Hydrochloric Acid → 2-Amino-3-oxo-3-phenylpropionic acid methylester

Temperatur

-78 °C

Dry tetrahydrofuran (250 ml) was cooled to −78° C. Potassium tert-butoxide (6.37 g; 56.72 mmol) was dissolved in dry tetrahydrofuran (100 ml) and added. (Benzhydrylideneamino) acetic acid methyl ester (14.35 g; 56.72 mmol) was added and the reaction mixture was stirred 30 min at −78° C. Benzoyl chloride (6.59 g; 56.72 mmol) was added dropwise and the reaction mixture was stirred 30 min at −78° C. Hydrochloric acid (1.0 M; 175 ml) was added dropwise. The reaction mixture was heated to room temperature and 2/3 of the solvent was removed in vacuo. Water (700 ml) was added and the reaction mixture was washed with diethyl ether (400 ml). The aqueous phase was evaporated in vacuo and the residue was dissolved in methanol and evaporated (2×150 ml). Methanol (80 ml) was added. The mixture was filtrated and the filtrate was evaporated in vacuo. The residue was recrystallised from tetrahydrofuran/diethyl ether to afford 8.86 g of 2-amino-3-oxo-3-phenylpropionic acid methylester as a hydrochloride.

1. additionadded
2. stirringthe reaction mixture was stirred 30 min at −78° C
3. temperatureThe reaction mixture was heated to room temperature
4. custom2/3 of the solvent was removed in vacuo
5. additionWater (700 ml) was added
6. washthe reaction mixture was washed with diethyl ether (400 ml)
7. customThe aqueous phase was evaporated in vacuo
8. dissolutionthe residue was dissolved in methanol
9. customevaporated (2×150 ml)
10. additionMethanol (80 ml) was added
11. filtrationThe mixture was filtrated
12. customthe filtrate was evaporated in vacuo
13. customThe residue was recrystallised from tetrahydrofuran/diethyl ether

ORD-Eintrag

ord-ebf9ceb1d0964200b767543c0e77c089

Quelldatensatz

uspto-grants-2002_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06350767B1