反应详情

Benzyl chloroformate (885 μL, 6.30 mmol) was gradually added dropwise to trans-4-aminocyclohexanecarboxylic acid (600 mg, 4.20 mmol) and sodium carbonate (891 mg, 8.40 mmol) in water (12 mL) under cooling with ice, and the reaction mixture was stirred for one day. After addition of 1 M aqueous sodium hydroxide and ethyl acetate, the insoluble solid was collected by filtration to give a colorless solid. The solid was dissolved in chloroform (10 mL) and stirred with N,O-dimethylhydroxylamine hydrochloride (416 mg, 4.27 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (819 mg, 4.27 mmol), 1-hydroxybenzotriazole (577 mg, 4.27 mmol) and triethylamine (892 μL, 6.40 mmol) at room temperature for one day. After addition of water and saturated aqueous sodium chloride, the reaction mixture was extracted with chloroform, and the organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate=2/1 (v/v)) to give the title compound as a colorless solid (350 mg, yield 26%).

1. temperatureunder cooling with ice
2. filtrationthe insoluble solid was collected by filtration
3. customto give a colorless solid
4. extractionthe reaction mixture was extracted with chloroform
5. dry with materialthe organic layer was dried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate=2/1 (v/v))