5-(2,2-Difluoroethyl)-2-nitro-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine → 5-(2,2-Difluoroethyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-amine

Participants

Reaction Steps

A solution of 135a (370 mg, 1.59 mmol) in ethanol (20 mL) was added Pd/C (about 200 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®. The filtrate was concentrated reduced pressure to afford 135b as a yellow solid (293 mg, 91%), which was used in the next step without further purification. MS-ESI: [M+H]+ 203.2

Provenance & Evidence