Acetic Acid → 1-(3-Bromo-5-fluorophenyl)-4-cyclopropylpiperazine

Participants

Reaction Steps

To mixture of 1-(3-bromo-5-fluorophenyl)piperazine (2.91 g, 11 mmol) in MeOH (50 mL) was added (1-ethoxycyclopropoxy)trimethylsilane (13.5 mL, 67.2 mmol), acetic acid (6.5 mL, 112 mmol) and NaBCNH4 (1.0 M in THF) (51 mL, 50.4 mmol). The resulting mixture was heated to 70 C overnight and concentrated in vacuuo to give crude residue which was diluted with EtOAc and washed with 1 N NaOH followed by brine. The organic layer was separated, dried with anhydrous MgSO4, filtered and concentrated in vacuo to give desired 1-(3-bromo-5-fluorophenyl)-4-cyclopropylpiperazine in quantitative yield.

Provenance & Evidence