反应详情

To a cooled solution of 2-amino-2-(4-fluorophenyl)acetic acid (1.0 g, 6.17 mmol) in ethanol was added con. H2SO4 (1 mL) over a period of 1 min. The reaction mixture was heated at reflux for 5 h. The solvent was evaporated under reduced pressure and the residue was diluted with ethyl acetate (20 mL). The organic solution was washed with aqueous saturated NaHCO3 (15 mL×2), water (20 mL), brine solution (10 mL), dried over anhydrous Na2SO4 and evaporated under reduced pressure to give ethyl 2-amino-2-(4-fluorophenyl)acetate (0.75 g, 65%) as crude compound (oily liquid). The crude compound was taken to the next step without further purification. LC-MS (M+H2O)+=198.0. 1H NMR (400 MHz, DMSO-d6): δ 7.44-7.40 (2H, m), 7.18-7.13 (2H, m), 4.51 (1H, s), 4.12-4.01 (2H, m), 2.26 (2H, s), 1.12 (3H, t, J=8.0 Hz).

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for 5 h
3. customThe solvent was evaporated under reduced pressure
4. additionthe residue was diluted with ethyl acetate (20 mL)
5. washThe organic solution was washed with aqueous saturated NaHCO3 (15 mL×2), water (20 mL), brine solution (10 mL)
6. dry with materialdried over anhydrous Na2SO4
7. customevaporated under reduced pressure