反应详情

TFA (13 mL) was added drop wise to {2-Oxo-2-[4-(2-trifluoromethyl-benzoyl)-piperazin-1-yl]-ethyl}-carbamic acid tert-butyl ester (2.6 g, 6.27 mmol) in DCM (15 mL) at 0° C. The resulting mixture was stirred at room temperature for 2 hours. Concentrating the mixture afforded a crude product, which was recrystallized from hexane to afford 2.5 g (93% yield) of 2-amino-1-[4-(2-trifluoromethyl-benzoyl)-piperazin-1-yl]-ethanone as TFA salt.

1. concentrationConcentrating the mixture
2. customafforded a crude product, which
3. customwas recrystallized from hexane