Trifluoroacetic acid → Piperidine-4-carboxylic acid [4-phenyl-1-(3-phenyl-propyl)-butyl]-amide

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Reaction Steps

1-(tert-Butoxycarbonyl)-piperidine-4-carboxylic acid [4-phenyl-1-(3-phenyl-propyl)-butyl]-amide (20) (8.17 g; 17.1 mmol) is dissolved in methylene chloride (60 mL) at ambient temperature. Trifluoroacetic acid (40 mL) is added in a slow stream, and the solution is stirred for 2 hours at ambient temperature. The solution is concentrated in vacuo at 40° C. The residue is dissolved in methylene chloride (400 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 (3×100 mL). The combined organic extracts are washed with water, dried over MgSO4, filtered, and concentrated in vacuo affording the desired product (5.91 g) as a white solid. ESMS: MH− 379.0

Provenance & Evidence