反应详情

温度

0 °C

To a solution of tert-butyl [(1R)-2-hydroxy-1-phenylethyl]carbamate (200 mg, 0.844 mmol) in CH2Cl2 (20 mL) at 0° C. was added Dess-Martin periodinane (447 mg, 1.05 mmol). The reaction was stirred at 0° C. for 15 minutes and then at room temperature for 30 minutes. The reaction was then diluted with EtOAc (75 mL) and washed rapidly with 10% K2CO3 (2×30 mL). The organic layer was dried over Na2SO4, filtered, and concentrated. Purification of the residue on a short column of silica gel with 50% EtOAc/hexanes gave tert-butyl [(1R)-2-oxo-1-phenylethyl]carbamate. 1H NMR (CDCl3, 600 MHz) (a major and a minor conformer observed). Data for major conformer given) δ 9.53 (s, 1H), 7.29-740 (m, 5H), 5.80 (bs, 1H), 5.31 (m, 1H), 1.42 (s, 91-1). This material was used immediately in the following reaction.

1. waitat room temperature for 30 minutes
2. washwashed rapidly with 10% K2CO3 (2×30 mL)
3. dry with materialThe organic layer was dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated
6. customPurification of the residue on a short column of silica gel with 50% EtOAc/hexanes