Hydrochloric Acid → (2-Bromo-phenyl)-piperazin-1-yl-methanone hydrochloride

Participants

Reaction Steps

HCl (50 mL) was added to 4-(2-bromo-benzoyl)-piperazine-1-carboxylic acid tert-butyl ester (9 g, 24.4 mmol) at 0° C. The resulting mixture was stirred for 4 hours, then concentrated. The resulting residue was washed with 1% MeOH in ethyl acetate and dried under reduced pressure to afford 7.1 g (95%) of (2-bromo-phenyl)-piperazin-1-yl-methanone hydrochloride salt, LCMS: 306.6 (M+1)+, 86.8%, 1H NMR: (DMSO-d6): δ 9.6 (s, 2H), 7.7 (d, 1H), 7.45 (m, 3H), 4.0 (m, 1H), 3.76 (m, 1H), 3.18 (bs, 2H), 3.06 (bs, 2H).

Provenance & Evidence