反应详情

To a suspension of 3-hydroxyanthranilic acid (0.153 g, 1.0 mmol) in toluene (10 mL) was added 4-fluorobenzoyl chloride (0.475 g, 3.0 mmol) followed by pyridine (0.275 g, 3.5 mmol) at room temperature. The resulting mixture was stirred at room temperature for 30 minutes then heated to 80° C. for 1 hr. After this time the reaction was cooled and poured into a mixture of ethyl acetate (50 mL) and 5% aqueous hydrochloric acid (20 mL). Subsequent separation of the layers, drying the organic over MgSO4 and filtration afforded a solution. After removal of the solvent, the residue was dissolved in toluene (20 mL) and the solution treated with 4-methylbenzenesulfonic acid (0.4 g, 2.1 mmol). The reaction mixture was then heated to reflux overnight. After this time the reaction was cooled and poured into water (100 mL), the organic layer was separated, washed with water (100 mL), dried over anhydrous magnesium sulfate and concentrated to give a solid. Re-crystallization of this solid from acetate gave 2-(4-fluorophenyl)benzo[d]oxazole-4-carboxylic acid as a white solid product (0.064 g, yield 24.9%). LC-MS (ESI) m/z 258 [M+1]+.

1. temperaturethen heated to 80° C. for 1 hr
2. temperatureAfter this time the reaction was cooled
3. customSubsequent separation of the layers
4. customdrying the
5. filtrationorganic over MgSO4 and filtration
6. customafforded a solution
7. customAfter removal of the solvent
8. dissolutionthe residue was dissolved in toluene (20 mL)
9. temperatureThe reaction mixture was then heated
10. temperatureto reflux overnight
11. temperatureAfter this time the reaction was cooled
12. customthe organic layer was separated
13. washwashed with water (100 mL)
14. dry with materialdried over anhydrous magnesium sulfate
15. concentrationconcentrated
16. customto give a solid