Water → Tert-butyl 4-[3-(propionylamino)phenyl]-1-piperidinecarboxylate

Participants

Reaction Steps

Propionyl chloride (5.53 g, 0.0597 mol) was added dropwise to a solution of tert-butyl 4-(3-aminophenyl)-1-piperidinecarboxylate (15.0 g, 0.0543 mol) and TEA (16.5 g, 0.163 mol) in THF (200 mL) and the mixture was stirred at room temperature for 3 h. Water (50 mL) was added to the reaction mixture, the aqueous layer was extracted with CH2Cl2 (3×100 mL), and the combined organic extracts were washed with brine (50 mL), dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by chromatography on silica using hexane/EtOAc (10:1) to afford the product (18.8 g, 99%). 1H NMR (400 MHz, CDCl3) δ 7.48 (s, 1H) 7.34–7.21 (m, 3H), 6.93 (d, 1H, J=7.4 Hz), 2.77 (t, 2H, J=11.5 Hz), 2.68–2.58 (m, 1H), 2.38 (q, 2H, J=7.6 Hz), 1.87–1.67 (m, 4H), 1.67–1.54 (m, 2H), 1.48 (s, 9H), 1.25 (t, 3H, J=7.5 Hz); ESMS m/e: 333.4 (M+H)+.

Provenance & Evidence