反应详情

To a solution in tetrahydrofuran (10 mL) of the compound (650 mg) obtained in step (1) above, sodium hydride (60% dispersion in mineral oil, 143 mg) was added under cooling with ice. After stirring the mixture at the same temperature for 10 minutes, methyl iodide (603 μL) was added. After stirring the mixture at the same temperature for 30 minutes and then at room temperature for an hour, water was added and extraction was conducted with ethyl acetate. The combined organic layers were passed through a phase separator and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=90:10-60:40) to give tert-butyl [(2S)-1-cyano-3-methoxypropan-2-yl]carbamate as a colorless oil (247 mg).

1. temperatureunder cooling with ice
2. stirringAfter stirring the mixture at the same temperature for 30 minutes
3. waitat room temperature for an hour
4. extractionextraction
5. concentrationconcentrated under reduced pressure
6. customThe resulting residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=90:10-60:40)