m-Chloroperbenzoic acid → 4-Chloro-2-(ethylsulfinyl)-6-methyl-benzonitrile

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Reaction Conditions

Reaction Steps

To a stirred solution of 4-chloro-2-ethylsulfanyl-6-methyl-benzonitrile (synthesized according to the method described in section a) of example 2) (1.00 g, 4.73 mmol) in dichloromethane (20 ml) is added meta-chloroperoxybenzoic acid (0.58 g, 2.36 mmol, 70% suspension) portion wise at 0° C. The resulting mixture is stirred at 0° C. for 15 min. The white suspension is dissolved in ethyl acetate (25 ml) and the solvent is distilled off. The residue is again diluted with ethyl acetate (15 ml) and washed with 10% sodium sulphite solution (3×15 ml), saturated sodium hydrogen sulfate solution (3×15 ml), brine (15 ml), dried over anhydrous sodium sulfate and evaporated to get the crude product, which is purified by column chromatography (silica gel, 8% ethyl acetate/hexane) to yield 4-chloro-2-(ethylsulfinyl)-6-methyl-benzonitrile (0.4 g, 1.76 mmol, 37%).

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