2-[(5-Methoxy-2-methoxymethoxybenzylidene)amino]-3-methylphenol → 2-(5-Methoxy-2-methoxymethoxyphenyl)-4-methylbenzoxazole

Participants

Reaction Steps

A solution of 2-[(5-methoxy-2-methoxymethoxybenzylidene)amino]-3-methylphenol (F4) (1.51 g, 5 mmol) and BaMnO4 (5.13 g, 20 mmol) in benzene (50 mL) was refluxed for 5 hours under dry N2 gas flowing. After the reaction mixture was cooled to room temperature, BaMnO4 was removed through Celite and the filtrate was concentrated in vacuo. The black residue was purified by silica gel column chromatography (CHCl3) to afford the objective compound as a pale yellow soild (976 mg, 65%): 1H-NMR (500 MHz, CDCl3) δ2.68 (s, 3H), 3.55 (s, 3H), 3.87 (s, 3H), 5.25 (s, 2H), 7.02 (dd, 1H, J=9.0, 3.0 Hz), 7.15 (d, 1H, J=8.0 Hz), 7.21 (d, 1H, J=9.0 Hz), 7.24 (t, 1H, J=8.0 Hz), 7.42 (d, 1H, J=8.0 Hz), 7.63 (d, 1H, J=3.0 Hz).

Provenance & Evidence