[Br:1][C:2]1[CH:3]=[C:4]([C:8](=[O:16])[CH2:9][C:10]2[CH:15]=[CH:14][N:13]=[CH:12][CH:11]=2)[CH:5]=[CH:6][CH:7]=1.BrCBr.[C:20](=[S:22])=[S:21].[C:23]([O-])([O-])=O.[K+].[K+]>CS(C)=O>[Br:1][C:2]1[CH:3]=[C:4]([C:8](=[O:16])[C:9](=[C:20]2[S:22][CH2:23][S:21]2)[C:10]2[CH:11]=[CH:12][N:13]=[CH:14][CH:15]=2)[CH:5]=[CH:6][CH:7]=11-(3-Bromo-phenyl)-2-pyridin-4-yl-ethanone (150 mg, 0.54 mmol), dibromomethane (114 ul, 1.62 mmol) and carbon disulfide (77 ul, 1.62 mmol) were reacted at room temperature in dry DMSO in the presence of K2CO3 (225 mg, 1.62 mmol) for three hours. The reaction, evaporated to dryness, was worked up with water and ethyl acetate. The pooled organic extracts were washed with brine, dried over sodium sulphate and evaporated down. The crude material was purified by a quick elution with ethyl acetate through a pad of silica to give the clean product in 74% yield.
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