[F:1][C:2]1[C:7]2[N:8]=[CH:9][S:10][C:6]=2[CH:5]=[C:4]([C:11]([O:13][CH3:14])=[O:12])[C:3]=1[NH:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=1[F:22].C1C(=O)N([I:30])C(=O)C1.FC(F)(F)C(O)=O.O>CN(C=O)C>[F:1][C:2]1[C:7]2[N:8]=[CH:9][S:10][C:6]=2[CH:5]=[C:4]([C:11]([O:13][CH3:14])=[O:12])[C:3]=1[NH:15][C:16]1[CH:21]=[CH:20][C:19]([I:30])=[CH:18][C:17]=1[F:22]To a solution of methyl 4-fluoro-5-((2-fluorophenyl)amino)benzo[d]thiazole-6-carboxylate (8.64 g, 26.97 mmol) in DMF (100 mL) was added NIS (6.68 g, 29.67 mmol) followed by trifluoroacetic acid (0.5 mL). After stirring for 5 h at ambient temperature, the reaction was treated by water (150 mL). The precipitate was filtered off and the filter cake was washed with water. The desired product was obtained as a yellow solid (10.34 g, 86.0% yield). 1H NMR (400 MHz, CDCl3): δ 9.14 (s, 1H), 8.66 (s, 1H), 8.46 (s, 1H), 7.42 (d, J=10.4 Hz, 1H), 7.31 (d, J=8.8 Hz, 1H), 6.63 (dd, J=15.0, 8.7 Hz, 1H), 3.97 (s, 3H).
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