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To a stirred solution of 1,1-dioxo-1λ6-isothiazolidine-3-carboxylic acid methyl ester (Intermediate 1, 0.200 g, 1.10 mmol) in N,N-dimethylformamide (5 mL) was added potassium carbonate (0.450 g, 3.20 mmol) at room temperature under nitrogen. The reaction mixture was cooled to 0° C. and 3-cyano benzyl bromide (available from Aldrich; 0.240 g, 1.22 mmol) was added into the reaction mixture slowly and followed by the addition of tetra-n-butylammonium (0.025 g, 0.07 mmol). The reaction was completed in 5 h at room temperature as monitored by silica TLC. The reaction mixture was diluted with ethyl acetate (25 mL), washed with water (3×15 mL), dried over sodium sulfate and concentrated under reduced pressure to provide crude material, which was purified by silica gel column chromatography (100-200 mesh) using a gradient of 20-30% ethyl acetate/hexanes to give 2-(3-cyano-benzyl)-1,1-dioxo-1λ6-isothiazolidine-3-carboxylic acid methyl ester (0.170 g, 56%).

1. washwashed with water (3×15 mL)
2. dry with materialdried over sodium sulfate
3. concentrationconcentrated under reduced pressure
4. customto provide crude material, which
5. customwas purified by silica gel column chromatography (100-200 mesh)