the title compound (39.0 g) as pale-yellow crystals, m.p.=165-167° C.

1. temperaturewas refluxed for 16 hr
2. customThe solvent was evaporated
3. addition10% aqueous sodium hydrogencarbonate (500 ml) was added
4. extractionthe mixture was extracted with ethyl acetate (500 ml)
5. washThe extract was washed with saturated brine
6. dry with materialdried over anhydrous magnesium sulfate
7. customThe solvent was evaporated
8. customthe obtained residue was recrystallized from ethyl acetate-isopropyl ether