反应详情

Aluminum chloride (2.15 g, 16.12 mmol) was added to a stirred mixture of 1,2-dimethoxybenzene (2.03 g, 14.65 mmol) in anhydrous methylene chloride (20 ml) in an ice bath. Then a solution of 4-methoxybenzoyl chloride (2.50 g, 14.65 mmol) in anhydrous methylene chloride (50 ml) was added. The mixture was allowed to warm up to rt. then refluxed overnight. After cooling down to rt, the mixture was poured to ice water (50 ml), stirred for 20 min., and extracted with methylene chloride (3×50 ml). The combined organic extracts were washed with sat. NaHCO3 (3×50 ml), H2O (2×50 ml), brine (50 ml), dried over MgSO4, filtered and concentrated in vacuo to an oil, which was purified via flash column chromatography (10% EtOAc in hexane) to give (3,4-dimethoxy-phenyl)-(4-methoxy-phenyl)methanone as an off-white solid (3.66 g, 92%); 1HNMR (CDCl3) δ 7.80 (d, J=8 Hz, 2H, Ar), 7.44 (d, J=1 Hz, 12H, Ar), 7.37 (dd, J=1 Hz and 8 Hz, 1H, Ar), 6.97 (d, J=8 Hz, 2H, Ar), 6.90 (d, J=8 Hz, 1H), 3.96 (s, 3H, OCH3), 3.94 (s, 3H, OCH3), 3.89 (s, 3H, OCH3). The product was carried over to the next step.

1. temperaturethen refluxed overnight
2. temperatureAfter cooling down to rt
3. extractionextracted with methylene chloride (3×50 ml)
4. washThe combined organic extracts were washed with sat. NaHCO3 (3×50 ml), H2O (2×50 ml), brine (50 ml)
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo to an oil, which
8. customwas purified via flash column chromatography (10% EtOAc in hexane)