Potassium Phosphate, Tribasic → 6-(4-(Aminomethyl)phenyl)-1-(cyclohexylmethyl)-1H-imidazo[4,5-B]pyrazin-2(3H)-one

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Reaction Steps

tert-Butyl 4-(3-(cyclohexylmethyl)-2-oxo-2,3-dihydro-1H-imidazo[4,5-b]pyrazin-5-yl)benzylcarbamate. 6-Bromo-1-(cyclohexylmethyl)-1H-imidazo[4,5-b]pyrazin-2(3H)-one (See Example 55.B) (200 mg, 0.64 mmol), [4-(N-boc-aminomethyl)phenyl]boronic acid (195 mg, 0.77 mmol), dichloro[1,1′-bis(diphenylphosphino)ferrocene]palladium (II) dichloromethane (53 mg, 0.06 mmol) and potassium phosphate (550 mg, 2.58 mmol) in DMF (15 mL) and water (1 mL) were reacted according to General Procedure B. The product was purified by reverse-phase semi-preparatory HPLC (30-100% acetonitrile+0.1% TFA in H2O+0.1% TFA, over 30 min). The desired fractions were concentrated to approximately one third the original volume and treated with potassium carbonate (1.75 M). The desired product was collected by vacuum filtration, washed with water and dried under high vacuum to provide the title compound. The product was used directly in the next step without further purification or characterization. MS (ESI) m/z 438.1 [M+1]+.

Provenance & Evidence