Hydrochloric Acid → 8-(1-(3,5-difluorophenylamino)ethyl)-2-((S)-3-methylmorpholino)-4-oxo-4H-chromene-6-carboxylic acid

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Reaction Steps

2N NaOH (0.206 mL, 0.41 mmol) was added to a stirred suspension of methyl 8-(1-(3,5-difluorophenylamino)ethyl)-2-((S)-3-methylmorpholino)-4-oxo-4H-chromene-6-carboxylate (90 mg, 0.20 mmol) in MeOH (1 mL)/THF (1 mL) and cooled with an ice-water bath. The resulting suspension was stirred at RT for 2 hours. The reaction was incomplete thus the temperature was increased to 35° C. and stirred for an additional hour. The reaction mixture was cooled with an ice bath, the pH was adjusted to 2-3 with hydrochloric acid 1M and the volatiles were evaporated. The resulting precipitate was collected by filtration, dried, triturated with diethyl ether, collected by filtration and dried again under vacuum to give 8-(1-(3,5-difluorophenylamino)ethyl)-2-((S)-3-methylmorpholino)-4-oxo-4H-chromene-6-carboxylic acid (75 mg, 86%). Mass Spectrum: M+H+ 445.

Provenance & Evidence