Potassium Carbonate → (S,E)-2-(2,6-dichlorobenzamido)-5-[4-(methyl-pyrimidin-2-ylamino)phenyl]pent-4-enoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

Under an argon atmosphere, palladium acetate (93.2 mg) and tris(2-methylphenyl)phosphine (121.2 mg) were added to a suspension of (S)-2-(2,6-dichlorobenzamido)pent-4-enoic acid methyl ester (1.20 g), N-(4-iodophenyl)-N-methylpyrimidin-2-amine (1.24 g) and potassium carbonate (824 mg) in DMF (20 ml), and the resulting mixture was stirred at 80° C. for 3 hours. After cooling the reaction solution to room temperature, ethyl acetate was added thereto, and the resulting mixture was washed twice with water and once with saturated brine, followed by drying the organic layer over anhydrous sodium sulfate. After removing anhydrous sodium sulfate by filtration, the filtrate was concentrated. The residue was purified by column chromatography (silica gel, eluent: cyclohexane/chloroform=1/1→chloroform). The obtained crude product was purified again by column chromatography (silica gel, eluent: cyclohexane/ethyl acetate=4/1→2/1) to obtain (S,E)-2-(2,6-dichlorobenzamido)-5-[4-(methyl-pyrimidin-2-ylamino)phenyl]pent-4-enoic acid methyl ester (1.28 g).

Provenance & Evidence