Dimethyl Disulfide → 2-Chloro-5-(methylthio)pyrimidine

Beteiligte Stoffe

Reaktionsschritte

A solution of 1.00 g (5.17 mmol) of 5-bromo-2-chloropyrimidine and 551 μl (6.20 mmol) of dimethyl disulfide in 26 ml of tetrahydrofuran was cooled to −78° C. and 1.89 ml (5.17 mmol) of 2.73 N n-butyl lithium/n-hexane solution was added thereto, and the reaction solution was stirred for 2 hours. After completion of the reaction, saturated ammonium chloride aqueous solution was added to the reaction solution and the reaction solution was extracted with ethyl acetate. The organic layer was washed with saturated sodium chloride aqueous solution and dried with anhydrous sodium sulfate, and then the solvent was distilled off under reduced pressure. The obtained residue was subjected to silica gel column chromatography [n-hexane/ethyl acetate=90/10 (V/V)] and the fraction including the desired compound was concentrated under reduced pressure to provide 149 mg of the title compound as a white solid (yield: 18%).

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