To a stirred solution of 1-{2-chloro-4-[5-(3,4,5-trichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-phenyl}-azetidine-3-carboxylic acid (Preparation 14, 0.1 g, 0.190 mmol) in dry DMF (3 mL) was added EDCl.HCl (0.055 g, 0.280 mmol), DIPEA (0.049 g, 0.380 mmol) and 2,2,2-trifluoro-ethylamine hydrochloride (0.026 g, 0.190 mmol) at 0° C. Resulting reaction mixture was stirred at room temperature for 18 hours under nitrogen atmosphere. After complete consumption of starting material, reaction mixture was quenched with water (50 mL), white solid was precipitated out, and solid was filtered, dried. Solid was purified by preparative TLC to afford off white solid (0.045 g, 41%). 1H-NMR (400 MHz, CDCl3) δ: 3.38-3.42 (m, 1H), 3.60 (d, 1H, J=17.08 Hz), 3.93-4.03 (m, 3H), 4.26-4.36 (m, 4H), 5.95 (t, 1H), 6.49 (d, 1H, J=8.52 Hz), 7.42 (dd, 1H, J1=8.56 Hz, J2=1.88 Hz), 7.47 (d, 1H, J=1.84 Hz), 7.62 (s, 2H); LC-MS (m/z): [M−H] 605.40.
