[F:1][C:2]1[C:10]([F:11])=[CH:9][C:5]([C:6](O)=[O:7])=[C:4]([N+:12]([O-:14])=[O:13])[CH:3]=1.C1COCC1>CO>[F:1][C:2]1[C:10]([F:11])=[CH:9][C:5]([CH2:6][OH:7])=[C:4]([N+:12]([O-:14])=[O:13])[CH:3]=14,5-Difluoro-2-nitro-benzoic acid (3.05 g, 15 mmol) was combined with THF (20 mL), and then BH3 THF (35 mL) was added over 15 min. The resulting mixture was stirred overnight at 60° C. and then cooled to room temperature. Methanol was added, and the resulting mixture was stirred 15 min. The solvent was removed to yield an oil, which was purified by silica gel chromatography to yield a residue.
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