反应详情

In THF/methanol (4:1, v/v, 100 ml) was dissolved methyl (2-(5-chloro-2-methylphenylamino)-7-fluoro-6-benzoxazolyl)acetate (1.67 g, 4.79 mmol). To the resulting solution was added 1N NaOH (40 ml). After stirring at room temperature for 12 hours, the reaction mixture was distilled under reduced pressure to remove the solvent. The residue was acidified with 1N HCl. The crystals thus precipitated were collected by filtration under reduced pressure, washed with water and dried under reduced pressure to give (2-(5-chloro-2-methylphenylamino)-7-fluoro-6-benzoxazolyl)acetic acid (1.39 g, 87%) as a colorless crystalline powder.

1. distillationthe reaction mixture was distilled under reduced pressure
2. customto remove the solvent
3. customThe crystals thus precipitated
4. filtrationwere collected by filtration under reduced pressure
5. washwashed with water
6. customdried under reduced pressure