(3-Methoxyphenyl)boronic acid → 1-(2,6-Difluorobenzyl)-2,6-dimethyl-3-(3-methoxyphenyl)-5-formyl-4-pyridone

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Reaction Steps

1-(2,6-Difluorobenzyl)-2,6-dimethyl-3-bromo-5-formyl-pyrid-4-one (1.36 g, 3.8 mmol) stirred with 3-methoxyphenyl boronic acid (696 mg, 4.6 mmol) and tetrakis(triphenylphosphine)palladium(0) (439 mg, 380 μmol) in benzene/ethanol/DME (76 ml, 10/1/11) and barium hydroxide (30 mL, sat., aq.) under N2 at 90° C., protected from light over 8 hours. The organic layer was then concentrated and purified using flash silica chromatography (ethyl acetate/hexane-1/9), giving the product as a cream-colored solid (622 mg, 1.6 mmol, 42% yield). 1H NMR (CDCl3, 300 MHz) δ 10.55 (s, 1H), 7.41-7.31 (m, 2H), 7.00-6.74 (m, 5H), 5.35 (s, 2H), 3.81 (s, 3H), 2.79 (s, 3H), 2.25 (s, 3H); MS: 384 (MH+).

Provenance & Evidence