反应详情

温度

20 °C

To a mixture of (R)-2-hydroxybutyramide (4.2 g, 40.7 mmol) and triethylamine (6.2 ml, 44.8 mmol, 1.1 equiv.) in tetrahydrofuran (50 ml) is added drop wise at −40° C. methanesulfonic acid chloride (3.5 ml, 44.8 mmol, 1.1 equiv.). The mixture is allowed to warm to 20° C. and is filtered over magnesium sulfate (8 g). The cake is rinsed twice with tetrahydrofuran (2×20 ml) and combined filtrates are concentrated to dryness under reduced pressure to afford methanesulfonic acid (R)-1-carbamoyl-propyl ester (IIi) as a solid. (7.9 g, 106%, triethylamine hydrochloride salts are present).

1. filtrationis filtered over magnesium sulfate (8 g)
2. washThe cake is rinsed twice with tetrahydrofuran (2×20 ml)
3. concentrationare concentrated to dryness under reduced pressure