Potassium Carbonate → Ethyl 2-(6-chloropyridin-3-yl)-4-methyl-1,3-thiazole-5-carboxylate

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Reaction Steps

Ethyl 2-bromo-4-methyl-1,3-thiazole-5-carboxylate (1 g, 1.3 eq, 4 mmol) is added to a mixture of 2-chloro-5-pyridine boronic acid (0.48 g, 1 eq, 3.07 mmol), tetrakis(triphenylphosphine)palladium (0.18 g, 0.05 eq, 0.15 mmol) and an aqueous solution of 2 M potassium carbonate (3 ml, 2 eq, 6.14 mmol) in toluene/ethanol (18 ml, 2:1 v/v). The mixture is refluxed overnight and the solvent is evaporated, then taken up in ethyl acetate, and washed two times with an aqueous solution of sodium hydrogenocarbonate. The organic layer is dried over magnesium sulfate, filtered and concentrated under vacuum. Purification by chromatography over silicagel (eluent: dichloromethane 100%) affords 0.6 g of ethyl 2-(6-chloropyridin-3-yl)-4-methyl-1,3-thiazole-5-carboxylate i97.

Provenance & Evidence