Boc-L-Valine → {(S)-1-[4-fluoro-2-(pyridin-3-ylamino)phenylcarbamoyl]-2-methylpropyl}carbamic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-fluoro-N2-pyridin-3-ylbenzene-1,2-diamine (685 mg, 3.0 mmol) in DCM (18 mL) at 0° C. were added (S)-2-tertbutoxycarbonylamino-3-methylbutyric acid (720 mg, 3.3 mmol), HOAt (0.450 g, 3.3 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (0.63 g, 3.3 mmol) and the resulting mixture stirred at 0° C. for 2 h. The reaction mixture was partitioned between DCM and a saturated aqueous solution of NaHCO3. The organic layer was dried (MgSO4), concentrated in vacuo and the resulting residue purified by column chromatography (Si—PCC, gradient 0-60% EtOAc in cyclohexane) to afford {(S)-1-[4-fluoro-2-(pyridin-3-ylamino)phenylcarbamoyl]-2-methylpropyl}carbamic acid tert-butyl ester (790 mg). LCMS (Method J): RT 2.10 min [M+H]+ 403.3

Provenance & Evidence