Triethylamine → 3-[4-Phenyl-1-(3-phenyl-propyl)-butylcarbamoyl]-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

1-tert-Butoxycarbonyl-piperidine-3-carboxylic acid (1 g; 4.36 mmol) is dissolved in methylene chloride (50 mL) at ambient temperature. 1,7-Diphenyl-4-aminoheptane hydrochloride (1) [1.33 g; 4.36 mmol], triethylamine (0.61 mL; 4.36 mmol), and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (0.84 g; 4.4 mmol) are added sequentially. The mixture is stirred for 18 hours at ambient temperature then concentrated in vacuo at 30° C. The residue is diluted with ethyl acetate (100 mL) and washed successively with water (200 mL), saturated aqueous sodium bicarbonate (50 mL), and saturated brine (50 mL). The organic layer is dried over MgSO4, filtered, and concentrated in vacuo. The residue is purified via silica gel chromatography with gradient elution (5%→40% ethyl acetate in hexanes) affording the desired product (1.30 g) as a viscous oil. ESMS: MH+ 479.4

Provenance & Evidence