Potassium Carbonate → 3-[2-(2-Methoxy-phenyl)-cyclopent-1-enyl]-benzoic Acid Ethyl Ester

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Reaction Steps

A mixture of 2-methoxyphenylboronic acid (510 mg, 3.36 mmol), 3-(2-bromo-cyclopent-1-enyl)-benzoic acid ethyl ester (840 mg, 2.85 mmol), potassium carbonate (3.18 g, 23.04 mmol) and tetrakis(triphenylphosphine)palladium(0) (370 mg, 0.32 mmol) was stirred and heated in 1:1 toluene/ethanol (30 ml) at 90° C. under nitrogen for 4 hours. After cooling the mixture was diluted with diethyl ether/water and the organic phase dried (MgSO4), evaporated to dryness and the residue purified on Biotage using ethyl acetate/iso-hexane (1:19) to yield the title compound as a colourless gum. (615 mg, 67%).

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