Hydrochloric Acid → 5-Chloro-4-(3-chlorophenyl)-pyridine-2-carboxylic acid

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To a solution of 5-chloro-4-iodo-pyridine-2-carboxylic acid (CAN 120643-06-3, 500 mg, 1.76 mmol) in toluene (10 mL) was added with stirring the [1,1-bis(diphenylphosphino)ferrocene]dichloropalladium DCM complex (144 mg, 0.176 mmol), B-(3-chlorophenyl)-boronic acid (552 mg, 3.53 mmol) and sodium carbonate (467 mg, 4.41 mmol) in water (3 mL). The resulting mixture was stirred at 80° C. for 23 h, cooled, poured onto ice/water, acidified with hydrochloric acid (15 mL, 1 N) and partitioned between water and ethyl acetate. The organic portion was washed with brine, combined, dried over Na2SO4, filtered and concentrated. The crude product precipitated as brown solid from the concentrated solution and was used without further purification in the next step. MS (ESI, m/z): 268.1 (M).

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