反应详情

温度

-10 °C

(R)-2-Acetylamino-3-methoxypropionic acid (8.06 g, 0.05 mol) was dissolved in tetrahydrofuran (80 mL). Isobutyl chloroformate (7.8 mL, 0.06 mol) was added at −10° C. within 10 minutes, followed by 4-methylmorpholine (6.6 mL, 0.06 mol), and the mixture was stirred at −10° C. for 40 minutes. A solution of benzylamine (6.55 mL, 0.06 mol) in tetrahydrofuran (10 mL) was then added at −10° C. The mixture was allowed to warm to room temperature, the solvent evaporated and the residue dissolved in dichloromethane. The solution was successively washed with water (30 mL), 1M HCl (30 mL), 5% sodium hydrogencarbonate solution (30 mL) and again with water (30 mL). The solvent was evaporated and the residue crystallized in ethyl acetate to afford the title compound (7.09 g, 57%). LCMS analysis: 98.0%.

1. temperatureto warm to room temperature
2. customthe solvent evaporated
3. dissolutionthe residue dissolved in dichloromethane
4. washThe solution was successively washed with water (30 mL), 1M HCl (30 mL), 5% sodium hydrogencarbonate solution (30 mL) and again with water (30 mL)
5. customThe solvent was evaporated
6. customthe residue crystallized in ethyl acetate