1-Phenylpiperazine → HCID 66650746, compound

Participants

Reaction Steps

2-(4-(tert-Butoxycarbonyl)piperazin-1-yl)ethyl 4-nitrophenyl carbonate (7.01 g, 17.7 mmol) was dissolved in DMF (150 mL). Phenylpiperazine (2.8 mL, 18.3 mmol) and NEt3 (3.0 mL, 21.5 mmol) were added and the reaction mixture was stirred at room temperature for 18 hours. The reaction mixture was concentrated in vacuo, dissolved in EtOAc (250 mL), washed with 1M aq Na2CO3 solution (5×250 mL), dried (MgSO4) and concentrated in vacuo. The residue was purified by reverse phase chromatography (gradient eluting with MeOH in water, 0-100%) to give 2-(4-(tert-butoxycarbonyl)piperazin-1-yl)ethyl 4-phenyl-piperazine-1-carboxylate (5.68 g, 77%) as a yellow oil. 2-(4-(tert-Butoxycarbonyl)-piperazin-1-yl)ethyl 4-phenylpiperazine-1-carboxylate (0.45 g, 1.07 mmol) was dissolved in a mixture of DCM (30 mL) and 2M HCl in Et2O (4 mL, 8 mmol) and stirred overnight. The supernatant was discarded. The residue washed with DCM (3×15 mL) and dried in vacuo to give 2-(piperazin-1-yl)ethyl 4-phenylpiperazine-1-carboxylate trihydrochloride (0.42 g, 98%) as a pale brown glass.

Provenance & Evidence