Potassium Phosphate, Dibasic → 5-(4-Methoxy-phenyl)-benzofuran-7-carbaldehyde

Participants

Reaction Steps

To a solution of 5-(4-methoxyphenyl)-7-methyl-benzofuran (1.60 g, 2.83 g 1:1 ratio with 4-methoxy-biphenyl 6.72 mmol) in carbon tetrachloride (190 ml) was added NBS (1.32 g, 7.40 mmol) and AIBN (50 mg). The solution was brought to reflux for 2 h, cooled to room temperature, and the solids were filtered off. The solution was then concentrated and anhydrous CH3CN (80 ml) was added. Then potassium benzeneselenite (2.14 g, 9.41 mmol), and K2HPO4 (1.17 g, 6.72 mmol) were added and then reaction was heated to reflux for 1 h after which it was allowed to cool to room temperature. The solution was then passed through a silica plug and concentrated under high vacuum. Chromatography (100% CH2Cl2) afforded 850 mg (50%) product as a white solid: mp 94–95° C.; 1H NMR (300 MHz, DMSO-d6): δ 3.82 (3H, s), 7.08 (2H, d, J=8.8 Hz), 7.14 (1H, d, J=2.2 Hz), 7.71 (2H, d, J=8.8 Hz), 8.10 (1H, d, J=1.9 Hz), 8.21 (1H, d, J=2.2 Hz), 8.25 (1H, d, J=1.9 Hz), 10.37 (1H, s); MS (ESI) m/z 253 ([M+H]+).

Provenance & Evidence