1-(Benzenesulfonyl)-4-nitropyrazole → 1-(phenylsulfonyl)-1H-pyrazol-4-amine

Participants

Reaction Steps

To a solution of 4-nitro-1-(phenylsulfonyl)-1H-pyrazole (21.0 g, 82.9 mmol) in methanol (300 mL) was added Pd/C (10% wt, 4.0 g), and the mixture was stirred for 12 h at room temperature under a H2 atmosphere. After filtration, the filtrate was concentrated under reduced pressure. The resulting residue was washed with petroleum ether and dried to afford the product as a white solid (15.0 g, 81.1% yield).

Provenance & Evidence