反应详情

The compound (350 mg, 0.908 mmol) obtained in Example 5b was dissolved in tetrahydrofuran (4 mL), a borane-tetrahydrofuran complex (1.0 M tetrahydrofuran solution; 3.18 mL, 3.18 mmol) was added under ice cooling, and then the mixture was stirred at room temperature for 45 minutes. Methanol (1 mL) was added under ice cooling, and the mixture was stirred at room temperature for 1 hour. The solvent was evaporated under reduced pressure, and the resulting residue was purified by NH silica gel column chromatography (ethyl acetate:methanol=100:0→20:1, v/v) to give the title compound (124 mg; yield, 37%) as a colorless oily substance.

1. stirringthe mixture was stirred at room temperature for 1 hour
2. customThe solvent was evaporated under reduced pressure
3. customthe resulting residue was purified by NH silica gel column chromatography (ethyl acetate