[Cl:1][C:2]1[C:16]([Cl:17])=[CH:15][C:5]2[NH:6][C:7]([C:9](=[O:14])[C:10]([F:13])([F:12])[F:11])=[N:8][C:4]=2[CH:3]=1.[CH2:18](Br)[CH:19]=[CH2:20].[In].Cl>C1COCC1>[Cl:17][C:16]1[C:2]([Cl:1])=[CH:3][C:4]2[NH:8][C:7]([C:9]([OH:14])([CH2:20][CH:19]=[CH2:18])[C:10]([F:13])([F:11])[F:12])=[N:6][C:5]=2[CH:15]=11-(5,6-Dichloro-1H-benzoimidazol-2-yl)-2,2,2-trifluoro-ethanone (1.41 g; 4.99 mmol), allyl bromide (0.85 mL; 10.05 mmol) and indium (1.15 g; 10.05 mmol) were suspended in THF (50 mL) and 0.01 M HCl (150 mL) and stirred vigorously over 18 hours. The layers were separated and the aqueous layer was extracted with ethyl acetate (3×30 mL). The combined extracts were washed with brine (50 mL) and dried over Na2SO4. The resulting crude brown oil was purified by column chromatography (SiO2; 20% ethyl acetate/hexanes) to yield the title compound as a tan solid.
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