[C:1]([C:4]1[C:9]([O:10][CH2:11][CH2:12][CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])=[C:8]([CH2:19][CH2:20][CH3:21])[C:7]([SH:22])=[CH:6][CH:5]=1)(=[O:3])[CH3:2].Br[CH2:24][CH2:25][CH2:26][S:27][C:28]1[CH:33]=[CH:32][C:31]([C:34](=[O:36])[CH3:35])=[C:30]([OH:37])[C:29]=1[CH2:38][CH2:39][CH3:40].[I-].[K+].C(=O)([O-])[O-].[K+].[K+]>CC(C)=O>[C:1]([C:4]1[C:9]([O:10][CH2:11][CH2:12][CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])=[C:8]([CH2:19][CH2:20][CH3:21])[C:7]([S:22][CH2:24][CH2:25][CH2:26][S:27][C:28]2[CH:33]=[CH:32][C:31]([C:34](=[O:36])[CH3:35])=[C:30]([OH:37])[C:29]=2[CH2:38][CH2:39][CH3:40])=[CH:6][CH:5]=1)(=[O:3])[CH3:2]A mixture of ethyl 4-(6-acetyl-3-mercapto-2-propylphenoxy)butyrate (2.0 g), (4-(3-bromopropylthio)-2-hydroxy-3-propylphenyl)ethanone (2.0 g), potassium iodide (0.5 g) and potassium carbonate (1.7 g) in acetone (40 ml) was heated with refluxing and stirring for 9 hours. After cooled, inorganic materials were separated by filtration and the filtrate was concentrated. The resultant residue was separated, and was purified through silicagel column chromatography (eluting with benzene:ethyl acetate=9:1) to give the title compound (1.8 g, 50.8%) as yellow oil.
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