Abstract Dried ligulateflowers of Matricariachamomilla contain 7–9% glucosides of apigenin and 0.3–0.5% free apigenin. Glucosides were identified as apigenin7-glucoside and a 1:3 mixture of the 2″- and 6″-acetates, as determined by 13 C NMR analysis.
A straightforward access to neohesperidose from naringin by acetolysis. Comparative behaviour of some flavonoid neohesperidosides and rutinosides under acetolysis
作者:Guy Lewin
DOI:10.1016/j.tet.2013.12.064
日期:2014.2
semisynthesis of neohesperidose was performed in three-steps with 43% overall yield starting from naringin, the main flavonoid of grapefruit. In addition, the behaviour of two pairs of flavonoid 7-O-rhamnoglucosides (neohesperidosides naringin and rhoifolin; rutinosides hesperidin and diosmin) under same acetolysis conditions was compared. Results demonstrated the crucial influence of the oxidation state