Dimethyl Sulfoxide → 1-[(3,4-Dichlorophenyl)acetyl]-4-(phenylmethyl)-2-piperazine carboxaldehyde

Participants

Reaction Steps

A solution of dimethylsulphoxide (369 mg) in dry dichloromethane (3 ml) was added to a stirred solution of oxalyl chloride (300 mg) in dry dichloromethane (7 ml) at -60° under nitrogen and the resulting solution was stirred at -60° to -64° for 30 minutes. The product of stage (i) (774 mg) in dry dichloromethane (5 ml) was added dropwise and the reaction mixture was stirred between -60° to -63° for 2.5 h. Triethylamine (995 mg) was added and the mixture was allowed to warm to -20°, and quenched with water (15 ml). The layers were separated and the aqueous phase was further extracted with dichloromethane (2×15 ml). The combined organic extracts were dried and evaporated to give the title compound as an oil (830 mg).

Provenance & Evidence