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Dammarane and Ceanothane Triterpenes from Zizyphus Xylopyra

P. Rambabu, K. Venkata Ramana and S. Ganapaty

From the roots of Zizyphus xylopyra, a new dammarane-type triterpene, pseudojujubogenin-3-O- β-D-glucopyranoside, along with the known ceanothane triterpenes, ceanothic acid and daucosterol were isolated. The structures of the compounds were fully characterized by detailed NMR investigations including 1H and 13C NMR, HSQC, COSY, HMBC and NOESY experiments. In addition, the dammarane glycoside was tested for its potential in inhibiting various bacteria and was found to possess significant bactericidal activity. This is the first report on the chemical constituents of the roots of Zizyphus xylopyra.