Methyl Isocyanate → Ethyl 1-(n-methylaminocarbonyl)-4-oxo-3-piperidinecarboxylate

Beteiligte Stoffe

Reaktionsschritte

Commercially available ethyl 4-piperidone-3-carboxylate hydrochloride (203.2 mg; 0.98 mmol) was suspended in dichloromethane (7 ml), diisopropylethylamine (180 μl; 0.99 mmol) was added, followed by commercially available methyl isocyanate and (57 μl; 0.98 mmol). This mixture was stirred at ambient temperature for approximately 3 hours, and then diluted with fresh dichloromethane and washed with water. The dichloromethane solution was dried with anhydrous potassium carbonate and evaporated at ambient temperature under reduced pressure, giving ethyl 1-(N-methylaminocarbonyl)-4-oxo-3-piperidinecarboxylate (74.4 mg) as a white solid. MS m/z (positive ion) 479 (dimer+Na+; 40), 457 (dimer+; 25), 251 (M+Na+; 100), 229 (MH+; 90), 205 (25), 130 (25).

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