Diisopropylethylamine → 2-[4-Phenyl-1-(3-phenyl-propyl)-butylcarbamoyl]piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

1-tert-Butoxycarbonyl-piperidine-2-carboxylic acid (3 g; 13.1 mmol) is dissolved in methylene chloride (100 mL) at ambient temperature. 1,7-Diphenyl-4-aminoheptane hydrochloride (1) (4.77 g; 15.7 mmol), diisopropylethylamine (7.3 mL; 41.9 mmol), and PyBOP (8.17 g; 15.7 mmol) are added sequentially. The mixture is stirred for 17 hours at ambient temperature then concentrated in vacuo at 40° C. The residue is purified via silica gel chromatography with gradient elution (10%→30% ethyl acetate in hexanes) affording the desired product as an oil. ESMS:MH+ 479.4

Provenance & Evidence