反应详情

In DMF (50.0 ml), 5-t-butoxycarbonylamino-(2S)-(9H-fluoren-9-ylmethoxycarbonylamino)-pentanoic acid (2.50 g) was dissolved. The solution was added with WSCI hydrochloride (1.21 g) and HOBt (0.84 g) and the whole was stirred at room temperature for 1.5 hours. The solution was added with ethanol (1.0 ml) and the whole was stirred at room temperature for additional 17 hours. After completion of the reaction, the solvent was distilled off. The residue was dissolved in chloroform and washed with a 1 mol/l sodium hydroxide aqueous solution, followed by extraction with chloroform. The organic layer was washed with a saturated saline solution and dried with anhydrous sodium sulfate. After filtration, the solvent was distilled off. The residue was purified through silica gel column chromatography (hexane/ethyl acetate), thereby obtaining the subject compound (1.22 g) as a white solid.

1. stirringthe whole was stirred at room temperature for additional 17 hours
2. customAfter completion of the reaction
3. distillationthe solvent was distilled off
4. dissolutionThe residue was dissolved in chloroform
5. washwashed with a 1 mol/l sodium hydroxide aqueous solution
6. extractionfollowed by extraction with chloroform
7. washThe organic layer was washed with a saturated saline solution
8. dry with materialdried with anhydrous sodium sulfate
9. filtrationAfter filtration
10. distillationthe solvent was distilled off
11. customThe residue was purified through silica gel column chromatography (hexane/ethyl acetate)