Hydrochloric Acid → (R)-4-(1-Cyano-4-hydroxy-7-phenoxyisoquinoline-3-carboxamido)-2-(3-ethylureido)butanoic acid

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Reaction Conditions

Reaction Steps

(R)-2-Amino-4-(1-cyano-4-hydroxy-7-phenoxyisoquinoline-3-carboxamido)butanoic acid (15 mg, 0.03 mmol) in CH2Cl2 (1 mL) was cooled to 0° C. To the solution were added triethylamine (0.03 mL, 0.21 mmol) and ethyl isocyanate (5 μL, 0.06 mmol). After stirring for 40 minutes at 0° C., H2O (10 mL) and EtOAc (10 mL) were added. To the stirred mixture was added 1 N hydrochloric acid (1 mL). The layers were separated and the aqueous layer was extracted twice with EtOAc. The combined organic layers were dried over MgSO4, concentrated, and purified by flash chromatography (0-20% MeOH/CH2Cl2 with 0.5% formic acid) to give the title compound in 13 mg. MS: (−) m/z 476.25 (M−1).

Provenance & Evidence