Ethanol → tert-Butyl 4-(4-aminophenyl)piperazine-1-carboxylate

Participants

Reaction Steps

A mixture of 4-(4-nitro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester (11) (18.9 mmol), 10% palladium-on-carbon (600 mg), ethanol (100 mL), and ethyl acetate (100 mL) is hydrogenated at room temperature and 40 psi for 2 hrs. The mixture is filtered through celite, washing with ethyl acetate (2×100 mL), and concentrated in vacuo to give 4-(4-amino-phenyl)-piperazine-1-carboxylic acid tert-butyl ester (12) as a brown oil.

Provenance & Evidence