Ethyl Acetate → Benzyl 4-oxopiperidine-1-carboxylate

Participants

Reaction Steps

4-Piperidone hydrochloride hydrate (50.0 g, 325 mmol) and potassium bicarbonate (181.9 g, 1.82 mol) were combined in a two phase mixture of ethyl acetate (750 mL) and water (75 mL). Benzyl chloroformate (49 mL, 343 mmol) was added dropwise to the stirred mixture over 10 minutes. The mixture was stirred 2.5 hours, then it was diluted with water (700 mL) and the phases were separated. The aqueous layer was extracted with ethyl acetate and the combined organic phase was washed with water and brine. The organic phase was dried over magnesium sulfate and concentrated to a light yellow oil (76.75 g, 100%). The material was found to be analytically pure and suitable for further transformation without further workup. Analysis calculated for C13H15NO3 : C, 66.94; H, 6.48; N, 6.00. Found: C, 66.67; H, 6.48; N, 5.90.

Provenance & Evidence