Potassium Carbonate → 7-Hydroxy-2,4-diphenyl-thiazolo[4,5-c]pyridine-6-carboxylic acid ethyl ester

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A mixture of 4-bromo-7-hydroxy-2-phenyl-thiazolo[4,5-c]pyridine-6-carboxylic acid ethyl ester (81 mg, 0.21 mmol), phenylboronic acid (34 mg, 0.28 mmol), tetrakis(triphenylphosphine)palladium(0)(25 mg, 0.02 mmol) and potassium carbonate (89 mg, 0.64 mmol) in dioxane (3 mL) and water (12 μL) was refluxed for 22 h before it was cooled to room temperature and partitioned between ethyl acetate and water. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel with a gradient of ethyl acetate and dichloromethane to give the title compound as a white solid (29 mg): 1H NMR (CDCl3, 200 MHz): δ=11.46 (s, 1H), 8.49 (m, 2H), 8.14 (m, 2H), 7.53 (m, 6H), 4.56 (q, J=7.0 Hz, 2H), 1.54 (t, J=7.0 Hz, 3H).

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