DIPEA (133 mg, 0.18 mL, 0.56 mmol) was added drop wise to 4-phenylamino-benzoic acid (preparation as described above) (75 mg, 0.35 mmol) in DMF (4 mL). EDCI (167 mg, 0.87 mmol) and HOBT (56 mg, 0.42 mmol) were added consecutively and, after 10 minutes, 2-amino-1-[4-(2,4-dichloro-benzoyl)-piperazin-1-yl]-ethanone in its TFA salt form (180 mg, 0.42 mmol) was added. The resulting mixture was stirred at room temperature overnight. Cold water was then added, filtered the solid precipitated. The solid was purified by column chromatography (using silica gel of 60-120 mesh and 70% EtOAc in Hexane as eluent) to afford 95 mg (53% yield) of N-{2-[4-(2,4-Dichloro-benzoyl)-piperazin-1-yl]-2-oxo-ethyl}-4-phenylamino-benzamide. LC-MS purity: 96.05%. 1H-NMR (DMSO-D6): δ 8.6 (s, 1H), 8.3 (t, 1H), 7.8 (d, 3H), 7.5 (m, 2H), 7.3 (t, 2H), 7.2 (d, 2H), 7.1 (d, 2H), 6.9 (t, 1H), 4.1 (dd, 2H), 3.6 (m, 4H), 3.5 (m, 2H), 3.2 (m, 2H).
