反应详情

A mixture of 4-hydrazinocarbonyl-piperidine-1-carboxylic acid tert-butyl ester (WO 2000039125, prep 27) (3 g, 12.33 mmol), ethoxyacetic acid (1.28 mL, 13.56 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.6 g, 13.56 mmol), 1-hydroxybenzotriazole hydrate (1.83 g, 13.56 mmol) and triethylamine (2.1 mL, 14.8 mmol) in N,N-dimethylformamide (15 mL) was stirred at room temperature for 18 hours. The mixture was concentrated under reduced pressure and the residue was partitioned between ethyl acetate and aqueous sodium carbonate solution. The layers were separated, the organic phase was dried over MgSO4 and evaporated under reduced pressure to provide the title compound as an oil, that crystallised on standing.

1. concentrationThe mixture was concentrated under reduced pressure
2. customthe residue was partitioned between ethyl acetate and aqueous sodium carbonate solution
3. customThe layers were separated
4. dry with materialthe organic phase was dried over MgSO4
5. customevaporated under reduced pressure