反应详情

To a solution of 6-bromo-4-phenyl-3-isocoumarincarboxylic acid (1.00 g) in methanol (20 ml) was added benzylamine (3.16 ml) and the mixture was stirred at room temperature for 2 hrs. The solvent was evaporated under reduced pressure and 1N hydrochloric acid was added. The mixture was extracted with ethyl acetate. The extract was washed successively with 1N hydrochloric acid and saturated brine and magnesium sulfate was added to dry the mixture. The solvent was evaporated under reduced pressure, and 4N hydrogen chloride-ethyl acetate solution (17 ml) was added to the obtained residue, and the mixture was stirred at room temperature for 18 hrs. The solvent was evaporated under reduced pressure, and addition of water allowed crystal precipitation. The obtained crystals were collected by filtration, washed successively with water and ether and dried under reduced pressure at 50° C. to give the title compound (921 mg, 73%).

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 successively with 1N hydrochloric acid and saturated brine and magnesium sulfate
5. additionwas added
6. customto dry the mixture
7. customThe solvent was evaporated under reduced pressure, and 4N hydrogen chloride-ethyl acetate solution (17 ml)
8. additionwas added to the obtained residue
9. stirringthe mixture was stirred at room temperature for 18 hrs
10. customThe solvent was evaporated under reduced pressure, and addition of water allowed crystal precipitation
11. filtrationThe obtained crystals were collected by filtration
12. washwashed successively with water and ether
13. customdried under reduced pressure at 50° C.