Trifluoroacetic acid → N-(piperidine-4-carbonyl)-3-(3-pridyl)-alanine [4-phenyl-1-(3-phenyl-propyl)-butyl]-amide

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Reaction Steps

N-(N-tert-Butoxycarbonyl-piperidine-4-carbonyl)- 3-(3-pyridyl)-alanine [4-phenyl-1-(3-phenyl-propyl)-butyl]-amide (86) (1.30 g; 2.07 mmol) is dissolved in methylene chloride (40 mL) at ambient temperature. Trifluoroacetic acid (20 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 (200 mL) and poured onto saturated sodium bicarbonate solution. The pH is adjusted to 9 with saturated potassium carbonate solution. The mixture is shaken 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 (0.98 g) as a white solid. ESMS:MH+ 527.2

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