Dimethyl Sulfoxide → 7-Fluoro-2-methyl-5-piperazin-1-ylquinoline

Participants

Reaction Conditions

Reaction Steps

A stirred mixture of piperazine (20 g), potassium carbonate (32 g), 5,7-difluoro-2-methylquinoline hydrochloride (WO2002034754, 20 g) and dimethylsulfoxide (390 mL) was heated to 120° C. for 15 hours. The mixture was cooled to room temperature, diluted with water (600 mL) and extracted with 6×500 mL portions of a mixture of DCM-ether (15:85). The combined organic extracts were washed with water (200 mL) and brine (200 mL), dried (sodium sulfate) and the solvent was partially evaporated under vacuum. The precipitate formed during the evaporation was filtered-off, washed with ether (50 mL) and dried under vacuum to give the title compound (4.7 g, 21%).

Provenance & Evidence