Methane → (S)-4-cyclohexyloxazolidin-2-one

Temperatur

50 °C

Diphosgene (0.704 mL, 6.05 mmol) was added dropwise to a stirred suspension of (S)-2-amino-2-cyclohexylethanol (1.02 g, 7.12 mmol), Et3N (6.95 mL, 49.9 mmol) and activated charcoal (40 mg) in THF (20 mL) at 0° C. under N2. The reaction mixture was heated at 50° C. overnight. After cooling, the suspension was filtered through Celite. To the filtrate was added sat. aq. NaHCO3 solution. The mixture was extracted with EtOAc. The combined organic layers were washed with brine, dried and concentrated. The residue was purified by silica gel flash column chromatography (1:1 hexane/EtOAc) to give (S)-4-cyclohexyloxazolidin-2-one (0.900 g, 75%) as a white solid.

1. temperatureAfter cooling
2. filtrationthe suspension was filtered through Celite
3. additionTo the filtrate was added sat. aq. NaHCO3 solution
4. extractionThe mixture was extracted with EtOAc
5. washThe combined organic layers were washed with brine
6. customdried
7. concentrationconcentrated
8. customThe residue was purified by silica gel flash column chromatography (1:1 hexane/EtOAc)

ORD-Eintrag

ord-4e5c8185a12e4909944874703c91166a

Quelldatensatz

uspto-grants-2014_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08865726B2