Diethyl Malonate → 1,3-Diethyl 2-(3-oxocyclohexyl)propanedioate

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A solution of cyclohex-2-enone (3.05 mL, 30 mmol) and diethyl malonate (4.58 mL, 30.0 mmol) in THF (30 mL) was treated with 1,8-diazabicyclo[5.4.0]undec-7-ene (4.52 mL, 30.0 mmol) and heated at 50° C. for 16 h. The cooled mixture was poured into EtOAc and washed sequentially with 1M aqueous HCl and brine. The combined aqueous layers were extracted with EtOAc, and the combined organic phases were dried and concentrated to give diethyl 2-(3-oxocyclohexyl)malonate as an oil (8.0 g), used without further purification. Mass spectrum m/z 257 (M+H)+.

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