ELLAGIC COMPOUNDS FROM DIPLOPANAX-STACHYANTHUS

The stem bark of Diplopanax stachyanthus contains the phenolic lactones 3,3′,4′-tri-O-methylellagic acid, 3,3′,4′-tri-O-methylellagic acid 4-O-β-d-glucopyranoside and a new ellagic acid glycoside, 3,3′-di-O-methylellagic acid 4-O-β-d-xylopyranoside. The 13C NMR O-acetyl substituent effects were most useful for characterizing ellagic acid O-di- and trimethyl ethers. These effects are extended to some simple glycosyl derivatives where it is demonstrated not only that the anomeric configuration but also the exact site of the sugar substitution can be determined from such data. © 1990.