Ethyl 2-oxocyclohexylacetate → (2-Benzyloxyimino-cyclohexyl)-acetic acid ethyl ester

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Ethyl 2-cyclohexanoneacetate (4.28 g, 23.3 mmol) and O-benzyl hydroxylamine hydrochloride were combined in 100 mL of ethanol (EtOH) and 2.59 g (25.6 mmol, 3.55 mL) of triethyl amine(Et3N) was added. The reaction was stirred at room temperature for 12 hours at which point it was concentrated in vacuo. The residue was taken up in EtOAc and washed with 1N HCl (2×20 mL), saturated NaHCO3 (1×20 mL), dried over Na2SO4, filtered, and concentrated. Purification by chromatography (SiO2, 90:1 hexanes-EtOAc) afforded (2-benzyloxyimino-cyclohexyl)-acetic acid ethyl ester (4.76 g, 72%) as a mixture of oxime isomers.

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