Potassium Iodide → Ethyl 1-[2-(2,3-difluorophenoxy)ethyl]-4-[3-(3-fluoro-6-methoxyquinolin-4-yl)propyl]piperidine-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of 0.4 g of ethyl 4-[3-(3-fluoro-6-methoxyquinolin-4-yl)propyl]piperidine-4-carboxylate, 0.3 g of 1-(2-bromoethoxy)-2,3-difluorobenzene, 0.181 g of potassium iodide and 0.74 g of potassium carbonate in 15 cm3 of acetonitrile was stirred for 18 hours at a temperature in the region of 70° C. After cooling to about 20° C., the reaction mixture was concentrated to dryness under reduced pressure (5 kPa) at a temperature in the region of 40° C. The evaporation residue was purified by chromatography under atmospheric pressure, on a cartridge of silica gel (Bond Elut; particle size 70-200μ; mass 12 g), eluting with a mixture of ethyl acetate/40-60° C. petroleum ether (8/2 by volume). The fractions containing the product were combined and then concentrated to dryness under reduced pressure (2 kPa) at a temperature in the region of 40° C. 0.43 g of ethyl 1-[2-(2,3-difluorophenoxy)ethyl]-4-[3-(3-fluoro-6-methoxyquinolin-4-yl)propyl]piperidine-4-carboxylate was obtained.

Provenance & Evidence