Dimethyl Sulfoxide → tert-Butyl 3-oxo-2-phenylpiperidine-1-carboxylate

Temperatur

-60 °C

To a cooled (-60° C.) solution of oxalyl chloride (0.68 ml, 7.8 mmol) in dichloronmethane (17 ml) was added dimethyl sulphoxide (0.69 ml, 9.8 mmol) for 10 minutes before addition of (±)1-tert-butoxycarbonyl-3-hydroxy-2-phenylpiperidine (1.8 g, 6.5 mmol; prepared by the method described in European Patent Specification number 0 528 495-A) in dichloromethane (7 ml). The solution was stirred at -60° C. for 20 minutes, warmed to -30° C. and triethylamine (2.5 ml) added. The solution was warmed to room temperature then was washed with ice cold 10% aqueous citric acid solution (40 ml, twice), water and dried (MgSO4). After evaporation the residue was purified by chromatography on silica gel (eluting with hexane containing an increasing proportion of ethyl acetate up to 20%) to give the title compound.

1. customprepared by the method
2. temperaturewarmed to -30° C.
3. temperatureThe solution was warmed to room temperature
4. washthen was washed with ice cold 10% aqueous citric acid solution (40 ml
5. dry with materialtwice), water and dried (MgSO4)
6. customAfter evaporation the residue
7. customwas purified by chromatography on silica gel (
8. washeluting with hexane containing an increasing proportion of ethyl acetate up to 20%)

ORD-Eintrag

ord-7bfb5fe95396445f8219e89207c58322

Quelldatensatz

uspto-grants-2000_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06060469