反应详情

3-(1-tert-Butoxycarbonyl-1-methylethoxy)phenylacetic acid (2.0 g, 6.79 mmol) is dissolved in acetonitrile (15 mL). Subsequently, pyridine (0.34 mL, 4.22 mmol) and ammonium hydrogencarbonate (699 mg, 8.84 mmol) were added thereto, and the mixture was stirred for 10 minutes at room temperature. Thereafter, di-tert-butyl dicarbonate [Boc2O (2.03 mL, 8.84 mmol)] was added thereto, and the resultant mixture was stirred for 14 hours. The reaction mixture was concentrated under reduced pressure. Thereafter, the resultant concentrate was added to water, and the mixture was extracted with chloroform, followed by washing sequentially with 1M hydrochloric acid and saturated brine. The resultant mixture was subjected to drying over magnesium sulfate, concentration under reduced pressure, and purification by silica gel column chromatography (chloroform/methanol=10/1), whereby the target compound was obtained (1.07 g, 3.65 mmol, 53.6%).

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. concentrationThereafter, the resultant concentrate
3. additionwas added to water
4. extractionthe mixture was extracted with chloroform
5. washby washing sequentially with 1M hydrochloric acid and saturated brine
6. dry with materialto drying over magnesium sulfate, concentration under reduced pressure, and purification by silica gel column chromatography (chloroform/methanol=10/1), whereby the target compound
7. customwas obtained (1.07 g, 3.65 mmol, 53.6%)