1,2-Dichloroethane → 1-(2-Trifluoromethoxyphenylacetyl)-2-carbamoyl-4-(2-methylphenyl)-piperazine

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Reaction Steps

To a stirred solution of 2-trifluoromethoxyphenylacetic acid (0.10 g, 0.48 mmol) from Step 4 above and 2-carbamoyl-4-(2-methylphenyl)piperazine (0.10 g, 0.46 mmol) from Step 4 of Example 1 in DMF (10 mL) was added HOBT (0.075 g, 0.5 mmol), EDC (0.22 g, 0.75 mmol), and DIEA (0.13 mL, 0.75 mmol). The solution was stirred at ambient temperature for 14 h and the solvent was removed under reduced pressure. The residue was partitioned between EtOAc (50 mL) and 0.25 M aqueous citric acid (25 mL). The organic phase was separated and washed with H2O (25 mL), saturated aqueous NaHCO3 (25 mL), and brine (25 mL). The organic phase was dried (MgSO4), filtered, and the solvent was removed under reduced pressure. The residue was purified by pressurized silica gel column chromatography using EtOAc as eluant. The product-containing fractions were evaporated under reduced pressure and the residue was lyophilized from CH3CN:H2O to give the title compound as an amorphous solid.

Provenance & Evidence