Dimethyl Sulfoxide → 1-[2,4-Bis(trifluoromethyl)benzyl]-2-oxopiperidine-4-carbaldehyde

Participants

Reaction Conditions

Reaction Steps

To a solution of oxalyl chloride (4.5 mL) in dichloromethane (80 mL) was added a solution of dimethyl sulfoxide (7.3 mL) in dichloromethane (50 mL) under cooling to −78° C. The reaction mixture was stirred for 30 min under cooling to −78° C., and to the reaction mixture was added dropwise a solution of 1-[2,4-bis(trifluoromethyl)benzyl]-4-(hydroxymethyl)piperidin-2-one (10 g) in dichloromethane (50 mL). The reaction mixture was stirred for 40 min under cooling to −78° C., triethylamine (19.7 mL) was added, and the mixture was further stirred at room temperature for 30 min. To the reaction mixture was added saturated aqueous ammonium chloride solution, and the mixture was extracted with dichloromethane. The extract was washed with saturated brine, dried over sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/petroleum ether) to give the title compound (3.7 g).

Provenance & Evidence