A mixture of 2-(4-fluorophenyl)-3-(4-((E)-3-methoxy-3-oxoprop-1-en-1-yl)phenyl)acrylic acid (0.23 g, 0.71 mmol) and cyclopropylamine (0.03 g, 0.60 mmol), EDCI (0.27 g, 1.4 mmol), HOBt (0.10 g, 0.71 mmol) was dissolved in N,N-dimethylformamide (DMF) (6 mL) under stirring. Triethylamine (TEA) (0.75 mL, 36 mmol) was added dropwise with constant stirring to the above reaction mixture and it was stirred at 30° C. for 2 hours. Subsequently the reaction mixture was diluted with ethyl acetate and washed successively with water (3×50 mL) and brine (3×50 mL). The organic layer was dried over anhydrous Na2SO4 and concentrated to afford the pure compound (0.25 g, 96% yield).
