tert-Butyl 5-(4-nitrophenyl)-3-oxo-2,3-dihydro-1H-pyrazole-1-carboxylate → tert-Butyl 5-(4-aminophenyl)-3-oxo-2,3-dihydro-1H-pyrazole-1-carboxylate

Participants

Reaction Steps

A solution of 2.2 g (7.1 mmol) of tert-butyl 5-(4-nitrophenyl)-3-oxo-2,3-dihydro-1H-pyrazole-1-carboxylate in 100 ml of ethanol was hydrogenated in the presence of 253 mg of palladium (10% on activated carbon) at RT and standard pressure. The reaction mixture was then filtered through Celite and the filtrate was concentrated under reduced pressure and dried. Yield: 1.99 g (purity 90%, 92% of theory)

Provenance & Evidence