Trifluoroacetic acid → 3-(Piperazin-1-yl)-3-oxopropionic acid [4-phenyl-1-(3-phenyl-propyl)-butyl]-amide

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Reaction Steps

3-[4-(tert-Butoxycarbonyl)piperazin-1-yl]-3-oxopropionic acid [4-phenyl-1-(3-phenyl-propyl)-butyl]-amide (37) (2.05 g; 3.93 mmol) is dissolved in methylene chloride (30 mL) at ambient temperature. Trifluoroacetic acid (15 mL) is added in a slow stream, and the solution is stirred for 1 hour at ambient temperature. The solution is concentrated in vacuo at 40° C. The residue is dissolved in methylene chloride (200 mL) and poured onto saturated sodium bicarbonate solution. The pH is adjusted to 9 with saturated potassium carbonate solution. The mixture is shaken and the layers separated. The water layer is extracted with methylene chloride (3×50 mL). The combined organic extracts are washed with water, dried over MgSO4, filtered, and concentrated in vacuo affording the desired product as an oil. ESMS: MH+ 422.2

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