Triethylamine → [(S)-1-(2-Chloro-6-phenylaminophenylcarbamoyl)ethyl]carbamic acid tertbutyl ester

Participants

Reaction Conditions

Reaction Steps

To a mixture of 3-chloro-N1-phenylbenzene-1,2-diamine (1.72 g, 7.87 mmol), (S)-2-tertbutoxycarbonylaminopropionic acid (1.64 g, 8.65 mmol), HOAt (1.18 g, 8.65 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (1.66 g, 8.65 mmol) in DCM (40 mL) cooled to 0° C. under a nitrogen atmosphere was added Et3N (3.3 mL, 0.0236 mol). The reaction mixture was stirred at 0° C. for 5 min, then slowly warmed to RT and stirring was continued for 16 h. The resulting mixture was partitioned between DCM and a saturated solution of NaHCO3. The organic layer was washed with brine, then dried (Na2SO4) and concentrated in vacuo. The residue thus obtained was purified column chromatography (Si—PCC, gradient 0-2% 2M NH3/MeOH in DCM) affording [(S)-1-(2-Chloro-6-phenylaminophenylcarbamoyl)ethyl]carbamic acid tertbutyl ester as an off-white solid (1.60 g, 52% over three steps). LCMS: RT 3.75 min [M+H]+ 390.2.

Provenance & Evidence