反应详情

A mixture of 5a (0.81 g, 5 mmol) in acetic anhydride (20 ml) was heated at reflux for 2 h (monitored by TLC). After cooling, it was poured into ice water (100 ml). The resulting solid was collected and crystallized from dichloromethane to give 2-Acetoxy-8-hydroxyquinoline (5b) (0.85 g, 84%) as white crystals. mp: 240°-241° C.; 1H-NMR (DMSO-d6): δ2.55; (s, 3H, CH3), 6.66 (d, 3-H), 7.15-7.23 (m, 3H, Ar--H), 7.78 (d, 4-H), 11.31 (br s, 1H, OH).

1. temperaturewas heated
2. temperatureat reflux for 2 h (monitored by TLC)
3. temperatureAfter cooling
4. customThe resulting solid was collected
5. customcrystallized from dichloromethane