反应详情

Lithium aluminium hydride (53 mg, 1.42 mmol) was added to a solution of methyl ester of [2-(4-pyridyl)-benzoxazol-7-yl]carboxylic acid (360 mg, 1.42 mmol) in tetrahydrofuran (15 ml) with stirring under ice cooling in 10 min. and the mixture was stirred at the same temperature for 0.5 hrs. To the reaction mixture were added dropwise at the same temperature 10% aqueous tetrahydrofuran (2 ml) and 30% aqueous solution of sodium hydroxide (0.5 ml) in turn, and the mixture was stirred at room temperature for 2 hrs. The resultant insoluble materials were filtered off, and the solvent was distilled off from the filtrate under reduced pressure. The residue was diluted with ethyl acetate and washed with water and brine in turn and then dried. The solvent was distilled off under reduced pressure, and the resultant crystals were triturated with a mixture of n-hexane/diisopropyl ether (1/1), filtered and dried to give [2-(4-pyridyl)-benzoxazol-7-yl]methanol (216 mg, 67%) as colorless crystals.

1. stirringthe mixture was stirred at the same temperature for 0.5 hrs
2. stirringthe mixture was stirred at room temperature for 2 hrs
3. filtrationThe resultant insoluble materials were filtered off
4. distillationthe solvent was distilled off from the filtrate under reduced pressure
5. additionThe residue was diluted with ethyl acetate
6. washwashed with water and brine in turn
7. customdried
8. distillationThe solvent was distilled off under reduced pressure
9. customthe resultant crystals were triturated with a mixture of n-hexane/diisopropyl ether (1/1)
10. filtrationfiltered
11. customdried