diethyl 1H-pyrazole-3,5-dicarboxylate → HCID 69069671, compound

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A mixture of diethyl-3,5-pyrazoledicarboxylate (1.0 g, 4.71 mmol), 3-bromophenylboronicacid (1.89 g, 9.42 mmol) and di-Micron-hydroxo-bis[(N,N,N′,N′-tetramethylethylenediamine)copper(II)]chloride (0.21 g, 0.47 mmol) in dichloromethane (22 mL) was stirred under air for 36 hours under air. It was filtered over a short silica gel pad, concentrated and purified by column chromatography (hexanes:ethyl acetate; 90:10) to yield 1.45 g (85%) of the product as a white solid.

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