C-glycosylanthocyanidins synthesized from C-glycosylflavones

Nine C-glycosyl-3-deoxyanthocyanidins were for the first time synthesized from their respective C-glycosylflavones. 6,8-Di-C-β-glucosylapigeninidin and 6,8-di-C-β-glucosyl-4′-O-methylluteolinidin with C-C linkages between the sugar moieties and the aglycone, were found to be far more stable towards acid hydrolysis than pelargonidin 3-O-glucoside, which has the common anthocyanidin C-O linkage between the sugar and the aglycone.