Tert-butoxycarbonylalanine → [(S)-1-(3-Bromo-2-cyclopropylamino-4-fluorophenylcarbamoyl)ethyl]carbamic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-bromo-N2-cyclopropyl-4-fluorobenzene-1,2-diamine (759 mg, 3.10 mmol), (S)-2-tertbutoxycarbonylaminopropionic acid (644 mg, 3.41 mmol), HOAt (464 mg, 3.41 mmol) and N-(3-dimethylaminopropyl)-N-ethylcarbodiimide hydrochloride (654 mg, 3.41 mmol) in DCM (20 mL) was stirred at 0° C. for 1 h. The reaction mixture was then partitioned between DCM and a saturated solution of NaHCO3. The organic fraction was dried and concentrated in vacuo. The resulting residue was purified by column chromatography (Si—PCC, gradient 0-50% EtOAc in cyclohexane) to afford the title compound (1.05 g, 81%) as a pale beige solid. LCMS (Method C): RT 3.66 min [M+H]+ 416.05

Provenance & Evidence