The absolute configuration of biflavonoids and 2-benzyl-2-hydroxybenzofuranones
Abstract
Reductive cleavage of the C-ring of the zeyherin epimers 2 and 4 with sodium cyanoboranuide [Na(CN)BH2] permits the first assessment of the absolute configuration of biflavonoids and 2-benzyl-2-hydroxybenzofuranones.