Synthetic Studies on the Flavone Derivatives. XII. Synthesis of 2', 3', 5'-and 3', 4', 5'-Trioxygenated Flavones

抄録

Two unusual flavones, 5, 5'-dihydroxy-2', 3', 6', 7-tetramethoxyflavone (1) from Gardenia cramerii and 4', 5-dihydroxy-3', 5', 6, 7-tetramethoxyflavone (6) from Artemisia mesatlantia, and their position isomers were synthesized to investigate the structural correlation in terms of spectral data. The structure of the flavone from G. cramerii is discussed.