Dimethyl Sulfoxide → HCID 23331769, compound

Participants

Reaction Conditions

Reaction Steps

Dimethylsulfoxide (625 mg, 8 mmoles) was dissolved in 20 ml of methylene chloride, and the solution was cooled to -78° C. with a dry ice-acetone bath. Oxalyl chloride (762 mg, 6 mmoles) was added to the solution, and the mixture was stirred at the same temperature for 30 minutes. Then, 1.027 g (4 mmoles) of 2-(3-benzoyl-2,5-dimethylpyrrol-1-yl)-2-methylethanol dissolved in 12 ml of methylene chloride was added dropwise to the mixture. The mixture was stirred for 30 minutes, and then 1.6 ml of triethylamine was added dropwise. The mixture was warmed up gradually to room temperature. The reaction mixture was shaken with 50 ml of methylene chloride and 50 ml of water to separate an organic layer. The organic layer was washed with water and a saturated aqueous solution of sodium chloride, and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure to form a dark scarlet oil. The oil was chromatographed on a column containing 50 g of silica gel using benzene/ethyl acetate (20/1) as an eluent. The fractions were collected each in an amount of 50 ml. From the 5th to 14th fractions, 500 mg (50%) of compound (502) was obtained.

Provenance & Evidence