反应详情

To a stirred suspension of isatoic anhydride (1.63 g, 10 mmol) in 15 mL dioxane at room temperature under nitrogen was added powdered sodium hydroxide followed by 3-fluoro-4-methoxyaniline (1.41 g, 10 mmol). The mixture was immersed in a room temperature oil bath and slowly heated to reflux. Carbon dioxide gas evolution was evident. After stirring at reflux for 2 hours, the reaction mixture was cooled to room temperature and inorganics were filtered off with dioxane. The filtrate was concentrated to dryness to a brown solid. The crude product was dissolved in a minimum of hot 95% EtOH and crystals formed upon cooling. The crystals were filtered off and rinsed with a minimum of ice cold 95% EtOH to give a tan solid (1.0 g, 39%). 1H-NMR (400 MHz, CDCl3) δ 7.66 (br s, 1H), 7.50 (dd, 1H), 7.44 (dd, 1H), 7.26 (m, 1H), 7.17 (m, 1H), 6.95 (m, 1H), 6.71 (m, 2H), 5.50 (br s, 2H), 3.89 (s, 3H).

1. additionwas added
2. customwas immersed in a room temperature
3. temperatureslowly heated to reflux
4. temperatureat reflux for 2 hours
5. filtrationinorganics were filtered off with dioxane
6. concentrationThe filtrate was concentrated to dryness to a brown solid
7. dissolutionThe crude product was dissolved in a minimum of hot 95% EtOH and crystals
8. customformed
9. temperatureupon cooling
10. filtrationThe crystals were filtered off
11. washrinsed with a minimum of ice cold 95% EtOH