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

Participants

Reaction Steps

To a solution of 151d (220 mg, 1.0 mmol) in ethanol (20 mL) was added Pd/C (10%, 22 mg). The reaction mixture was charged with hydrogen gas (via balloon) and stirred at room temperature for 1 h. The reaction mixture was filtered through a plug of CELITE® and the filtrate was concentrated under reduced pressure to afford 151e as a yellow solid (180 mg, 92%), which was used without further purification. MS-ESI: [M+H]+ 195.3

Provenance & Evidence