反应详情

Pyridinium chlorochromate (2.6 g, 12.2 mmol) and Celite (1 g) was added to a stirred solution of (4-methoxy-3-nitro-phenyl)-(3,4-dimethoxy-phenyl)-methanol (2.6 g, 8.1 mmol) in CH2Cl2 (100 mL). The mixture was stirred for 4 h at room temperature then filtered through Celite. The filtrate was washed with water (2×40 mL), brine (40 mL) and dried (MgSO4). Solvent was removed and the residue was purified by flash chromatography (silica gel, CH2Cl2:EtOAc 95:5) to give (4-methoxy-3-nitro-phenyl)-(3,4-dimethoxy-phenyl)-methanone (2.0 g, 76%): 1H NMR (CDCl3) δ 8.29 (d, J=2 Hz, 1H), 8.07-8.03 (dd, J=2, 8 Hz, 1H), 7.34 (d, J=1 Hz, 1H), 7.35-7.26 (dd, J=2, 8 Hz, 1H), 7.21 (d, J=8 Hz, 1H), 6.94 (d, J=8 Hz, 1H), 4.06 (s, 3H), 3.98 (s, 3H), 3.95 (s, 3H); 13C NMR (CDCl3) δ 192.10, 155.48, 153.34, 149.29, 139.01, 135.57, 130.35, 129.49, 127.60, 124.94, 113.14, 111.98, 109.96, 56.86, 56.13, 56.07.

1. filtrationthen filtered through Celite
2. washThe filtrate was washed with water (2×40 mL), brine (40 mL)
3. dry with materialdried (MgSO4)
4. customSolvent was removed
5. customthe residue was purified by flash chromatography (silica gel, CH2Cl2:EtOAc 95:5)