Triacetoxyperiodinane → tert-butyl N-(2-oxocyclopentyl)carbamate

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Dess-Martin periodinane (2.72 g, 6.41 mmol) was added to a stirred solution of tert-butyl 2-hydroxycyclopentylcarbamate (1.23 g, 6.11 mmol, from Step 1) in dichloromethane (30 mL) while the reaction container was placed in a room temperature water bath. After 1.5 h at room temperature, the mixture was quenched with 1 M aqueous sodium thiosulfate. After shaking the mixture vigorously, the dichloromethane phase was separated and concentrated. Silica gel chromatography, eluting with 0 to 50% ethyl acetate in hexanes, gave tert-butyl 2-oxocyclopentylcarbamate as white crystalline solid (824.6 mg, 68% yield). 1H NMR (400 MHz, chloroform-d) δ ppm 5.03 (1 H, br. s.), 3.90 (1 H, br. s.), 2.56 (1 H, br. s.), 2.38 (1 H, dd, J=19.15, 8.80 Hz), 2.08-2.22 (1 H, m), 1.96-2.08 (1 H, m), 1.73-1.89 (1 H, m), 1.52-1.69 (1 H, m), 1.42 (9 H, s).

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