Ethyl Acetate → 5-{[1-(2-Chloro-3-fluoro-4-hydroxyphenyl)-3,3,3-trifluoro-2-hydroxy-2-(hydroxymethyl)-propyl]amino}-7-fluoro-1H-quinolin-2-one

Participants

Reaction Steps

To 100 mg (0.20 mmol) of 5-{[1-(2-Chloro-3-fluoro-4-methoxyphenyl)-3,3,3-trifluoro-2-hydroxy-2-(methoxymethyl)propyl]amino}-7-fluoro-1H-quinolin-2-one of example 5 in 8.6 dichloromethane at −30° C. are added 1.6 ml of a 1 M solution of boron tribromide in dichloromethane under argon. The reaction mixture is stirred for 16 hours in a temperature range of between 0° C. and 25° C. The reaction mixture is mixed at 0° C. with saturated sodium bicarbonate solution. After dilution with ethyl acetate the batch is allowed to come to room temperature, stirred for 10 minutes and phases are separated. The aqueous phase is acidified with 4 M HCl and extracted with 10% methanol in dichloromethane. After removal of the solvent preparative thin layer chromatography on silica gel (ethyl acetate/methanol 4:1) yields 16 mg of the title compound.

Provenance & Evidence