[C:1]([C:4]1([NH:10][S:11]([CH2:14][C:15]2[CH:20]=[CH:19][C:18]([Cl:21])=[CH:17][CH:16]=2)(=O)=O)[CH2:9][CH2:8][CH2:7][CH2:6][CH2:5]1)(=O)[CH3:2].[H-].[Na+].O>CN(C=O)C>[Cl:21][C:18]1[CH:19]=[CH:20][C:15]([C:14]2[S:11][NH:10][C:4]3([CH2:9][CH2:8][CH2:7][CH2:6][CH2:5]3)[C:1]=2[CH3:2])=[CH:16][CH:17]=1To N-(1-acetylcyclohexyl)-(4-chlorophenyl)methane-sulfonamide (612 mg, 1.86 mmol), from Example 1, in dry DMF (6 mL) was added NaH (60%, 2.2 eq.) under Ar. The mixture was stirred overnight at 120° C., water was added and the solution was extracted with ethyl acetate. The organic layer was washed with NaCl solution and water, dried (Na2SO4) and concentrated. Recrystallization from ethyl acetate yielded 0.37 g (64%) of 3-(4-chlorophenyl)-4-methyl-2-thia-1-azaspiro[4.5]dec-3-ene, 2,2-dioxide, shown below as a solid. MS (IS): 312 [MH]+
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