[CH3:1][C@H:2]1[CH2:7][C:6](=[O:8])[CH2:5][C@H:4]([CH3:9])[NH:3]1.C(N(CC)CC)C.[Cl:17][C:18]1[CH:23]=[CH:22][C:21]([S:24](Cl)(=[O:26])=[O:25])=[CH:20][CH:19]=1>C(Cl)Cl>[Cl:17][C:18]1[CH:23]=[CH:22][C:21]([S:24]([N:3]2[C@@H:4]([CH3:9])[CH2:5][C:6](=[O:8])[CH2:7][C@@H:2]2[CH3:1])(=[O:26])=[O:25])=[CH:20][CH:19]=1trans-2,6-Dimethylpiperidin-4-one (93; 5.2 g, 39 mmol) was dissolved in CH2Cl2 (100 mL) and triethylamine (22 mL, 155 mmol) was added. The solution was stirred and treated with 4-chlorobenzenesulfonyl chloride (9.2 g, 43 mmol). The mixture was stirred for 24 hr and then partitioned between water (300 mL) and CH2Cl2 (300 mL). The organic layer was washed with 0.2 N citric acid, water, brine, dried over Na2SO4, filtered and the solvent evaporated. The residue (6.7 g) was purified by flash chromatography, eluting with EtOAc-hexane (1:3) mixture to yield 3.6 g (35%, 2 steps) of product 94.
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