Ammonium Hydroxide → (S)-tert-butyl 2-amino-2-oxo-1-phenylethylcarbamate

Temperature

0 °C

To a solution of (S)-2-(tert-butoxycarbonylamino)-2-phenylacetic acid (1.00 g, 3.98 mmol) in DMF (5 mL) and was added ammonium hydroxide (2.0 mL, excess), and HOBt (645 mg, 4.78 mmol) and the resulting solution stirred at 0° C. for 10 minutes. EDCI (916 mg, 4.78 mmol) was added and the reaction stirred at 25° C. for 18 hours. The mixture was concentrated in vacuo, the resulting residue was diluted with ethyl acetate (45 mL), brine (10 mL), and 5% H3PO4 aqueous solution (10 mL), and the layers were separated. The organic layer was washed with 5% H3PO4 aqueous solution (10 mL), twice with saturated aqueous sodium bicarbonate solution (15 mL), water (15 mL), and brine (15 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to afford the title compound as a light colored solid. The crude material was taken on directly to the next step. (0.990 g, 99% yield) MS (ESI+) m/z=251 (M+H)+.

1. stirringthe reaction stirred at 25° C. for 18 hours
2. concentrationThe mixture was concentrated in vacuo
3. additionthe resulting residue was diluted with ethyl acetate (45 mL), brine (10 mL), and 5% H3PO4 aqueous solution (10 mL)
4. customthe layers were separated
5. washThe organic layer was washed with 5% H3PO4 aqueous solution (10 mL), twice with saturated aqueous sodium bicarbonate solution (15 mL), water (15 mL), and brine (15 mL)
6. dry with materialThe organic layer was dried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo

ORD record

ord-aedd3a2258334162bc554fd9a37c3abd

Source dataset

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08497275B2