Sodium Carbonate → 5-Bromo-2-cyclohexenylpyridin-3-amine

Participants

Reaction Conditions

Reaction Steps

A stirred mixture of 2,5-dibromopyridin-3-amine (0.2135 g, 0.848 mmol), 1-cyclohexen-1-yl-boronic acid pinacol ester (0.30 mL, 1.40 mmol), tetrakis(triphenylphosphine)palladium (0.098 g, 0.084 mmol), and 2.0M sodium carbonate (2.0 mL, 4.00 mmol) in toluene (1.5 mL) and ethanol (0.5 mL) was heated to 90° C. After 2.5 h, the reaction was cooled to rt then diluted with water. After extraction with EtOAc, the organic extraction was dried over anhydrous sodium sulfate. After filtration and concentration, the residue was purified on silica gel (0-35% EtOAc in hexanes) to afford a white solid as 5-bromo-2-cyclohexenylpyridin-3-amine. 1H NMR (400 MHz, CDCl3) δ ppm 8.01 (1H, d, J=2.0 Hz), 7.10 (1H, d, J=2.3 Hz), 6.00 (1H, tt, J=3.7, 2.0 Hz), 3.96 (2H, br. s.), 2.45 (2H, m), 2.26 (2H, m), 1.87 (4H, m). 2,5-Dicyclohexenylpyridin-3-amine was also isolated. 1H NMR (400 MHz, CDCl3) δ ppm 8.07 (1H, d, J=2.0 Hz), 6.95 (1H, d, J=2.0 Hz), 6.16 (1H, m), 6.05 (1H, m), 3.81 (2H, br. s.), 2.48 (4H, m), 2.27 (4H, m), 1.87 (8H, m).

Provenance & Evidence