5-Methyl-2-nitro-4,5-dihydropyrazolo[1,5-a]pyrazin-6(7H)-one → 2-Amino-5-methyl-4,5-dihydropyrazolo[1,5-a]pyrazin-6(7H)-one

Participants

Reaction Steps

A solution of 146c (450 mg, 2.3 mmol) in ethanol (30 mL) was added Pd/C (10%, 400 mg). The reaction was charged with hydrogen gas (via balloon) and stirred at room temperature for 2 h. After reaction was complete, the mixture was filtered through a plug of CELITE® and the filtrate was concentrated under reduced pressure to afford 146d as a yellow solid (320 mg, 84%), which was used without further purification in the next step. MS-ESI: [M+H]+ 167.1

Provenance & Evidence