Mild alkaline hydrolysis of some 7-O-flavone glycosides. Application to a novel access to rutinose heptaacetate

Alkaline hydrolysis of some 7-O-flavone glycosides was performed through the 6,8-dibromo derivative. When the sugar linked to the aglycon has a 2-hydroxy group trans to the sugar–aglycon bond as in β-D-glucosides or rutinosides, hydrolysis occurred at room temperature under very mild conditions. Application to a novel preparation of rutinose heptaacetate by hydrolysis of a diosmin derivative is described.