反应详情

To a solution of 6-bromo-4-phenyl-3-isocoumarincarboxylic acid methyl ester (3.60 g) in methanol (50 ml) was added 4-aminomethylbenzoic acid methyl ester (3.16 ml) and the mixture was stirred at room temperature for 18 hrs. The solvent was evaporated under reduced pressure and 1N hydrochloric acid was added, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine and dried by adding sodium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was dissolved in methanol (100 ml). Conc. sulfuric acid (10 ml) was added, and the mixture was heated under reflux for 3 hr. The solvent was evaporated under reduced pressure, water was added under ice-cooling and the mixture was neutralized with potassium carbonate. The solution was extracted with ethyl acetate and the extract was washed with saturated brine. Sodium sulfate was added to dry the mixture. The obtained residue was recrystallized from methanol to give the title compound (3.39 g, 67%).

1. customThe solvent was evaporated under reduced pressure and 1N hydrochloric acid
2. additionwas added
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with saturated brine
5. customdried
6. additionby adding sodium sulfate
7. customThe solvent was evaporated under reduced pressure
8. dissolutionthe obtained residue was dissolved in methanol (100 ml)
9. additionConc. sulfuric acid (10 ml) was added
10. temperaturethe mixture was heated
11. temperatureunder reflux for 3 hr
12. customThe solvent was evaporated under reduced pressure, water
13. additionwas added under ice-
14. temperaturecooling
15. extractionThe solution was extracted with ethyl acetate
16. washthe extract was washed with saturated brine
17. additionSodium sulfate was added
18. customto dry the mixture
19. customThe obtained residue was recrystallized from methanol