[S:1]1[CH:5]=[CH:4][C:3]2[C:6](=[O:9])[CH2:7][CH2:8][C:2]1=2.[H-].[Na+].C1([O:18][C:19](=O)[C:20]2[CH:25]=[CH:24][C:23]([Br:26])=[CH:22][CH:21]=2)C=CC=CC=1.Cl>C1COCC1.O>[Br:26][C:23]1[CH:24]=[CH:25][C:20]([C:19]([CH:7]2[CH2:8][C:2]3[S:1][CH:5]=[CH:4][C:3]=3[C:6]2=[O:9])=[O:18])=[CH:21][CH:22]=1
5,6-Dihydro-cyclopenta[b]thiophen-4-one (3.34 g, 24.2 mmol) in 40 mL of THF was treated with NaH (60 percent, 1.45 g, 36.3 mmol). After the addition of 4-Bromo-benzoic acid phenyl ester (6.7 g, 24.2 mmol), the reaction mixture was heated at 100° C. for 8 hr. The solution was cooled to room temperature and poured into water. The resulting mixture was acidified with concentrated HCl and was extracted with ethyl acetate. The organic layer was collected, brined, dried over MgSO4(s), and concentrated under reduced pressure. The resultant precipitate was collected and recrystallized from ethanol to provide the corresponding 5-(4-Bromo-benzoyl)-5,6-dihydro-cyclopenta[b]thiophen-4-one (5.4 g, 16.9 mmol) as yellow solid in 70% yield.
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