反应详情

温度

0 °C

To a cold solution of (R)-3-Benzyloxyamino-2-pentylpropionic acid (1.03 g, 3.89 mmol) in HCO2H (19 mL) and dichloromethane (19 mL) at 0° C. was added acetic anhydride (3.9 mL, 41.2 mmol). The mixture was stirred at 0° C. for 3 hours. The volatiles were removed by evaporation under vacuum. Dichloromethane (50 mL) was added to it. It was washed with brine (50 mL×2), and dried over MgSO4. Filtration and evaporation under vacuum provided the title compound (1.08 g, 95%). 1H NMR (400 MHz, CHCl3) δ 8.07 (br s, 1H), 7.29 (m, 5H), 4.91–4.71 (m, 2H), 3.76 (m, 2H), 2.67 (m, 1H), 1.54 (m, 1H), 1.41 (m, 1H), 1.20 (m, 6H), 0.80 (t, J=7.0 Hz, 3H). Mass spectrum ES+: 294 [M+H]+.

1. customThe volatiles were removed by evaporation under vacuum
2. additionDichloromethane (50 mL) was added to it
3. washIt was washed with brine (50 mL×2)
4. dry with materialdried over MgSO4
5. filtrationFiltration and evaporation under vacuum