[F:1][C:2]([F:22])([F:21])[C:3]1[CH:4]=[C:5]([NH:13][C:14](=[O:20])[O:15][C:16]([CH3:19])([CH3:18])[CH3:17])[CH:6]=[C:7]([C:9]([F:12])([F:11])[F:10])[CH:8]=1.[H-].[Na+].[CH3:25]I.O>CN(C=O)C>[F:1][C:2]([F:21])([F:22])[C:3]1[CH:4]=[C:5]([N:13]([CH3:25])[C:14](=[O:20])[O:15][C:16]([CH3:19])([CH3:17])[CH3:18])[CH:6]=[C:7]([C:9]([F:12])([F:11])[F:10])[CH:8]=1To a solution of the compound (12.1 g) obtained in step 1 in DMF (55 mL) was added sodium hydride (1.82 g) at 0° C. The reaction mixture was stirred at 0° C. for 5 min, methyl iodide (11.4 mL) was added dropwise, and the mixture was stirred at room temperature for 3 hr. The reaction mixture was poured into water, and extracted twice with ethyl acetate. The extract was washed with saturated brine, dried and concentrated under reduced pressure. The residue was separated and purified by silica gel column chromatography (10% ethyl acetate/hexane) to give tert-butyl [3,5-bis(trifluoromethyl)phenyl](methyl)carbamate (12.5 g, 99%) as a colorless oil.
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