Potassium Carbonate → 6-Cyclohexenyl-pyridine-2-carboxylic acid

Participants

Reaction Steps

Under an atmosphere of nitrogen, a solution of 6-bromo-pyridine-2-carboxylic acid (CAN 1190-87-4, 3 g, 6.4 mol), cyclohexenylboronic acid (CAN 21190-87-4, 0.89 g, 7.1 mmol), 1,1′-bis(diphenyl-phosphino)ferrocene-palladium(II)dichloride methylene chloride complex (CAN 95464-05-4, 8 mg, 0.13 mmol), potassium carbonate (1.78 g, 12.9 mmol) in H2O (30 mL) was heated to 100° C. overnight. The reaction mixture was extracted with ethyl acetate (50 mL). The pH of the aqueous layer was adjusted to 5 by addition of 1 N hydrochloric acid and the resulting mixture was extracted with ethyl acetate (3×50 mL). The combined organic extracts were washed with water and brine, dried over anhydrous sodium sulfate and evaporated. The residue was purified by prep-HPLC to yield the title compound (0.8 g, 3.94 mmol, 61.2%) as yellow oil; MS (EI): m/e=204.2 [M+H]+.

Provenance & Evidence