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To a stirred solution of 2-(3-cyano-benzyl)-1,1-dioxo-1λ6-isothiazolidine-3-carboxylic acid methyl ester (6.0 g, 20.4 mmol) in a tetrahydrofuran-water mixture (4:1, 50 mL), lithium hydroxide monohydrate (2.5 g, 59.6 mmol) was added at room temperature and stirred at this temperature for 4 h. Then tetrahydrofuran was removed from the reaction mixture under reduced pressure. The residual reaction mixture was cooled to 0° C. and 1N hydrochloric acid was added to make the pH˜2. The acidified reaction mixture was extracted with ethyl acetate (3×150 mL). The combined organic layers were washed with water (2×50 mL) followed by brine (50 mL) and then dried over sodium sulfate and concentrated under reduced pressure to provide 2-(3-cyano-benzyl)-1,1-dioxo-1λ6-isothiazolidine-3-carboxylic acid (5.2 g, 91%).

1. customThen tetrahydrofuran was removed from the reaction mixture under reduced pressure
2. customThe residual reaction mixture
3. customThe acidified reaction mixture
4. extractionwas extracted with ethyl acetate (3×150 mL)
5. washThe combined organic layers were washed with water (2×50 mL)
6. dry with materialdried over sodium sulfate
7. concentrationconcentrated under reduced pressure