反应详情

A mixture of (3-ethoxy-4-methoxy-phenyl)-(1-methyl-1H-benzotriazol-5-yl)-methanol from above and MnO2 (2.5 g, 29 mmol) in methylene chloride (40 mL) was stirred at room temperature for 18 h. More MnO2 (1.5 g) was added and kept for overnight. The suspension was filtered thru a pad of Celite. Removal of solvent gave (3-ethoxy-4-methoxy-phenyl)-(1-methyl-1H-benzotriazol-5-yl)-methanone as an off-white solid (1.12 g, 58% yield 2 step): 1H NMR (CDCl3) δ 1.49 (t, J=7 Hz, 3H, CH3), 3.97 (s, 3H, CH3), 4.17 (q, J=7 Hz, 2H, CH2), 4.36 (s, 3H, CH3), 6.91 (d, J=8 Hz, 1H, Ar), 7.40 (dd, J=2, 8 Hz, 1H, Ar), 7.50 (d, J=2 Hz, 1H, Ar), 7.62 (d, J=8 Hz, 1H, Ar), 8.04 (dd, J=2, 9 Hz, 1H, Ar), 8.44-8.45 (m, 1H, Ar).

1. waitkept for overnight
2. filtrationThe suspension was filtered
3. customRemoval of solvent