Propionyl chloride → N-(1-Boc-piperidin-3-ylmethyl)-N-phenyl-propionamide

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To a solution of N-(1-Boc-piperidin-3-ylmethyl)-aniline 4 (4.60 g, 15.8 mmol) and N,N-diisopropylethylamine (1.40 mL, 15.8 mmol) in 25 mL of dry methylene chloride was added propionyl chloride (1.40 mL, 15.8 mmol) dropwise at 0° C. After being stirred at room temperature overnight, the reaction mixture was quenched with 30 mL of H2O and extracted with ethyl acetate (3×100 mL). The extracts were combined and washed with aqueous HCl (5%, 20 mL), NaHCO3 (sat., 2×30 mL), brine (50 mL), and dried over anhydrous sodium sulfate. After the solvent was removed, the remaining oily residue was purified by a flash column chromatography (silica gel, hexane:ethyl acetate) to afford N-(1-Boc-piperidin-3-ylmethyl)-N-phenyl-propionamide 5 as a colorless oil (4.50 g, 82%). IR (film, cm−1) 2975, 2934, 2854, 1690, 1663, 1591, 1496, 1422, 1402, 1365, 1265, 1242, 1176, 1149, 1038, 962,775, 702; 1H NMR (CDCl3, ppm) 7.44-7.22 (m, 5H), 4.09-3.22 (m, 4H), 2.80-2.09 (m, 2H), 2.06 (q, 2H, J=7.5 Hz), 1.75-1.19 (m, 5H), 1.48(s, overlap, 9H), 1.06 (t, 3H, J=7.5 Hz).

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