[CH3:1][S:2]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[CH2:15][CH2:14][C:13](=[O:16])[C:12]=2[C:17]2[CH:18]=[N:19][CH:20]=[CH:21][CH:22]=2)=[CH:7][CH:6]=1)(=[O:4])=[O:3].[ClH:23]>C(Cl)Cl>[ClH:23].[CH3:1][S:2]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[CH2:15][CH2:14][C:13](=[O:16])[C:12]=2[C:17]2[CH:18]=[N:19][CH:20]=[CH:21][CH:22]=2)=[CH:7][CH:6]=1)(=[O:4])=[O:3]To a solution of 3-(4-(methylsulfonyl)phenyl)-2-(3-pyridinyl)-2-cyclopenten-1-one (5.0 g, 15.96 mmol) in CH2Cl2 (50 mL) was passed a stream of HCl gas for 10 min. Excess HCl was removed by bubbling a stream of air through the solution. The solution was then concentrated and swished in Et2O to give 5.7 g of the title compound.
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