To a stirred solution of [(biphenyl-4-carbonyl)-amino]-acetic acid (0.03219 g, 0.00012 mol) in DMF (1 mL), was added, DIPEA (0.065 g, 0.0005 mol), HOBt (0.017 g, 0.00012 mol) and EDCI.HCl (0.2689 g, 0.00013 mol) at ambient temperature. After 2 minutes piperidin-4-yl-(2-trifluoromethyl-phenyl)-amine dihydrochloride (0.04 g, 0.00012 mol) was and the resulting mixture was stirred at the same temperature overnight. The reaction mixture was diluted with cold water, and the resulting precipitate was isolated by filtration. The solid was recrystallized from a mixture of ethyl acetate and hexane to afford 0.042 g (61%) of biphenyl-4-carboxylic acid {2-oxo-2-[4-(2-trifluoromethyl-phenylamino)-piperidin-1-yl]-ethyl}-amide. LCMS: 482.1 (M+1)+, 97.99%, 1H NMR (DMSO-d6): δ 8.6 (t, 1H), 8.0 (m, 2H), 7.78-7.5 (m, 4H), 7.6-7.4 (m, 5H), 7.0 (d, 1H), 6.7 (t, 1H), 4.7 (d, 1H), 4.3 (m, 1H), 4.2 (d, 2H), 4.0-3.7 (m, 2H), 3.2 (m, 2H), 2.8 (m, 2H), 2.0 (m, 3H), 1.6-1.2 (m, 4H).
