Potassium Bromide → Benzyl 3-formylpiperidine-1-carboxylate

Beteiligte Stoffe

Reaktionsschritte

An aqueous solution (2 mL) of potassium bromide (983 mg, 8.26 mmol) was added to 1-benzyloxycarbonyl-3-piperidinyl methanol (2.00 g, 8.02 mmol) and 2,2,6,6-tetramethyl piperidine-N-oxyl (12.5 mg, 0.0802 mmol) in dichloromethane (20 mL). The mixture was stirred for 5 min while chilled in an ice bath. A 0.35 mol/L aqueous sodium hypochlorite solution (25.2 mL, 8.82 mmol) and sodium bicarbonate (1.96 g, 23.3 mmol) were added and the mixture was stirred for 10 min. Subsequently, the reaction mixture was extracted with ethyl acetate and the extract washed with brine, followed by drying over magnesium sulfate and evaporation of the solvent. Purification of the residue by silica gel column chromatography (hexane:ethyl acetate=10:1->2:1) gave 1.78 g (90%) of the desired compound as a colorless oil.

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