4-Methylmorpholine → [(1S,2R)-2-benzyloxy-1-(4-fluoro-2-phenylaminophenylcarbamoyl)propyl]carbamic acid tert-butyl ester

Participants

Reaction Steps

A mixture of 4-fluoro-N2-phenylbenzene-1,2-diamine (525 mg, 2.6 mmol), (2S,3R)-3-benzyloxy-2-tertbutoxycarbonylaminobutyric acid (880 mg, 2.9 mmol), HOAt (390 mg, 2.9 mmol), 4-methylmorpholine (0.60 mL, 5.7 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (560 mg, 2.9 mmol) in DCM (13 mL) was stirred at RT for 18 h. The reaction mixture was partitioned between DCM and a saturated aqueous solution of NaHCO3. The organic phase was washed with brine, dried (MgSO4), concentrated in vacuo and the resulting residue purified by column chromatography (Si—PCC, gradient 0-30% EtOAc in cyclohexane) to afford [(1S,2R)-2-benzyloxy-1-(4-fluoro-2-phenylaminophenylcarbamoyl)propyl]carbamic acid tert-butyl ester (1.32 g). LCMS (Method B): RT 4.32 min [M+H]+ 494.3.

Provenance & Evidence