Sodium Hydroxide → HCID 22469516, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 0.38 g of ethyl 1-[2-(3,4-difluorophenoxy)ethyl]-4-[3-(3-fluoro-6-methoxyquinolin-4-yl)propyl]piperidine-4-carboxylate in 3 cm3 of dioxane, 3 cm3 of methanol and 2.1 cm3 of aqueous 5N sodium hydroxide solution was stirred at a temperature in the region of 70° C. for 17 hours. After cooling to about 20° C., the reaction mixture was concentrated to dryness under a pressure gradually reduced from 30 kPa to 2.5 kPa and at a temperature in the region of 45° C. The residue was taken up in 5 cm3 of a dichloromethane/methanol/aqueous ammonia mixture (40/5/0.5 by volume) and was then purified by chromatography under atmospheric pressure, on a cartridge of silica gel (Bond Elut; particle size 70-200μ; mass 10 g), eluting with a mixture of dichloromethane/methanol/aqueous ammonia (90/9/0.9 by volume) and then with a chloroform/methanol/aqueous ammonia mixture (77.5/19.5/3). The fractions containing the product were combined, concentrated to dryness under reduced pressure (2 kPa) at a temperature in the region of 40° C. and dried in a desiccator (10 kPa). 0.3 g of 1-[2-(3,4-difluoro-phenoxy)ethyl]-4-[3-(3-fluoro-6-methoxyquinolin-4-yl)-propyl]piperidine-4-carboxylic acid was obtained in the form of a white solid.

Provenance & Evidence