Synthesis of vicenin-1 and 3, 6,8- and 8,6-di-C-β-d-(glucopyranosyl-xylopyranosyl)-4′,5,7-trihydroxyflavones using two direct C-glycosylations of naringenin and phloroacetophenone with unprotected d-glucose and d-xylose in aqueous solution as the key reac
Keywords: Direct C-glycosylation; Sc(OTf)3; Naringenin; Phloroacetophenone