A mixture of 2-ethyl-N-(3-fluoro-4-piperazin-1-yl-phenyl)-butyramide dihydrochloride (0.06 g, 0.16 mmol), bromo-(4-cyano-phenyl)-acetic acid methyl ester (0.05 g, 0.20 mmol), and anhydrous K2CO3 (0.08 g, 0.55 mmol) in DMF (5 mL) was stirred at rt for 20 h. The mixture was diluted with water (100 mL) and extracted with DCM (2×30 mL). The combined organic phases were washed with water, dried (Na2SO4), and concentrated. The residue was purified (SiO2; acetone/DCM) to give the title compound (0.06 g, 79%). MS: mass calcd. for C26H31FN4O3, 466.24. m/z found, 467.4 [M+H]+. 1H NMR (CDCl3): 7.68-7.60 (m, 4H), 7.45 (dd, J=14.0, 2.4, 1H), 7.27 (br s, 1H), 7.13-7.08 (m, 1H), 6.85 (t, J=9.0, 1H), 4.14 (s, 1H), 3.72 (s, 3H), 3.10-3.03 (m, 4H), 2.69-2.56 (m, 4H), 2.04-1.95 (m, 1H), 1.74-1.62 (m, 2H), 1.59-1.48 (m, 2H), 0.92 (t, J=7.4, 6H).
