反应详情

温度

-25 °C

To 1,2-dichloroethane (500 mL) were added anhydrous aluminum chloride (50.5 g) and zinc chloride (5.72 g), followed by stirring for 15 min. Under ice-cooling, a solution of 1,3-dimethoxy-5-chlorobenzene (55 g) in 1,2-dichloroethane (140 mL) was added. The mixture was cooled to −25° C. and 4-methoxyphenylacetyl chloride (53.9 mL) in 1,2-dichloroethane (250 mL) was added drop-wise. The mixture was allowed to warm to room temperature and stirred for 12 h. The mixture was cooled to 0° C., quenched with 1.0 N HCl (300 mL), and the resulting suspension was filtered through Celite and silica gel using ethyl acetate. Chromatography on silica gel (eluant: 10–40% ethyl acetate/hexane) provided the title compound (39 g). 1H NMR (DMSO-d6): 7.07 (d, 2H, J=8.77 Hz), 6.85 (d, 2H, J=8.77 Hz), 6.62 (m, 2H), 3.94 (s, 2H), 3.80 (s, 6H), 3.72 (s, 3H); MS: 321 (MH+).

1. temperatureUnder ice-cooling
2. temperatureto warm to room temperature
3. stirringstirred for 12 h
4. temperatureThe mixture was cooled to 0° C.
5. customquenched with 1.0 N HCl (300 mL)
6. filtrationthe resulting suspension was filtered through Celite and silica gel