Hydrochloric Acid → 2-Chloro-5-methoxy-2′-(trifluoromethyl)[1,1′-biphenyl]-4-carboxylic acid

Participants

Reaction Steps

To a stirred solution of 4-iodo-5-chloro-2-methoxy benzoic acid of Step A (3.12 g, 10 mmol) in N,N-dimethylformamide (100 mL) was added 2-trifluoromethyl-phenyl boronic acid (5.70 g, 30 mmol) and potassium carbonate (12.73 g, 92 mmol). This mixture was purged with nitrogen and then treated with a catalytic amount of tetrakis(triphenylphosphine) palladium(0) (0.58 g, 0.5 mmol). The reaction was heated to reflux overnight, cooled, acidified with 2N hydrochloric acid and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered, and evaporated to provide a nearly quantitative amount of the title acid which was used in the next step without further purification.

Provenance & Evidence