Hydrochloric Acid → 1-(2-Fluoro-4-methoxyphenyl)-2-(methylsulfonyl)ethanone

Participants

Reaction Steps

To a solution of 4.15 g (44.07 mmol) of dimethylsulfone in 140 ml of anhydrous tetrahydrofuran are added dropwise at −10° C. under argon 24 ml of methyllithium solution (1.6M in diethyl ether, 38.2 mmol). The reaction mixture is stirred for 15 min at room temperature, the reaction mixture is then cooled to −60° C. A solution of 5.54 g (29.38 mmol) of 2-fluoro-4-methoxybenzoyl chloride dissolved in 60 ml of tetrahydrofuran is then added dropwise to the reaction mixture. This mixture is stirred for 4 h at between −60° C. and 0° C., then a 1M hydrochloric acid solution is added. The product is extracted several times with ethyl acetate. The organic phases are combined, dried over magnesium sulfate and concentrated. The residue is triturated in minimum methanol and the solid is filtered to yield 3.33 g (46%) of 1-(2-fluoro-4-methoxyphenyl)-2-(methylsulfonyl)ethanone in the form of a white solid.

Provenance & Evidence