反应详情

温度

80 °C

A saturated solution of HCl in ethanol (15 mL) is added to benzothiophene-5-carboxylic acid (1 g, 5.44 mmol) and the reaction mixture is stirred at 80° C. overnight. The solvent is removed under reduced pressure and diethyl ether and saturated sodium bicarbonate are added to the residue. The layers are separated. The organic layer is washed with saturated sodium bicarbonate and water, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to yield the title compound (1.0 g, 89%) as a pale brown oil. 1H NMR (CDCl3): δ 8.54 (s, 1H), 8.01 (d, 1H, J=8.1 Hz), 7.92 (d, 1H, J=8.1 Hz), 7.51 (d, 1H, J=5.4 Hz), 7.42 (d, 1H, J=5.4 Hz), 4.42 (c, 2H, J=6.8 Hz), 1.43 (t, 3H, J=6.8 Hz).

1. customThe solvent is removed under reduced pressure and diethyl ether and saturated sodium bicarbonate
2. additionare added to the residue
3. customThe layers are separated
4. washThe organic layer is washed with saturated sodium bicarbonate and water
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure