p-Bromochlorobenzene → 4-(4-Chlorophenyl)-1-(3-methoxybenzyl)piperidin-4-ol

Participants

Reaction Conditions

Reaction Steps

To 1-bromo-4-chlorobenzene (397 mg, 2.07 mmol) in tetrahydrofuran (10 mL), at −78° C., was added n-butyllithium (0.91 mL of a 2.5 M solution in hexanes, 2.3 mmol) dropwise. After 0.5 h, a solution of the ketone (500 mg, 2.28 mmol) from Step B above in tetrahydrofuran (5 mL) was added dropwise. The reaction mixture was stirred at −78° C. for 1.5 h and then warmed to 0° C. After 1 h, the reaction mixture was quenched with saturated ammonium chloride (5 mL) and warmed to ambient temperature. The mixture was diluted with ethyl acetate (50 mL) and washed with saturated ammonium chloride (20 mL), water (20 mL), brine (20 mL), dried over sodium sulfate and concentrated in vacuo. Purification by silica gel chromatography (5% ethyl acetate/methylene chloride to ethyl acetate) gave 4-(4-chlorophenyl)-1-(3-methoxybenzyl)piperidin-4-ol (370 mg, 53%) as a colorless oil: 1H NMR (DMSO-d6, 500 MHz) δ 7.50 (d, J=8.5 Hz, 2H), 7.35 (d, J=8.5 Hz, 2H), 7.24-7.21 (m, 1H), 6.90-6.89 (m, 2H), 6.81-6.79 (m, 1H), 4.87 (s, 1H), 3.74 (s, 3H), 3.47 (s, 2H), 2.61-2.59 (m, 2H), 2.43-2.38 (m, 2H), 1.94-1.87 (m, 2H), 1.57-1.54 (m, 2H).

Provenance & Evidence