The treatment of 2,4,6-trihydroxy-2′,4′,5′-trimethoxydeoxybenzoin with benzyl chloride gave a dibenzyl ether. The condensation of the ether with ethyl formate, followed by the debenzylation of the resulting isoflavone, afforded 5,7-dihydroxy-2′,4′,5′-trimethoxyisoflavone, which was then converted into a pentamethoxyisoflavone. The partial demethylation of the pentamethoxyisoflavone gave 5-hydroxy-2′,4′,5′,7-tetramethoxyisoflavone, which was identical with natural robustigenin.
将2,4,6-三羟基-2′,4′,5′-
三甲氧基去氧苯偶姻与苄
氯反应得到了
二苄醚。将该醚与
乙酸乙酯缩合,随后对生成的异
黄酮进行脱苄基反应,得到了5,7-二羟基-2′,4′,5′-
三甲氧基异
黄酮,然后将其转化为五甲氧基异
黄酮。部分脱甲基化的五甲氧基异
黄酮得到了5-羟基-2′,4′,5′,7-四甲氧基异
黄酮,该化合物与天然的
高良姜素相同。