反应详情

Pd2(dba)3 (157 mg, 0.17 mmol), 2-dicyclohexylphosphino-2′-(N,N-dimethylamino)-biphenyl (134.7 mg, 0.34 mmol), N-(5-bromo-2-trifluoromethoxy-phenyl)-acetamide (5.05 g, 17 mmol)) were charged in a round-bottom flask flushed with argon. The flask was evacuated and backfilled with argon. Lithium bis(trimethylsilyl)amide solution (1M in THF, 37.6 mL) and N-methylpiperazine (2.3 mL, 20.5 mmol) were added and the reaction mixture refluxed for 3 h. The reaction mixture was then allowed to cool to room temperature and concentrated. The crude solid was purified by flash chromatography on silica gel (eluant: DCM/EtOH 90/10) to afford 4.78 g (88% yield) of the N-[2-trifluoromethoxy-5-(4-methyl-piperazin-1-yl)-phenyl]-acetamide.

1. customflushed with argon
2. customThe flask was evacuated
3. temperaturethe reaction mixture refluxed for 3 h
4. concentrationconcentrated
5. customThe crude solid was purified by flash chromatography on silica gel (eluant: DCM/EtOH 90/10)