1,1'-Carbonyldiimidazole → (R)-3-(5-Cyano-2-oxo-1,2-dihydro-imidazo[4,5-b]pyridin-3-yl)-3-phenyl-propionic acid ethyl ester

Participants

Reaction Steps

To a stirred solution of (R)-3-(3-amino-6-cyano-pyridin-2-ylamino)-3-phenyl-propionic acid ethyl ester (600 mg, 1.93 mmol) in THF (20 ml) was added CDI (630 mg, 3.87 mmol) and DBU (0.12 ml, 0.77 mmol). The resulting solution was stirred at room temperature for 18 hours after which time the reaction appeared complete. Added silica gel and concentrated. The remaining solid was purified via silica gel flash column chromatography (Companion, 12 g silica gel, 30-60% EtOAc/hexanes) to give 120 mg (19%) of the title compound.

Provenance & Evidence