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2.0 g (9.9 mmol) of 4′-fluoro-4-methylbiphenyl-3-amine and 1.64 g (11.9 mmol) of potassium carbonate were suspended in THF, and 1.49 g (10.9 mmol) of chloroglyoxylic acid ethyl were added thereto at 0° C., and stirred at room temperature for 4 hours. After completion of the reaction, ethyl acetate was added to the mixture, and the mixture was washed with an aqueous sodium bicarbonate solution and a sodium chloride solution in this order. The resulting organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure to give 2.76 g of [(4′-fluoro-4-methylbiphenyl-3-yl)amino] (oxo)acetic acid.ethyl ester (yield: 93%).

1. additionwas added to the mixture
2. washthe mixture was washed with an aqueous sodium bicarbonate solution
3. dry with materialThe resulting organic layer was dried over anhydrous sodium sulfate
4. distillationthe solvent was distilled off under reduced pressure