Ethyl 8-methyl-1,4-dioxaspiro[4.5]decane-8-carboxylate → Ethyl 1-methyl-4-oxocyclohexanecarboxylate

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Ethyl 8-methyl-1,4-dioxaspiro[4.5]decane-8-carboxylate (Int-18b, 2.09 g, 9.17 mmol) was dissolved in acetonitrile (100 mL) and water (50 mL). Ammonium cerium nitrate (503 mg, 0.92 mmol) in water (50 mL) was added and the resulting mixture was heated up to 70° C. and stirred for 1 h. After being cooled down to room temperature, water (100 mL) was added and the mixture was extracted with ether (100 mL×3). The combined organics were washed with water, brine and dried. After concentration, the residue was purified on a column (silica gel, 0-30% ethyl acetate in hexane) which gave ethyl 1-methyl-4-oxocyclohexanecarboxylate (Int-18c) (1.72 g) as an oil.

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