反应详情

A mixture of 0.194 g (2.6 mmol) of 6-bromo-1-(3,4-dimethoxy-2,5,6-trimethylphenyl)-1-hexanone, 0.55 g (2.6 mmol) of 2,4-dihydroxy-3-propylbenzoic acid methyl ester and 1.10 g (7.8 mmol) of potassium carbonate in 20 mL of acetone and 2 mL of DMF was stirred at reflux for 17 hours. After workup as in Example 16, the crude product was purified by chromatography on 100 g of silica gel. Elution with 10% ethyl acetate-hexane gave 1.05 g (83% yield) of 4-[[6-(3,4-dimethoxy-2,5,6-trimethylphenyl)-6-oxohexyl]oxy]-2-hydroxy-3-propylbenzoic acid methyl ester. The nmr spectrum was consistent with the structure and the mass spectrum gave the molecular ion at m/z 486 (C28H28O7).

1. temperatureat reflux for 17 hours
2. customAfter workup as in Example 16, the crude product was purified by chromatography on 100 g of silica gel
3. washElution with 10% ethyl acetate-hexane