Bromine → 1-(4-Bromo-3-methoxy-phenyl)-piperazine hydrochloride

Participants

Reaction Steps

To a solution of 2.33 g (8.8 mmol) of 1-(3-Methoxyphenyl)piperazine dihydrochloride and 756 mg (9.7 mmol) sodium acetate in 70 mL of acetic acid and 15 mL of water at 0° C. was added 1.55 g (9.7 mmol) bromine. After 1 hour, the reaction was concentrated to an oil in vacuo, and the oil was partitioned between ethyl acetate and 1M NaOH. The phases were separated, and the ethyl acetate phase was washed once each with water and brine, dried over Na2SO4, filtered, and the filtrate was concentrated to an oil in vacuo. The oil was dissolved in a minimum volume of methanol, and the solution was acidified with 2M HCl in ether. The product was isolated by filtration. 1H NMR (D2O, 400 MHz) 7.36 (d, 1H), 6.73 (s, 1H), 6.50 (d, 1H), 3.75 (s, 3H), 3.32 (m, 8H) ppm.

Provenance & Evidence