[Br:1][C:2]1[CH:3]=[CH:4][C:5]([F:13])=[C:6]([CH:8]=[CH:9][C:10](O)=[O:11])[CH:7]=1.S(Cl)([Cl:16])=O>>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([F:13])=[C:6]([CH:8]=[CH:9][C:10]([Cl:16])=[O:11])[CH:7]=13-(5-Bromo-2-fluoro-phenyl)-acrylic acid (1.3 g, 5.0 mmol) prepared in Step 1 was added to thionyl chloride (10.0 mL). The reaction mixture was stirred at 100° C. for 2 hours and then concentrated under reduced pressure. The resulting residue was concentrated under reduced pressure three times, along with using toluene, to give 1.4 g of the titled compound as an unpurified dark brown liquid.
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