Hydrochloric Acid → 8-(1-(3,5-difluorophenyl)pyrrolidin-2-yl)-2-morpholino-4-oxo-4H-chromene-6-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

An aqueous NaOH 2N (0.622 mL, 1.24 mmol) solution was added to methyl 8-(1-(3,5-difluorophenyl)pyrrolidin-2-yl)-2-morpholino-4-oxo-4H-chromene-6-carboxylate (195 mg, 0.41 mmol) in MeOH (2 mL) and the reaction mixture stirred at 40° C. for 6 h. The mixture was cooled to 0° C. and an aqueous HCl 2N (0.684 mL, 1.37 mmol) solution was added dropwise to the reaction mixture until pH ˜5. The solution was partially concentrated and a precipitate appeared. Water was added to the slurry and extracted with DCM. The organic phase was washed with water, dried over MgSO4, filtered and concentrated. The formed precipitate was triturated with ether, filtered, washed with ether, dried under vacuum at 50° C. to afford 8-(1-(3,5-difluorophenyl)pyrrolidin-2-yl)-2-morpholino-4-oxo-4H-chromene-6-carboxylic acid (67 mg, 35%) as a pale beige solid. Mass Spectrum: m/z [M+H]+=457.

Provenance & Evidence