Acetic Anhydride → 1-(4-(4-Bromophenyl)piperidin-1-yl)ethanone

Participants

Reaction Steps

To a solution of 4-(4-bromophenyl)piperidine (400 mg, 1.70 mmol) in dichloromethane (20 mL) was added triethylamine (340 mg, 3.40 mmol) and acetic anhydride (500 mg, 5.10 mmol). The mixture was stirred at room temperature for 2 hours. The reaction mixture was concentrated under reduced pressure to give a crude residue. The material was partitioned between water (20 mL) and ethyl acetate (20 mL). The layers were separated and the aqueous layer was washed two additional times with ethyl acetate (30 mL). The combined organics layers were dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give the title compound (260 mg, 60% yield) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 7.27 (d, 2 H), 6.91 (d, 2 H), 4.63 (d, 1 H), 3.77 (d, 1 H), 3.00 (t, 1 H), 2.57-2.42 (t, 2 H), 1.97 (s, 3 H), 1.75-1.68 (m, 2 H), 1.47-1.40 (m, 2 H).

Provenance & Evidence