Butane → 4-(4-Phenoxy-quinazolin-6-yl)benzaldehyde

Participants

Reaction Steps

To a solution of toluene (211 mL) in a 1.0 L round-bottom flask equipped with a reflux condenser was added 1,4-bis(diphenyl)phosphino)-butane (1.22 g, 2.87 mmol) and bis(benzonitrile)dichloro-palladium (1.1 g, 2.87 mmol). The resulting solution was stirred at room temperature for 30 minutes followed by the addition of THF (tetrahydrofuran) (255 mL) and EtOH (115 mL). To the resulting mixture was added 6-iodo-4-phenoxy-quinazoline 14 (5.0 g, 14.4 mmol), 4-formylphenylboronic acid (4.3 g, 28.7 mmol) and aqueous 1M Na2CO3 (29 mL). The mixture was heated at reflux under an atmosphere of N2 for 18 hours. The reaction mixture was filtered hot and the solvent removed under reduced pressure. The residue was taken up in CHCl3 and washed with water, brine, and dried (MgSO4). The solvent was removed under reduced pressure and the residue was purified using flash chromatography (silica gel, EtOAc/hexanes 4:6) to provide (4.42 g, 13.54 mmol) 4-(4-phenoxy-quinazolin-6-yl)benzaldehyde 15 in 94% yield. 1H NMR (CDCl3 ) δ7.26 (m, 3H), 2.88 (m, 1H), 7.51 (M, 2H), 7.92 (d, 2H, J=8.4 Hz), 8.02 (d, 2H, J=8 Hz), 8.11 (d, 1H, J=8.8 Hz), 8.20 (dd, 1H, J=2.4 and 8.8 Hz), 8.63 (d, 1H, J=2.4 Hz), 8.79 (s, 1H); MS (Cl) m/e 326 (M++1, 100).

Provenance & Evidence