[CH3:1][O:2][C:3](=[O:14])[CH2:4][C:5]1[CH:10]=[CH:9][C:8]([O:11]C)=[CH:7][C:6]=1[CH3:13].[Cl-].[Al+3].[Cl-].[Cl-].C(S)C.O>ClCCl>[CH3:1][O:2][C:3](=[O:14])[CH2:4][C:5]1[CH:10]=[CH:9][C:8]([OH:11])=[CH:7][C:6]=1[CH3:13](4-Methoxy-2-methyl-phenyl)-acetic acid methyl ester (1.5 g, 7.72 mmol) is stirred in dichloromethane (50 mL) at 0 deg. C. Aluminum chloride (4.13 g, 31 mmol) is added followed by ethane thiol (2.9 mL, 38.6 mmol). The resulting mixture is stirred at room temperature for 2 hr. Water (50 mL) is added and the product is extracted into ethyl acetate (3×50 ml), the extracts are combined, dried over anhydrous magnesium sulfate, filtered, and concentrated to afford the title compound as a colorless oil, 1.4 g, 100%. MS M++1 181. The structure is confirmed by 1H NMR spectroscopy.
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