Potassium Carbonate → 2-(4-Hydroxy-2-methyl-phenyl)-4-isopropyl-thiazole-5-carboxylic acid ethyl ester

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To a solution of 2-bromo-4-isopropyl-thiazole-5-carboxylic acid ethyl ester (834 mg, 3 mmol), 3-methyl-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenol (1.4 g, 6 mmol) and K2CO3 (828 mg, 6 mmol) in 1,4-dioxane/H2O (30 mL/5 mL) is bubbled nitrogen gas for 10 minutes. To this solution is added tetrakistriphenylphosphine palladium (173 mg, 0.15 mmol). The reaction mixture is stirred at 100° C. overnight. The reaction mixture is concentrated under reduced pressure and the residue is partitioned between EtOAc and 1N HCl. The organic phase is concentrated and purified by column chromatography (gradient: 0 to 15% EtOAc in hexanes) to give the title product (730 mg, 80%). 1H NMR (DMSO-d6) δ 9.99 (s, 1H), 7.68 (d, 1H), 6.68, 6.72 (m, 2H), 4.26 (q, 2H), 3.88 (m, 1H), 2.50 (s, 3H), 1.26 (t, 3H), 1.23 (d, 6H).

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