Tannins and Related Compounds. LVIII. Novel Gallotannins Possessing an α-Glucose Core from Nuphar japonicum DC.

Abstract

Together with 6-O-and 2, 3, 4, 6-tetra-O-galloylglucoses, two unusual gallotannins possessing an α-glucopyranose core have been isolated from the rhizomes of Nuphar japonicum DC. (Nymphaeaceae), and their structures have been established as 1, 2, 4-tri-O-galloyl-α-D-glucose (3) and 1, 2, 3, 4, 6-penta-O-galloyl-α-D-glucose (6) on the basis of chemical and spectroscopic evidence.