Cl[CH:2]([C:10](=[O:13])[CH2:11][CH3:12])[C:3](=[O:9])[C:4]([O:6][CH2:7][CH3:8])=[O:5].[Cl:14][C:15]1[CH:16]=[C:17]([SH:22])[CH:18]=[C:19]([Cl:21])[CH:20]=1.C(=O)([O-])[O-].[K+].[K+].[I-].[Na+]>CC(C)=O.O>[Cl:14][C:15]1[CH:16]=[C:17]([S:22][CH:2]([C:10](=[O:13])[CH2:11][CH3:12])[C:3](=[O:9])[C:4]([O:6][CH2:7][CH3:8])=[O:5])[CH:18]=[C:19]([Cl:21])[CH:20]=1
A solution of ethyl 3-chloro-2,4-dioxohexanoate (EP117082 A2) (7.10 g, 34.4 mmol) in acetone (175 ml) was treated with 3,5-dichlorothiophenol (6.16 g, 34.4 mmol), potassium carbonate (5.22 g, 37.8 mmol) and sodium iodide (5.16 g, 34.4 mmol) and the resulting mixture was stirred at room temperature for 18 hours. The reaction mixture was diluted with water (70 ml) and concentrated under reduced pressure. The residue was diluted with 2M aqueous hydrochloric acid (70 ml) and extracted with dichloromethane (3×150 ml). The combined organic extracts were dried over anhydrous magnesium sulphate, filtered and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica gel eluting with a solvent gradient of cyclohexane:ethyl acetate (3:1, by volume) gradually changing to cyclohexane:ethyl acetate (1:1, by volume) to afford the title compound (12.3 g) as a red oil.
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