Studies of the Selective<i>O</i>-Alkylation and Dealkylation of Flavonoids. V. The Synthesis of 5,6-Dihydroxy-3,4′,8-trimethoxyflavone and a Revised Structure for the Flavone from<i>Conyza stricta</i>
作者:Tokunaru Horie、Hiroki Kourai、Hideaki Osaka、Mitsuru Nakayama
DOI:10.1246/bcsj.55.2933
日期:1982.9
5,6-Dihydroxy-3,4′,8-trimethoxyflavone, which was the proposed structure of the pigment occuring in Conyza stricta, was synthesized from 2,3,5,6-tetramethoxyacetophenone in six steps. The natural pigment was identical not with the synthesized flavone, but with 5,7-dihydroxy-3,4′,8-trimethoxyflavone, an isomer of the former.
5,6-二羟基-3,4',8-三甲氧基黄酮是在严格锥虫中所提出的色素结构,由 2,3,5,6-四甲氧基苯乙酮分六步合成。天然色素不是与合成黄酮相同,而是与 5,7-二羟基-3,4',8-三甲氧基黄酮(前者的异构体)相同。