Methanesulfonamide → 5-Bromo-N-methanesulfonylpentanamide

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A mixture consisting of methanesulfonamide (4.76 g) and 5-bromovaleric acid chloride (10 g) was heated at 85-90° C. for one hour, was cooled to room temperature, and was diluted with ethyl acetate (75 mL). The solution was washed with water, brine, and dried over sodium sulfate. The solution was filtered and evaporated to 40 mL of solvent, then cooled to −15° C. A white precipitate formed, which was collected by filtration to afford the title intermediate (11.4 g, 88%) as a white solid; melting point 98-100° C.

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