Water → 2-Chloro-4-methylsulfonyl-3-(3-oxetanyloxy)benzoic acid

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Reaction Steps

A mixture of 0.76 g (19 mmol) of 60 percent in mineral oil sodium hydride in dry N,N-dimethylformamide was prepared in a flask under a nitrogen blanket and to it was added 2.02 g (8.0 mmol) of 2-chloro-3-fluoro-4-methylsulfonylbenzoic acid in portions with stirring at ambient temperature. The mixture was allowed to cool and then 0.71 g (9.6 mmol) of 3-hydroxyoxetane was added dropwise with stirring. There was an exotherm. After one hour, the reaction appeared to be complete and water was added cautiously. The resulting aqueous solution was extracted with ether and was then acidified with 1N aqueous hydrochloric acid. The resulting mixture was extracted three times with ethyl acetate and the three extracts were combined, washed with water, dried over magnesium sulfate, and concentrated by evaporation under reduced pressure. The residue was crystallized with a mixture of acetone and hexane to obtain 1.41 g of the title compound as white crystals melting at 180-183° C.

Provenance & Evidence