Tert-butyl 4-(3-nitrophenethyl)piperazine-1-carboxylate → Tert-butyl 4-(3-aminophenethyl)piperazine-1-carboxylate

Participants

Reaction Steps

A Parr glass liner was charged with tert-butyl 4-(3-nitrophenethyl)piper-azine-1-carboxylate (7C, 1.0 eq) and methanol (about 0.2 M 7C in MeOH). To this solution was added a slurry of 12.5 wt eq of 10% Pd/C in methanol. The reaction mixture was sealed in a Parr hydrogenation vessel and subjected to 3 pressurization/venting cycles with H2. The reaction mixture was allowed to proceed at room temperature and 45 psi H2 for 2.5 h. The reaction mixture was then charged with 12.5 wt eq of Pd(OH)2/C and the vessel was repressurized with hydrogen (45 psi). After 1 hr, the reaction mixture was filtered through a pad of diatomaceous earth, the diatomaceous earth washed with MeOH, and the combine organic layers concentrated in vacuo to provide the desired tert-butyl 4-(3-aminophenethyl)piperazine-1-carboxylate (7D, 63%), which was used without further purification.

Provenance & Evidence