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tert-Butyl 2-pyridylmethylcarbamate (11.4 g, 54 mmol) and 3-chloroperbenzoic acid (77%, 5.9 g, 71 mmol) were dissolved in ethyl acetate (150 ml), and the mixture was stirred at room temperature for 15 hrs. The solvent was evaporated, and the residue was subjected to a silica gel column chromatography. The fractions eluted with methanol-ethyl acetate (1:5, v/v) were collected and concentrated to give the titled compound (11.1 g, 90%).

1. customThe solvent was evaporated
2. washThe fractions eluted with methanol-ethyl acetate (1:5
3. customv/v) were collected
4. concentrationconcentrated