Hydrochloric Acid → (6S)-6-(4-bromophenyl)-4-((1R)-1-phenylethyl)morpholin-3-one

Participants

Reaction Steps

A solution of chloroacetyl chloride (19.5 ml, 245 mmol) in dichloromethane (100 ml) was added dropwise to a ice-cooled solution of (1S)-1-(4-bromophenyl)-2-((1R)-1-phenylethylamino)ethanol (intermediate 5, 71.0 g, 222 mmol) and triethylamine (34 ml, 245 mmol) in dichloromethane (600 ml). After the mixture was stirred for 2 hours, 1 M hydrochloric acid was added and the mixture was partitioned between water and chloroform. The organic layer was washed with saturated aqueous sodium hydrogen carbonate and brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure and the residue was dissolved in 2-propanol (600 ml). The solution was added with potassium hydroxide (85%, 18.3 g, 278 mmol). The mixture was stirred at room temperature for 15 hours. The solvent was evaporated under reduced pressure and the residue was added with ethyl acetate. The mixture was partitioned between water and ethyl acetate, and the organic layer was washed with 1 M hydrochloric acid, saturated aqueous sodium hydrogen carbonate and brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give (6S)-6-(4-bromophenyl)-4-((1R)-1-phenylethyl)morpholin-3-one (intermediate 6, 92 g) as a brown oil. This crude product was used for next reaction without purification.

Provenance & Evidence