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0 °C

A solution of methyl chloroglyoxylate (184 μl, 2.0 mmol) in dichloromethane (1.5 ml) was added dropwise at a slow speed to a mixture of 3-amino-4-[4-(tert-butyl)benzyloxy]-4′-(trifluoromethoxy)biphenyl (415 mg, 1.0 mmol), sodium hydrogencarbonate (168 mg, 2.0 mmol), water (5 ml) and dichloromethane (7 ml), and the mixture was stirred at 0° C. for 2 hours. The reaction mixture was diluted with water, and extracted with ethyl acetate. The organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to give the title compound (456 mg, 90.9%) as a white solid.

1. extractionextracted with ethyl acetate
2. washThe organic layer was washed with saturated brine
3. dry with materialdried over anhydrous sodium sulfate
4. customThe solvent was evaporated under reduced pressure