Hydrochloric Acid → 6-(1-((2-Cyclopropyl-5-ethoxy-2',4'-difluorobiphenyl-4-yl)methyl)piperidin-4-yl)-5-oxo-2-propyl-5,6,7,8-tetrahydro-1,6-naphthyridine-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 6-(1-((2-cyclopropyl-5-ethoxy-2′,4′-difluorobiphenyl-4-yl)methyl)piperidin-4-yl)-5-oxo-2-propyl-5,6,7,8-tetrahydro-1,6-naphthyridine-3-carboxylate (13.2 g) in THF (33 mL)-ethanol (33 mL) was added 2M aqueous sodium hydroxide solution (31.2 mL). The mixture was stirred for 1 hour at 50° C. The mixture was cooled to room temperature. 2M hydrochloric acid (31.2 mL) was added to the reaction mixture. Then water (62.5 mL) was added to the reaction mixture. After cooled to 0° C., the precipitate was collected by filtration, washed with water, dried by airstream to give the title compound (12.4 g).

Provenance & Evidence