Ethyl Acrylate → 3-(Benzofuran-6-yl)-acrylic acid ethyl ester

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A mixture of the 6-bromo-benzofuran 6-3 (1.74 g, 8.79 mmol), ethyl acrylate (1.09 g, 10.98 mmol), Pd(OAc)2 (0.099 g, 0.44 mmol), tri-o-tolylphosphine (0.268 g, 0.880 mmol), and sodium acetate (3.60 g, 43.9 mmol) in DMF (10 mL) was heated to 100° C. in a sealed tube for 4 h. The mixture was cooled to room temperature, diluted with water, and extracted with Et2O (2×40 mL). The combined organic extracts were washed with brine (30 mL), dried over MgSO4, filtered, and concentrated. The residue was purified by flash chromatography (10% ethyl acetate/hexanes) to give the ester 6-4 as an off-white solid.

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