Pyridine → 3-(2,5-Difluoro-benzenesulfonylamino)-2-fluoro-benzoic acid methyl ester

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Reaction Steps

To 3-amino-2-fluoro-benzoic acid methyl ester (72, 1.08 g, 6.4 mmol) in 40.64 mL of dichloromethane, pyridine (1.29 mL, 16 mmol) is added, followed by 2,5-difluorobenzenesulfonyl chloride (73, 3.391 g, 16 mmol). The reaction is stirred at room temperature overnight, then quenched with 1M aqueous hydrochloric acid. The organic layer is removed and the aqueous layer is extracted with dichloromethane. The organic layers are combined and washed with brine, then dried over sodium sulfate, filtered and the filtrate is concentrated under vacuum. The resulting material is purified by silica gel column chromatography, eluting with ethyl acetate and hexane. Appropriate fractions are combined and concentrated under vacuum to provide the desired compound (74, 0.956 g). MS (ESI) [M−H+]−=344.

Provenance & Evidence