Dimethyl Sulfide → Methyl 3-(methylthio)-1H-indole-6-carboxylate

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Reaction Conditions

Reaction Steps

Dimethyl sulfide (0.54 mL, 7.42 mmol) was added dropwise at 0° C. to a suspension of N-chlorosuccinimide (0.99 g, 7.42 mmol) in dichloromethane (10 mL). The reaction mixture was cooled to −20° C. and a solution of 1H-indole-6-carboxylic acid methyl ester (1.0 g, 5.71 mmol) in dichloromethane (10 mL) was added. The reaction mixture was warmed to room temperature and stirred for 1 h. The solvent was evaporated and the residue and xylene (50 mL) were refluxed at 140-150° C. for 1 h. The xylene was removed under vacuum and the remnant purified by column chromatography [100-200 mesh silica; dichloromethane/hexane=1:1]. Light brown solid. Yield: 0.9 g (71% of theory). HPLC-MS (method 5): Rt=3.26 min; m/z [M+H]+=222

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