Pyridine → Tert-butyl 4-{2-[(4-{3-chloro-4-[(phenoxycarbonyl)amino]phenoxy}-2-pyridyl)amino]-2-oxoethyl}-1-piperidinecarboxylate

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Reaction Steps

Phenyl chloroformate (210 mg) was added dropwise to a solution of 570 mg of tert-butyl 4-(2-{[4-(4-amino-3-chlorophenoxy)-2-pyridyl]amino}-2-oxoethyl)-1-piperidinecarboxylate, 110 mg of pyridine and 5 ml of dimethylformamide while stirring at room temperature, and the mixture was further stirred for 30 minutes. Water was added and extraction was performed with ethyl acetate. The organic layer was washed twice with water and once with brine, and then silica gel was added and the solvent was distilled off under reduced pressure. This was then charged into a dry column packed with silica gel and purification was performed by column chromatography (hexane:ethyl acetate=1:1, followed by ethyl acetate), to obtain 440 mg of tert-butyl 4-{2-[(4-{3-chloro-4-[(phenoxycarbonyl)amino]phenoxy}-2-pyridyl)amino]-2-oxoethyl}-1-piperidinecarboxylate as a light yellow oil. After adding 71 mg of aniline and 5 ml of dimethylformamide to the oil, it was stirred at 130° C. for 15 minutes. The reaction solution was returned to room temperature, NH type silica gel was added, the solvent was distilled off under reduced pressure and the reaction product was adsorbed onto the silica gel. The silica gel was charged into a dry column packed with NH type silica gel, and column purification was performed (hexane:ethyl acetate=1:1). The solvent was distilled off under reduced pressure to obtain 180 mg of the target substance.

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