I[C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][CH:10]=1)[C:5]([OH:7])=[O:6].[C:11]([O:15][CH2:16][CH3:17])(=[O:14])[CH:12]=[CH2:13].C(N(CC)CC)C>CN(C=O)C.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH2:16]([O:15][C:11](=[O:14])/[CH:12]=[CH:13]/[C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][CH:10]=1)[C:5]([OH:7])=[O:6])[CH3:17]A solution of 3-iodobenzoic acid (20.2 g, 81.4 mmol), ethyl acrylate (9.0 g, 90.2 mmol), triethylamine (24 mL) and palladium acetate (92 mg, 0.41 mmol) in DMF (130 mL) was stirred at 140° C. for 3 hr. The reaction mixture was cooled to room temperature, partitioned between ethyl acetate and 1N hydrochloric acid, and the ethyl acetate layer was washed with water and saturated brine, dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure and the obtained residue was purified by silica gel column chromatography (hexane:ethyl acetate 50:50-0:100) to give the title compound (18.7 g, quant.) as an orange solid.
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