反应详情

温度

0 °C

4-Dimethylaminopyridine (2.55 g, 21.3 mmol) and triethylamine (46.9 ml, 340.8 mmol) in dichloromethane (100 ml) are added to a solution of (S)-(−)-4-benzyl-2-oxazolidinone (37.7 g, 213 mmol) in dichloromethane (300 ml). Next, isovaleroyl chloride (33.75 ml, 207 mmol) in dichloromethane (50 ml) is added to the previously prepared mixture and cooled to 0° C. keeping the internal temperature below 10° C. The reaction mixture is stirred for 30 minutes at 10° C., then the formed salts are filtered. Water (100 ml) is added and the phases are separated. The organic phase is washed with water (100 ml) and brine (100 ml), dried over sodium sulphate and evaporated to dryness obtaining 53 g of a yellow oil, which solidifies over time (yield 95%).

1. customthe internal temperature below 10° C
2. filtrationthe formed salts are filtered
3. additionWater (100 ml) is added
4. customthe phases are separated
5. washThe organic phase is washed with water (100 ml) and brine (100 ml)
6. dry with materialdried over sodium sulphate
7. customevaporated to dryness