7-CARBOXYMETHYLOXY-3 , 4 , 5-TRIMETHOXY FLAVONE MONOHYD RATE, THE PREPARATION METHOD AND USES THEREOF

摘要

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.