反应详情

温度

0 °C

In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a suspension of 5-(3-carboxy-phenyl)-oxazole-4-carboxylic acid methyl ester (500 mg, 2.02 mmol) in THF (14.0 mL) at 0° C. was treated dropwise with BH3 (10.1 mL of a 1M solution in THF, 10.11 mmol). The resulting mixture was stirred at 0° C. for 4 h. MeOH (14 mL) was then added dropwise. After 30 min, the solvent was removed under reduced pressure. EA (20 mL) was added and the organic phase was washed with 1N NaOH (10 mL), water (10 mL) and brine (10 mL). The organic layer was dried over MgSO4, filtered, and the solvent removed under reduced pressure. Purification of the residue by FC (93:7 CH2Cl2-MeOH) gave the title compound as a white solid. TLC:rf (93:7 CH2Cl2-MeOH)=0.32. LC-MS-conditions 02: tR=0.76 min, [M+H]+=234.39.

1. waitAfter 30 min
2. customthe solvent was removed under reduced pressure
3. additionEA (20 mL) was added
4. washthe organic phase was washed with 1N NaOH (10 mL), water (10 mL) and brine (10 mL)
5. dry with materialThe organic layer was dried over MgSO4
6. filtrationfiltered
7. customthe solvent removed under reduced pressure
8. customPurification of the residue by FC (93:7 CH2Cl2-MeOH)