反应详情

To a solution of 9 g (26.5 mmole) [(S)-2-(4-tert-butylphenyl)-1-methyl-2-oxoethyl]-carbamic acid benzyl ester o in 40 mL toluene and 10 mL 2-propanol was added dropwise a solution of 0.7 g (18.42 mmole) sodium borohydride in 2 mL water containing 1 drop 50% sodium hydroxide. The reaction mixture was stirred at room temperature for 15 hrs. The layers were separated and the organic phase was washed with 25 mL 10% sodium hydroxide. 2-Propanol was removed under reduced pressure and the remaining toluene solution was heated under reflux for 1 hr. The solvent was removed under reduced pressure. The residue was recrystallized from diethyl ether/hexane to provide (4S,5S)-5-(4-tert-butylphenyl)-4-methyl-oxazolidin-2-one p, 3 g; m.p. 199–200° C.

1. customThe layers were separated
2. washthe organic phase was washed with 25 mL 10% sodium hydroxide
3. custom2-Propanol was removed under reduced pressure
4. temperaturethe remaining toluene solution was heated
5. temperatureunder reflux for 1 hr
6. customThe solvent was removed under reduced pressure
7. customThe residue was recrystallized from diethyl ether/hexane