Dimethylformamide → 2-{2-[7-Chloro-3-(3,5-dimethylphenyl)-6-(3-methyl-[1,2,4]oxadiazol-5-yl)-2-oxo-1,2-dihydroquinolin-4-yloxy]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a solution of 2-{2-[7-chloro-3-(3,5-dimethylphenyl)-6-iodo-2-oxo-1,2-dihydro-quinolin-4-yloxy]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester (EXAMPLE 4.2 Step B, 200 mg in a mixture of 3 mL dry N,N-dimethylformamide and 0.9 mL triethylamine) was added 118 mg of acetamide oxime followed by 11 mg of dichlorobis(triphenylphosphine) palladium (II) and the mixture heated to reflux on an oil bath under an atmosphere of carbon monoxide. After 12 hours, the mixture was cooled to room temperature and diluted with ethyl acetate and 0.5N hydrochloric acid. This was extracted with ethyl acetate and the organic portion washed with brine then dried over sodium sulfate. Purification of the concentrate by flash chromatography on silica gel (ethyl acetate:hexane, 1:4; then 3:7) gave the title compound (88 mg).

Provenance & Evidence