Gamma-Aminobutyric Acid → 4-[(phenylsulfonyl)amino]butanoic acid

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Reaction Steps

7 G of gamma-aminobutyric acid was dissolved in 120 mL of 1N sodium hydroxide solution, and 15 g of benzenesulfonyl chloride was dropwise added thereto under ice-cooling. 2N sodium hydroxide solution was added to the mixture to adjust the pH to 9.2 and stirred for 4 hours. The stirred mixture was washed with 50 mL of ethyl acetate, and hydrochloric acid was added thereto to adjust the pH to 2 or less. After extracting with 500 mL of ethyl acetate, this was dried with magnesium sulfate and filtered. After a concentration under reduced pressure, the obtained residue was recrystallized with ethanol solution to give 13 g of the desired product.

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