tert-butyl 4-hydroxy-2-oxopiperidine-1-carboxylate

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 100-mL round-bottom flask was charged with a solution of tert-butyl 4-hydroxy-2-oxopiperidine-1-carboxylate (1.00 g, 4.65 mmol) in dichloromethane (30 mL). Triethylamine (1.03 mL, 7.42 mmol) and 4-dimethylaminopyridine (0.057 g, 0.47 mmol) were added, and the mixture was cooled to 0° C. Methanesulfonyl chloride (0.47 mL, 6.05 mmol) was added dropwise and the resulting solution stirred for 1 h at room temperature. The reaction mixture was washed with water (2×10 mL) and 0.1 M aqueous HCl solution (2×10 mL), dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford tert-butyl 4-(methylsulfonyloxy)-2-oxopiperidine-1-carboxylate (0. 900 g, 66%) as a brown solid. MS (ESI, pos. ion) m/z 294 [M+H]+. The reaction mixture was washed with water (2×10 mL) and 0.1 M aqueous HCl solution (2×10 mL) dried over anhydrous sodium sulfate filtered concentrated under vacuum

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 100-mL round-bottom flask was charged with a solution of tert-butyl 4-hydroxy-2-oxopiperidine-1-carboxylate (1.00 g, 4.65 mmol) in dichloromethane (30 mL). Triethylamine (1.03 mL, 7.42 mmol) and 4-dimethylaminopyridine (0.057 g, 0.47 mmol) were added, and the mixture was cooled to 0° C. Methanesulfonyl chloride (0.47 mL, 6.05 mmol) was added dropwise and the resulting solution stirred for 1 h at room temperature. The reaction mixture was washed with water (2×10 mL) and 0.1 M aqueous HCl solution (2×10 mL), dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford tert-butyl 4-(methylsulfonyloxy)-2-oxopiperidine-1-carboxylate (0. 900 g, 66%) as a brown solid. MS (ESI, pos. ion) m/z 294 [M+H]+. The reaction mixture was washed with water (2×10 mL) and 0.1 M aqueous HCl solution (2×10 mL) dried over anhydrous sodium sulfate filtered concentrated under vacuum