Diisopropylethylamine → N-(3-tert-butoxycarbonylaminopropyl)-4-cyano-4-(o-tolyl)piperidine

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Reaction Steps

A solution of 4-cyano-4-(o-tolyl)piperidine (5.00 g, 24.9 mmol) and 1-(tert-butoxycarbonylamino)-3-bromopropane (16, 6.55 g, 27.5 mmol) in DMF (100 mL) was treated with diisopropylethylamine (4.50 mL, 25.8 mmol) at room temperature. The resulting mixture was stirred at room temperature (3 d). The solvent was removed in vacuo and the residue dissolved in dichloromethane and sodium bicarbonate solution. The aqueous layer was extracted with two additional portions of dichloromethane and the combined organic extracts were washed with brine, dried over Na2SO4, and concentrated under reduced pressure. Flash chromatography on silica gel (5% methanol/dichloromethane) afforded the title compound (25).

Provenance & Evidence