[CH3:1]C([O-])(C)C.[K+].[Br:7][C:8]1[CH:9]=[C:10]([C:14]([C:16]2[CH:21]=[CH:20][CH:19]=[C:18]([Br:22])[CH:17]=2)=[O:15])[CH:11]=[CH:12][CH:13]=1.[I-].C[S+](C)C>CS(C)=O.C(OCC)(=O)C>[Br:7][C:8]1[CH:9]=[C:10]([C:14]2([C:16]3[CH:21]=[CH:20][CH:19]=[C:18]([Br:22])[CH:17]=3)[CH2:1][O:15]2)[CH:11]=[CH:12][CH:13]=1KOt-Bu (2.72 g, 24.26 mmol) was added to a stirred suspension of bis(3-bromophenyl)methanone (7.5 g, 22.06 mmol) and trimethylsulfonium iodide (4.50 g, 22.06 mmol) in DMSO (20 mL) and the resulting mixture was stirred at 30° C. for 8 h. The mixture was diluted with ethyl acetate (500 mL), washed with water (500 mL×3) and brine (500 mL). The organic layer was separated and evaporated in vacuo to afford the title compound which was used directly without further purification.
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