[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH2:15][CH:16](Cl)[C:17]([O:19][CH3:20])=[O:18])=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:22]1([S:28]([O-:30])=[O:29])[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1.[Na+].CN(C)C=O>O>[C:22]1([S:28]([CH:16]([CH2:15][C:12]2[CH:13]=[CH:14][C:9]([O:8][CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)=[CH:10][CH:11]=2)[C:17]([O:19][CH3:20])=[O:18])(=[O:30])=[O:29])[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1A mixture of methyl 3-(4-benzyloxyphenyl)-2-chloropropanoate (International Patent Appl., Publication No. WO 9101337) (0.50 g), sodium benzenesulphinate (0.29 g) and dry N,N-dimethylformamide (25 mL) was heated at 80° C. for 24 hrs. The mixture was cooled and diluted with water (500 mL), then extracted with dichloromethane (2×250 mL). The combined organic solutions were washed with water (2×250 mL) and brine (250 mL), dried (MgSO4) and evaporated. The residue was chromatographed on silica gel with dichloromethane as eluent to afford the title compound.
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