Water → 2-Phenylpiperazine

Participants

Reaction Steps

2-Oxo-3-phenyl-piperazine (1.76 g, 10 mmol), in 30 mL of anhydrous THF was added dropwise to a 20 mL (20 mmol) of 1M solution of LiAH4 in THF, and the mixture was stirred at room temperature for 24 h. After workup (water, 20% NaOH addition to destroy excess LiAH4), the mixture was filtered and the filter cake was reextracted with ethyl acetate. The combined organic filtrate and exam were dried over MgSO4, filtered and evaporated to give an slightly yellow solid that was purified by silica gel column chromatography (CHCl3:MeOH:NH4OH/9:1:0.1). The reduced product was isolated as a colorless solid (960 mg, 6 mmol, 60%). 1H NMR (CDCl3): δ 2.69 (1H, t, J=11.3), 2.85-3.10 (7H, m), 3.76 (1H, br d, J=8.9), 7.21-7.38 (5H, m). mp (free base): 79°-81° C.

Provenance & Evidence