Benzyl chloroformate → HCID 20681205, Verbindung

To a stirred solution of α-methyl-D,L-glutamic acid (10 g, 62 mmol) in 2 N sodium hydroxide (62 mL) at 0-5° C. was added benzyl chloroformate (12.7 g, 74.4 mmol) over 30 min. After the addition was complete the reaction mixture was stirred at room temperature for 3 hours. During this time the pH was maintained at 11 by addition of 2N sodium hydroxide (33 mL). The reaction mixture was then extracted with ether (60 mL). The aqueous layer was cooled in an ice bath and then acidified with 4N hydrochloric acid (34 mL) to pH=1. The resulting mixture was extracted with ethyl acetate (3×100 mL). The combined ethyl acetate extracts were washed with brine (60 mL) and dried (MgSO4). The solvent was removed in vacuo to give 15.2 g (83%) of N-benzyloxycarbonyl-α-methylglutamic acid as an oil: 1H NMR (CDCl3) δ8.73(m, 5H), 5.77(b, 1H), 5.09(s, 2H), 2.45-2.27(m, 4H), 2.0(s, 3H).

1. additionAfter the addition
2. extractionThe reaction mixture was then extracted with ether (60 mL)
3. temperatureThe aqueous layer was cooled in an ice bath
4. extractionThe resulting mixture was extracted with ethyl acetate (3×100 mL)
5. washThe combined ethyl acetate extracts were washed with brine (60 mL)
6. dry with materialdried (MgSO4)
7. customThe solvent was removed in vacuo

ORD-Eintrag

ord-441a05fe477a4f28a9599c2ee8cf8885

Quelldatensatz

uspto-grants-2002_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06335349B1