反应详情

N-carbobenzoxy-L-phenylalanine (Cbz-Phe: 7.16 g, 25.4 mmol), N-t-butoxycarbonyl-ethylenediamine hydrochloride (5.00 g, 25.4 mmol), 1-hydroxybenzotriazole hydrate (HOBT: 4.28 g, 28.0 mmol), and N-methylmorpholine (NMM: 3.07 mL, 28.0 mmol) were dissolved in 100 mL of dimethylformamide (DMF), to which 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC: 5.36 g, 28.0 mmol) was then added under stirring and cooling with ice, followed by stirring at room temperature for one day. A 10% citric acid aqueous solution was added to the reaction solution, and the precipitated solid was dissolved in chloroform and a small amount of methanol, followed by washing the solution with a saturated sodium bicarbonate solution and a saturated saline solution before drying with sodium sulfate. It was concentrated under reduced pressure, followed by purifying the resultant residue using silica gel column chromatography (elution solvent: chloroform:methanol=95:5) to provide 9.69 g of the title compound as a white solid.

1. additionwas then added
2. temperaturecooling with ice
3. stirringby stirring at room temperature for one day
4. washby washing the solution with a saturated sodium bicarbonate solution
5. dry with materiala saturated saline solution before drying with sodium sulfate
6. concentrationIt was concentrated under reduced pressure
7. customby purifying the resultant residue
8. washsilica gel column chromatography (elution solvent: chloroform:methanol=95:5)