Triethylamine → HCID 67282405, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of bromo-(3-bromo-phenyl)-acetic acid (27.8 g, 94.6 mmol) in dichloromethane (200 ml) was added oxalylchloride (19.8 g, 156 mmol) and a few drops of N,N-dimethylformamide at room temperature. After the mixture was stirred at 40° C. for one hour, the solvent was removed under reduced pressure. The residue was dissolved in dichloromethane (30 ml) and the solution was added to a solution of (R)-3-(1-phenylethyl amino)propan-1-ol (18.6 g, 104 mmol) and triethylamine (11.6 g, 114 mmol) in dichloromethane (312 ml) at 0° C. The mixture was stirred for 1.5 hours at 0° C. and partitioned between 0.5 N hydrochloric acid and dichloromethane. The organic layer was washed with brine, dried over sodium sulfate and concentrated in vacuo. The residue was dissolved into 2-propanol (312 ml) and then potassium hydroxide (11.7 g, 208 mmol) was added at 0° C. The mixture was stirred at 0° C. for 3 hours and partitioned between saturated ammonium chloride solution and dichloromethane. The organic layer was washed with brine, dried over sodium sulfate and concentrated in vacuo. The crude mixture was triturated with ether. The resulting solid materials were collected by filtration and dried under reduced pressure to afford diastereomerically pure 2-(3-bromo-phenyl)-4-((R)-1-phenyl-ethyl)-[1,4]oxazepan-3-one (diastereomer 1) as white solid (9.71 g, 25%).

Provenance & Evidence