Sodium Thiosulfate → 4-chloro-N-[5-chloro-2-(2-nitro-benzoyl)-pyridin-3-yl]-N-methoxymethyl-3-trifluoromethyl-benzenesulfonamide

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A mixture of 4-chloro-N-{5-chloro-2-[hydroxy-(2-nitro-phenyl)-methyl]-pyridin-3-yl}-N-methoxymethyl-3-trifluoromethyl-benzenesulfonamide (˜1.0 g) and Dess-Martin periodinane (1.50 g, 3.54 mmol) in CH2Cl2 (20 mL) at room temperature was stirred for 2-4 h. A mixture of 10% aqueous Na2S2O3 (10 mL) and saturated aqueous NaHCO3 (10 mL) was then added and the biphasic mixture vigorously stirred for 30 min. The phases were then separated and the aqueous portion extracted with CH2Cl2. The combined organic extracts were washed with saturated aqueous NaHCO3, then brine, dried (Na2SO4) and filtered. The filtrate was concentrated under reduced pressure and the residue purified by flash column chromatography over silica gel (EtOAc/hexanes, 1:4, then 2:3) to provide 4-Chloro-N-[5-chloro-2-(2-nitro-benzoyl)-pyridin-3-yl]-N-methoxymethyl-3-trifluoromethyl-benzenesulfonamide. Mass spectrum m/z: 586.3 (M+Na).

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