Novel 3-alkyl-3′,4′,5,7-tetrahydroxyflavones have been prepared. The synthetic strategy involves the preparation of 1-(2-hydroxy-4,6-dimethoxyphenyl)alkan-1-ones from the Friedel–Crafts acylation of phloroglucinol followed by methylation. These key compounds were submitted to the three-step Baker–Venkataraman method, giving the 3-alkyl-3′,4′,5,7-tetramethoxyflavones, which were demethylated with boron tribromide.
新型 3-烷基-3′,4′,5,7-四羟基黄酮被制备出来。其合成策略是通过氯代葡萄糖醇的弗里德尔-卡夫斯酰化反应制备 1-(2-羟基-4,6-二甲氧基苯基)烷-1-酮,然后进行甲基化反应。这些关键化合物采用三步贝克-文卡塔拉曼法,得到了 3-烷基-3′,4′,5,7-四甲氧基黄酮,并用三溴化硼进行了脱甲基处理。