[Br:1][C:2]1[C:6]2[N:7]([CH2:13][C:14]3[CH:19]=[CH:18][C:17]([C:20]([F:23])([F:22])[F:21])=[CH:16][CH:15]=3)[C:8](C(O)=O)=[CH:9][C:5]=2[S:4][CH:3]=1.Cl>N1C2C(=CC=CC=2)C=CC=1.[Cu]>[Br:1][C:2]1[C:6]2[N:7]([CH2:13][C:14]3[CH:15]=[CH:16][C:17]([C:20]([F:23])([F:22])[F:21])=[CH:18][CH:19]=3)[CH:8]=[CH:9][C:5]=2[S:4][CH:3]=1A mixture of 3 g of the product of Step 4 and 0.3 g of copper powder in 50 ml of quinoline was heated in oil bath at 140° C. for 4 h. The reaction mixture was cooled and acidified with 6 N HCl and then extracted with 150 ml of ether. The ether layer was washed with 200 ml of 2 N HCl, dried over Na2SO4, filtered, and concentrated to give 2.2 g of the title compound as a light brown solid.
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