The present invention relates to a process to prepare 7-carboxymethyloxy-3',4',5-trimethoxy flavone using 3',5,7-trihydroxy-4'-methoxy flavone-7-rutinoside as starting material. The process comprises the steps 1) selective 3-hydroxy methylation followed by acidic hydrolysis of the glycoside bond, 2) 7-hydroxy alkylation with alpha-haloacetate, 3) 5-hydroxy methylation and 4) deprotection of the 7-esther group.
本发明涉及一种以 3',5,7-三羟基-4'-甲氧基
黄酮-7-
芸香糖苷为起始原料制备 7-羧甲基氧基-3',4',5-
三甲氧基黄酮的工艺。该工艺包括以下步骤:1)选择性 3-羟基甲基化,然后对苷键进行酸性
水解;2)用α-卤
乙酸进行 7-羟基烷基化;3)5-羟基甲基化;4)对 7-醚基进行脱保护。