Methanesulfonyl chloride → Tert-butyl 4-(2-(methylsulfonamido)ethyl)piperazine-1-carboxylate

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Reaction Steps

Methanesulfonyl chloride (0.7 mL, 9.0 mmol) was added to a cooled solution of 4-(2-amino-ethyl)-piperazine-1-carboxylic acid tert-butyl ester (1.33 g, 5.8 mmol) in pyridine (25.0 mL). The reaction was stirred for 12 h and partitioned between partitioned between aqueous sodium bicarbonate and methylene chloride. The organic phase was washed with 1 M hydrochloric acid, aqueous sodium bicarbonate, and brine, dried over anhydrous magnesium sulfate and concentrated. Purification of the crude residue by chromatography over silica gel using 0-5% methanol in methylene chloride gave 4-(2-methanesulfonylamino-ethyl)-piperazine-1-carboxylic acid tert-butyl ester (0.70 g, 70%).

Provenance & Evidence