Flavonoids synthesis. I. Synthesis and spectroscopic properties of flavones with two hydroxy and five methoxy groups at C-2',3',4',5,6,6',7 and C-2',3,4',5,5',6,7.
作者:MUNEKAZU IINUMA、YOSHINOBU MATOBA、TOSHIYUKI TANAKA、MIZUO MIZUNO
DOI:10.1248/cpb.34.1656
日期:——
Four flavones oxygenated at C-2', 3', 4' and 6', and seven flavonols oxygenated at C-2', 4' and 5', each with a 5, 6, 7-trioxygenated structure in ring A, were synthesized for comparison with brickellin and apulein. The structures of brickelin and apulein were thus confirmed to be 2', 5-dihydroxy-3, 4', 5', 6, 7-pentamethoxyflavone and 2', 5'-dihydroxy-3, 4', 5, 6, 7-pentamethoxyflavone, respectively. The differences between flavones oxygenated at 2', 3', 4' and 6', and flavonols oxygenated at C-2', 4', 5' are discussed on the basis of spectroscopic data.
合成了四种2'、3'、4'、6'位羟基化的黄酮及七种2'、4'、5'位羟基化的黄酮醇,它们均在A环的5、6、7位上羟基化,与brickellin和apulein进行对比,确认了brickellin和apulein的结构分别为2',5'-二羟基-3',4',5',6',7-五甲氧基黄酮及2',5-二羟基-3',4',5,6,7-五甲氧基黄酮。根据波谱数据讨论了2'、3'、4'、6'位羟基化的黄酮及C-2'、4'、5'位羟基化的黄酮醇之间的区别。