Phenol → 4-Methyl-3-(2-oxo-3-phenoxy-1(2H)-pyrazinyl)-benzoic acid, methyl ester

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A mixture of 3-(3,5-dibromo-2-oxo-2H-pyrazin-1-yl)-4-methyl-benzoic acid, methyl ester (Example 1b, 400 mg), phenol (400 mg), N,N-diisopropylethylamine (0.4 mL) and tetrahydrofuran (2 mL) was heated within a microwave for 3 h at 120° C. before being cooled to room temperature. The mixture was transferred to a mixture of palladium on carbon (10%, 38 mg) and tetrahydrofuran (1 mL). 1,4-Cyclohexadiene (2 mL) was added and the mixture was heated under atmosphere of nitrogen within a microwave for 15 minutes at 90° C. before being cooled to room temperature. The mixture was filtered and concentrated to give a crude product that was used in the next step without purification.

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