2-Nitro-5-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine → 5-(2,2,2-Trifluoroethyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-amine

Participants

Reaction Steps

To a solution of 134a (390 mg, 1.56 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 under reduced pressure to afford 134b as a yellow solid (308 mg, 90%), which was used in the next step without further purification. MS-ESI: [M+H]+ 221.1

Provenance & Evidence