Water → 4'-Chloro-N-ethyl-2'-nitro-p-toluenesulfonanilide

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Reaction Steps

To a suspension of sodium hydride (60%, 0.05 g (1.25 mmol)) in DMF (2.0 ml), 4′-chloro-2′-nitro-p-toluenesulfonanilide (0.30 g (0.92 mmol)) was added with stirring at room temperature. To the resulting mixture, after 15 minutes' stirring at room temperature, ethyl iodide (0.50 ml (6.25 mmol)) was added dropwise. After one hour's heating at 100° C. with stirring, the reaction mixture was poured into water and extracted with ethyl acetate. The extract was washed with water and saturated sodium chloride solution, successively, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was subjected to silica gel column chromatography with ethyl acetate-hexane (1:3) as eluent, giving 0.24 g (74%) of the title compound as pale yellow crystals.

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