Piperazine → HCID 56677001, compound

Participants

Reaction Conditions

Reaction Steps

Into a 100-mL 3-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed a solution of 6-bromo-3-methyl-1-phenyl-1H-indazole (1 g, 3.50 mmol, 1.00 equiv) in toluene (20 mL), piperazine (600 mg, 6.98 mmol, 2.00 equiv), Cs2CO3 (1.7 g, 5.21 mmol, 1.50 equiv), Pd(AcO)2 (20 mg, 0.09 mmol, 0.03 equiv), BINAP (20 mg, 0.03 mmol, 0.03 equiv). The resulting solution was stirred overnight at 100° C. in an oil bath. The resulting mixture was cooled, the solids were filtered out. The residue was applied onto a silica gel column with dichloromethane/methanol (20:1). The resulting residue (300 mg) was purified by Prep-HPLC with the following conditions (AGILENT Pre-HPLC (UV-Directed)): Column, SunFire Prep C18, 5 um, 19*100 mm; mobile phase, water with 0.05% TFA and MeOH (10% MeOH up to 42% in 4 min, hold 42% in 3.5 min, up to 100% in 0.1 min, hold 100% in 1.4 min); Detector, UV 220NMnm to yield 3-methyl-1-phenyl-6-(piperazin-1-yl)-1H-indazole as a light yellow solid.

Provenance & Evidence