反应详情

温度

22 °C

A solution of (S)-(+)-2,2-dimethyl-5-oxo-1,3-dioxolane-4-acetic acid (13.20 g, 75.8 mmol), which was derived from L-malic acid by means known in the art, in N,N-dimethylformamide (25 ml) was treated at 22° C. with imidazole (10.56 g, 0.155 mmol) followed by tert-butyldimethylsilyl chloride (12.0 g, 79.6 mmol) and the resulting mixture was stirred at 22° C. for 18 h. The reaction mixture was then diluted with toluene (500 ml), washed with water (×3), saturated sodium bicarbonate and brine. After drying (magnesium sulfate), the solvent was evaporated under reduced pressure to give an oil. Distillation under vacuum gave 20.9 g (96%) of the title material as a clear oil: Bp 80-90° C./0.1 torr (bulb to bulb distillation, air bath temperature). 1H NMR (400 MHz, CDCl3) δ: 0.33 (s, 3), 0.36 (s, 3), 1.00 (s, 9), 1.11 (s, 3), 1.37 (s, 3), 2.72 (m, 2), 4.35 (dd, 1, J=4, 6).

1. washwashed with water (×3), saturated sodium bicarbonate and brine
2. dry with materialAfter drying (magnesium sulfate)
3. customthe solvent was evaporated under reduced pressure
4. customto give an oil
5. distillationDistillation under vacuum