Lithium Hydroxide → HCID 136352699, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of ethyl 1-(2,6-difluorophenyl)-6-hydroxy-1H-pyrazolo[3,4-b]pyrazine-5-carboxylate (1.27 g, 3.70 mmol) in 2.5 mL of water and 2.5 mL of CH3CN at RT was added lithium hydroxide (209 mg, 8.72 mmol), and the resulting mixture was warmed to 60° C. for 0.5 h. The reaction mixture was cooled with an ice bath, and NBS (1059 mg, 5.95 mmol) was added in small portions. The reaction mixture was stirred at RT for 0.5 h, then partitioned between a saturated solution of NaHCO3 and EtOAc. The EtOAc layer was washed with brine, dried over MgSO4, filtered and concentrated to afford 5-bromo-1-(2,6-difluorophenyl)-1H-pyrazolo[4,3-b]pyrazin-6(7H)-one (1210 mg, 93.3% yield) a a brown amorphous solid. This crude material was used without further purification. MS (ES+): 327.0/329.0 (M+H)+.

Provenance & Evidence