[C:1]1([S:7][C:8]2[CH:13]=[CH:12][C:11]([CH2:14][CH2:15][CH2:16][C:17]([OH:19])=O)=[CH:10][CH:9]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C(Cl)(=O)C(Cl)=O.[Cl-].[Cl-].[Cl-].[Al+3]>O1CCCC1.CN(C=O)C>[C:1]1([S:7][C:8]2[CH:9]=[C:10]3[C:11]([CH2:14][CH2:15][CH2:16][C:17]3=[O:19])=[CH:12][CH:13]=2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1
4-(4-Phenylsulfanyl-phenyl)-butyric acid (5.0 g, 18.4 mmol) was dissolved in 50 mL tetrahydrofuran (THF). Oxalyl chloride (1.8 mL, 20 mmol) and one drop of DMF were added, and the reaction mixture was stirred for 1 hour, and then evaporated to dryness under reduced pressure. The resulting residue was dissolved in 40 mL of 1,2-dichloroethane, and aluminum trichloride (0.85 g, 25 mmol) was added all at once. The reaction mixture was stirred for 1 hour, and quenched by addition of 2% HCl. This aqueous mixture was extracted twice with 100 mL of EtOAc, and the combined organic layers were dried (MgSO4) and evaporated to yield 2.54 g (10 mmol, 55.5%) of 7-phenylsulfanyl-3,4-dihydro-2H-naphthalen-1-one as a gummy residue. MS: 255 (M+H)+.
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