Diisopropylethylamine → 5-Benzyl-3-(4-bromophenyl)-1,3-oxazolan-2-one

温度

0 °C

A solution containing 1-(4-bromoanilino)-3-phenyl-2-propanol (1.90 g, 0.00621 mol), N,N-diisopropylethylamine (2.48 g, 0.0193 mol) and N,N-dimethylaminopyridine (0.152 g, 0.00124 mol) in anhydrous dichloromethane (64 mL) was cooled to 0° C. and the solution of triphosgene (0.92 g, 0.0031 mol) in anhydrous dichloromethane (16 mL) was added dropwise. The reaction mixture was slowly warmed up to ambient temperature while stirring under an atmosphere of nitrogen for 18 hours. The organic phase was washed with saturated solution of sodium bicarbonate in water (70 mL), brine (60 mL) and dried with magnesium sulfate. The solvent was removed under reduced pressure and the residue purified by flash chromatography on silica using ethyl acetate/n-heptane (1:5) as mobile phase to yield 5-benzyl-3-(4-bromophenyl)-1,3-oxazolan-2-one (1.25 g, 0.00377 mol) as a white solid.

1. temperatureThe reaction mixture was slowly warmed up to ambient temperature
2. washThe organic phase was washed with saturated solution of sodium bicarbonate in water (70 mL), brine (60 mL)
3. dry with materialdried with magnesium sulfate
4. customThe solvent was removed under reduced pressure
5. customthe residue purified by flash chromatography on silica

ORDレコード

ord-02b8f9dae8824ecb9b9fa269f4090091

出典データセット

uspto-grants-2005_07

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US06921763B2