Oxalyl chloride → 3-(Chlorosulfonyl)-4-fluorobenzoyl chloride

Participants

Reaction Steps

To a suspension of 3-chlorosulfonyl-4-fluoro benzoic acid (2.5 g, 10 mmol) in methylene chloride at 0° C. is added oxalyl chloride (1.33 g, 11 mmol), followed by the addition of 1 drop of N,N,-dimethylformamide. The reaction mixture is warmed up to room temperature and stirred for an additional 4 h. The solvent is removed, and the residue is dried under vacuum for 1 hr to obtain the title compound as an oil, which is used for the next step without further purification.

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