反应详情

温度

100 °C

4-Acetoxy-5-allyl-1,3-dihydro-6-methoxy-7-methyl-3-oxoisobenzofuran (0.6 g), methyl 2-bromo-3-methylbenzoate (0.92 g), silver carbonate (1.3 g), palladium acetate (0.1 g), triphenylphosphine (0.14 g) and dimethylformamide (70 ml) were heated with stirring at 100° C. for 6 hours, then stirred at ambient temperature for 18 hours. The mixture was poured into ice water and the pH adjusted to 3 by addition of 2N hydrochloric acid. The mixture was extracted with ethyl acetate, and the extract was dried and evaporated. The residue was chromatographed on silica gel, eluting with 7:3 hexane:ethyl acetate, to give methyl (E)-2-[3-(4-acetoxy-1,3-dihydro -6-methoxy-7-methyl-3-oxoisobenzofuran-5-yl)-prop -1-en-1-yl]-3-methylbenzoate, mp 104°-111° C. (ethyl acetate/hexane).

1. stirringstirred at ambient temperature for 18 hours
2. extractionThe mixture was extracted with ethyl acetate
3. customthe extract was dried
4. customevaporated
5. customThe residue was chromatographed on silica gel
6. washeluting with 7:3 hexane