反应详情

A solution of (3S)-1,3-bis(tert-butoxycarbonylamino)-2-pyrrolidone (3.15 g) in methanol (10 ml) was combined with a 4N solution of hydrochloric acid in ethyl acetate (20 ml) and stirred at room temperature for 30 minutes. The reaction mixture was concentrated, and the resultant residue was combined with dichloromethane (30 ml) and triethylamine (6.06 g), and then with di-tert-butyl dicarbonate (2.62 g) at 0° C. and stirred at room temperature for 1 hour. The reaction mixture was combined with an aqueous solution of sodium carbonate, extracted with dichloromethane, dried and concentrated. The residue obtained was washed with hexane to obtain (3S)-1-amino-3-(tert-butoxycarbonylamino)-2-pyrrolidone (1.89 g) as a colorless solid.

1. concentrationThe reaction mixture was concentrated
2. stirringwith di-tert-butyl dicarbonate (2.62 g) at 0° C. and stirred at room temperature for 1 hour
3. extractionextracted with dichloromethane
4. customdried
5. concentrationconcentrated
6. customThe residue obtained
7. washwas washed with hexane