[F:1][C:2]([F:19])([F:18])[C:3]1[CH:17]=[CH:16][C:6]([O:7][C:8]2[CH:15]=[CH:14][C:11]([CH:12]=O)=[CH:10][CH:9]=2)=[CH:5][CH:4]=1.[F:20][C:21]1[CH:26]=[CH:25][C:24]([CH2:27][NH2:28])=[CH:23][CH:22]=1.C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClC(Cl)C>[F:20][C:21]1[CH:26]=[CH:25][C:24]([CH2:27][NH:28][CH2:12][C:11]2[CH:14]=[CH:15][C:8]([O:7][C:6]3[CH:16]=[CH:17][C:3]([C:2]([F:19])([F:18])[F:1])=[CH:4][CH:5]=3)=[CH:9][CH:10]=2)=[CH:23][CH:22]=1To a mixture of 4-(4-(trifluoromethyl)phenoxy)benzaldehyde (1.4 g, 5.2 mmol) in anhydrous dichloroethane (10 mL), at room temperature under nitrogen, was added (4-fluorophenyl)methanamine (0.6 mL, 52 mmol). The mixture was stirred for 3 minutes before acetic acid (0.42 mL, 7.3 mmol) was added dropwise via syringe. After an additional 30 minutes, sodium triacetoxyborohydride (1.6 g, 7.3 mmol) was added to the reaction mixture. After 20 h, the reaction was quenched with 1 N aqueous NaOH (30 mL) then extracted with chloroform. The organic extracts were combined, washed with saturated aqueous NaHCO3 and brine, dried over anhydrous MgSO4, filtered and concentrated in vacuo. The residue was purified by silica gel flash chromatography (ISCO system, eluting with 0-5% MeOH in CHCl3) to afford the desired compound (0.51 g, 24%) as a colorless oil. MS (ESI): 376.1 (M+H)+.
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