反应详情

Commercially available L-cyclopropyl glycine (500.8 mg, 4.35 mmol) was dissolved in CH3CN (30 mL), H2O (4 mL), and MeOH (4 mL). Carbonic acid 4-nitro-phenyl ester 2,2,2-trifluoro-1,1-dimethyl-ethyl ester (1.91 g, 6.52 mmol) was added followed by DIPEA (1.89 mL, 10.9 mmol). The reaction was allowed to stir at room temperature for three days. The reaction was acidified and extracted with EtOAc (3×50 mL). The organic layer was mixed with saturated NaHCO3 solution (100 mL) and the layers were separated. The aqueous layer was extracted with EtOAc (30 mL) and the organic was discarded. The aqueous layer was acidified with HCl (1N) and extracted with EtOAc (3×50 mL). The organic layer was washed with brine (30 mL), dried over Na2SO4, and concentrated to produce cyclopropyl-(2,2,2-trifluoro-1,1-dimethyl-ethoxycarbonylamino)-acetic acid (797.6 mg, 68%). LCMS found 267.7 [M−H]−.

1. extractionextracted with EtOAc (3×50 mL)
2. additionThe organic layer was mixed with saturated NaHCO3 solution (100 mL)
3. customthe layers were separated
4. extractionThe aqueous layer was extracted with EtOAc (30 mL)
5. extractionextracted with EtOAc (3×50 mL)
6. washThe organic layer was washed with brine (30 mL)
7. dry with materialdried over Na2SO4
8. concentrationconcentrated