反应详情

温度

22 °C

Add 5 N aqueous sodium hydroxide (60 mL, 0.3 mol) to a solution of 5,6-Dihydro-4H-pyrrolo[3,2,1-ij]quinoline-1-carboxylic acid ethyl ester (31 g, 0.14 mol) in ethanol (200 mL) and water (70 mL) and stir the resulting mixture at reflux for 3 hours. Cool the reaction mixture to 20-24° C., dilute with water (2 L), and wash sequentially with dichloromethane (2×200 mL) and diethyl ether (1×200 mL). Filter the aqueous layer through Celite and treat the filtrate with concentrated hydrochloric acid (25 mL) to precipitate the product. Filter the solid, wash with water (200 mL), and dry under reduced pressure to give the desired compound as a light yellow solid (23.2 g, 85%).

1. temperatureat reflux for 3 hours
2. washwash sequentially with dichloromethane (2×200 mL) and diethyl ether (1×200 mL)
3. filtrationFilter the aqueous layer through Celite
4. additiontreat the filtrate with concentrated hydrochloric acid (25 mL)
5. customto precipitate the product
6. filtrationFilter the solid
7. washwash with water (200 mL)
8. customdry under reduced pressure