4-Fluorobenzenesulfonyl chloride → N1-[4-(aminomethyl)cyclohexyl]methyl-4-fluoro-1-benzenesulfonamide

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A solution of 2.37 g of 4-fluorophenylsulfonyl chloride (12.2 mmol) in 30 ml of dichloromethane was added over 10 minutes to a stirred solution of 5.20 g of 1,4-bis-aminomethylcyclohexane (36.6 mmol) and 3.15 g of diisopropylethylamine (24.4 mmol) in 100 ml of dichloromethane at room temperature. The reaction mixture was stirred at room temperature for 16 hours, concentrated, and chromatographed on 200 g of silica packed with 5% MeOH (containing 2M NH3)—CHCl3, eluted with 5%, 7.5%, 10% (1 liter each) to give 3.63 g of the desired product.

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