To a stirred solution of 2-(2,2,2-trifluoroethoxy)-3-chlorophenylacetic acid (0.14 g, 0.53 mmol) from Step 4 above, 2-carbamoyl-4-(2-methylphenyl)piperazine (0.12 g, 0.53 mmol) from Step 4 of Example 1, and HOBT (0.08 g, 0.53 mmol) in DMF (5 mL) was added EDC (0.15 g, 0.8 mmol) and DIEA (0.14 mL, 0.8 mmol). The mixture was stirred at ambient temperature for 14 h. The solvent was removed under reduced pressure and the residue was purified by preparative reverse phase HPLC using a H2O:CH3CN gradient containing 0.1% TFA. The product-containing fractions were lyophilized to give the title compound as an amorphous powder.
