[OH:1][CH:2]1[CH2:6][CH2:5][CH2:4][CH:3]1[NH:7][S:8]([CH:11]([CH3:13])[CH3:12])(=[O:10])=[O:9].C(N(CC)CC)C.O>C(Cl)Cl>[CH3:13][CH:11]([S:8]([NH:7][CH:3]1[CH2:4][CH2:5][CH2:6][C:2]1=[O:1])(=[O:10])=[O:9])[CH3:12]Scheme IA, step C: Into a flame dried 500 mL 3 neck flask fitted with a thermometer and magnetic stirrer, DMSO (6.16 mL) in methylene chloride (20 mL) was added dropwise to oxalyl chloride (3.80 mL) in methylene chloride (100 mL) while stirring at −55° C. under a nitrogen atmosphere. After 2 minutes, (2-hydroxycyclopentyl)[(methylethyl)sulfonyl]amine (8.00 g, 38.6 mmol) in methylene chloride (45 mL) was added dropwise at this temperature and the reaction was stirred for an additional 15 minutes. Triethylamine (25.5 mL) was then added dropwise and the reaction was allowed to warm to room temperature. 180 mL of water was added at room temperature and the layers were separated. The organic layer was washed once with water, dried over potassium carbonate, filtered, and concentrated under reduced vacuum to yield 7.83 g as a dark oil. This material was purified via silica gel chromatography employing the Water's Prep. 2000 and eluting with a solvent of methylene chloride/ethyl acetate 9:1 to provide the intermediate title compound (5.76 g, 73%) as a yellow oil. Ion Spray M.S. 204.1 (M*−1). Calculated for C8H15NO3S: Theory: C, 46.81; H, 7.37; N, 6.82. Found: C, 46.56; H, 7.32; N, 6.77.
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