Sodium borohydride → 2-(3,4,5-Trifluorophenyl)piperidine

Participants

Reaction Steps

To 5-amino-1-(3,4,5-trifluorophenyl)pentan-1-one (0.11 g, 0.48 mmol) in tetrahydrofuran/methanol 4:1 (10 mL) was added in portions over 20 minutes solid sodium borohydride (0.20 g, 5.0 mmol) and stirring was continued 18 hours at 25° C. The reaction mixture was concentrated then taken into ethyl acetate (40 mL), washed with saturated sodium chloride/2 N aqueous sodium hydroxide 10:1 (11 mL) then dried over anhydrous sodium sulfate, filtered and concentrated. The residue was purified by silica gel column chromatography (ethyl acetate/hexanes, 1:1) to give 2-(3,4,5-trifluorophenyl)piperidine (0.70 g, 68% yield) as an oil. 1H NMR (400 MHz, CDCl3): 7.01 (m, 2H), 3.52 (m, 1H), 3.17 (m, 1H) 2.77 (m, 1H), 2.07 (br s, 1H), 1.88 (m, 1H), 1.74 (m, 1H), 1.64 (m, 1H), 1.55-1.35 (m, 3H).

Provenance & Evidence