[Al+3].[Cl-].[Cl-].[Cl-].Cl[C:6]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[O:7].[F:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[S:20][CH3:21].C(OCC)(=O)C>C(Cl)(Cl)Cl.CCCCCC>[F:13][C:14]1[CH:19]=[C:18]([C:6](=[O:7])[C:8]([O:10][CH2:11][CH3:12])=[O:9])[CH:17]=[CH:16][C:15]=1[S:20][CH3:21]To a solution of AlCl3 (9.2 g, 0.06 mol, 2 eq) in chloroform (50 mL) cooled at 0° C., ethyl (chlorocarbonyl)formate (7.3 g, 0.05 mol, 1.6 eq) was added drop wise and the reaction mixture was stirred for 30-45 min at the same temperature. (2-fluorophenyl)(methyl)sulfane (5 g, crude) was added at 0° C. and the reaction mixture was stirred for 4 h at room temperature. Progress of the reaction was monitored by TLC (5% ethyl acetate in n-hexane, Rf˜0.5). On completion of the reaction, crushed ice was added and the mixture was stirred for some time. The organic layer was separated and the aqueous layer was extracted with DCM (2×50 mL). The combined extract was washed with NaHCO3 solution, dried over sodium sulfate and concentrated under reduced pressure to yield ethyl 2-(3-fluoro-4-(methylthio)phenyl)-2-oxoacetate as an yellow colored liquid (5.5 g).
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