反应详情

温度

50 °C

To a solution of (S)-ethyl 2-(methylsulfonyloxy)propanoate (28.4 g, 0.1 mol) in N,N′-dimethylformamide (400 mL) was added dibenzyl malonate (23.5 g, 0.12 mol) and cesium fluoride (15.2 g, 0.1 mol). The mixture was heated at 50° C. for 2 days. After cooled to room temperature, the mixture was poured into water and then extracted with ethyl acetate. The organic phases were combined, washed with brine, water and dried over anhydrous sodium sulfate, and then concentrated to afford the crude product (S)-1,1-dibenzyl 2-ethyl propane-1,1,2-tricarboxylate, which was purified by silica gel chromatography (23 g, yield 60%).

1. temperatureAfter cooled to room temperature
2. extractionextracted with ethyl acetate
3. washwashed with brine, water
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated