反应详情

温度

0 °C

2M trimethylaluminum toluene solution (90 ml, 180 mmol) was added to a THF (180 ml) solution of N,O-dimethylhydroxyamine hydrochloride (18.3 g, 187.6 mmol) at −10° C. under stirring. After the reaction solution was warmed to 0° C. and stirred for 10 minutes, it was warmed to room temperature and further stirred for 30 minutes. The reaction solution was cooled to −10° C. again, and a THF-dichloromethane solution (4:5, 180 ml) of (4R)-4-benzyl-3-[(2R,3S)-3-hydroxy-2-methylpentanoyl]-1,3-oxazolidin-2-one (21.85 g, 75 mmol) was added dropwise to the reaction solution. After the reaction solution was warmed to 0° C. and stirred for two hours, a mixed solution of dichloromethane −0.5N hydrochloric acid (1:1, 80 ml) was added slowly, and the mixture was stirred for one hour at 0° C. The reaction solution was filtered through celite and the filtrate was dried over anhydrous sodium sulfate. After the drying agent was filtered off, the organic layer was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (Merck, commercial name Silica Gel 60; heptane:ethyl acetate=1.5:1) to obtain (2R,3S)-3-hydroxy-N-methoxy-N,2-dimethylpentanamide (13.0 g) as a colorless oil.

1. stirringstirred for 10 minutes
2. temperatureit was warmed to room temperature
3. stirringfurther stirred for 30 minutes
4. temperatureThe reaction solution was cooled to −10° C. again
5. temperatureAfter the reaction solution was warmed to 0° C.
6. stirringstirred for two hours
7. stirringthe mixture was stirred for one hour at 0° C
8. filtrationThe reaction solution was filtered through celite
9. dry with materialthe filtrate was dried over anhydrous sodium sulfate
10. filtrationAfter the drying agent was filtered off
11. concentrationthe organic layer was concentrated under reduced pressure
12. customThe obtained residue was purified by silica gel column chromatography (Merck, commercial name Silica Gel 60; heptane:ethyl acetate=1.5:1)