Synthesis of enantiomerically pure unusual ellagitannins 1,4,6-tri-O-galloyl-2,3-(R)-hexahydroxydiphenoyl-β-D-glucopyranoside and 4,6-di-O-galloyl-2,3-(R)-hexahydroxydiphenoyl-D-glucoside.: The proposed chemical structures for cercidinin A and B must be revised

The total syntheses of the enantiomerically pure unusual ellagitannins 1,4,6-tri-O-galloyl-2,3-(R)-hexahydroxydiphenoyl-beta-D-glucopyranoside (1) and 4, 6-di-O-galloyl-2,3-(R)-hexahydroxydiphenoyl-D-glucoside (2) are reported. The NMR data of the synthetic ellagitannins 1 and 2 are not identical with those reported for cercidinin A and B. Thus, the proposed structures for cercidinin A and B must be revised.