Acetone → 4-Benzyloxy-2-(4-bromo-2-fluoro-benzoylamino)-butyric acid

Participants

Reaction Conditions

Reaction Steps

To a stirring solution of 2-amino-4-benzyloxy-butyric acid hydrochloride salt (1.0 mmol) (See Intermediate 34) and sodium carbonate (3.0 mmol) in 1:1 acetone/water (0.5M) in a 0° C. ice bath, slowly add 4-bromo-2-fluoro-benzoyl chloride (1.2 mmol) diluted in acetone (prepared from 4-bromo-2-fluoro-benzoic acid (1.0 mmol) and oxalyl chloride (1.0 mmol) in dichloromethane using catalytic dimethylformamide). Stir for 30 minutes at 0° C. After this time, wash the reaction with 1N hydrochloric acid while extracting with ethyl acetate. Concentrate the organics in vacuo. Purify on an Isco CombiFlash® chromatography system eluting with 1% acetic acid in ethyl acetate and hexane. MS (m/e) (79Br/81Br): 410.3/412.3 (M+1)

Provenance & Evidence