4-Hydroxybenzoic Acid → HCID 28798584, compound

Participants

Reaction Conditions

Reaction Steps

(R)-1-(1-(4-Bromophenyl)ethyl)-4-tosylpiperazine (4.44 g, 10.49 mmol) and 4-hydroxybenzoic acid (4.35 g, 31.46 mmol) in hydrobromic acid (33% in AcOH, 40 mL,) were stirred at room temperature for 48 hours. Water (40 mL) was then added to the dark mixture and stirring continued for a further 2 hours to give a beige solid, which was filtered off and washed with water (10 mL). The combined filtrate and washings were washed with toluene (3×50 mL) then cooled to 5° C. and basified to pH>10 with 40% NaOH. The resulting mixture was extracted with tert butyl methyl ether (2×50 mL) and the combined extracts washed with saturated brine, dried over MgSO4 and evaporated to give (R)-1-[1-(4-bromophenyl)ethyl]piperazine (2.69 g, 95%) as an orange, viscous oil.

Provenance & Evidence