- Constituents of fagaceae (Cupuliferae). XIX: Triterpene saponins and acylated flavonoids from Quercus robur L. var. stenocarpa Beck.
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In addition to four known glycosides from leaves of Quercus robur L. var. stenocarpa Beck. a new triterpene saponin has been isolated and identified as 28-β-D-glucopyranosyl ester of the 2α,3β,19α-trihydroxy-olean-12-ene-24,28-dioic acid (1).
- Romussi,Parodi,Pizza,De Tommasi
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p. 643 - 645
(2007/10/02)
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- New Triterpenes from Barringtonia speciosa Forst
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Three new triterpene acids, viz. bartogenic acid, anhydrobartogenic acid and 19-epibartogenic acid, have been isolated from the fruits of Barringtonia speciosa.The structures and stereochemistry of these acids have been established as 2α,3β,19α-trihydroxyolean-12-ene-24,28-dioic acid (1), 2α,3β-dihydroxyolean-12,18-diene-24,28-dioic acid (20) and 2α,3β,19β-trihydroxyolean-12-ene-24,28-dioic acid (22) respectively based on 1H, 13C NMR and mass spectral data, chemical reactions and finally conversion of dimethyl bartogenate (2) into the known triterpene, methyl sericiate (8).
- Rao, G. S. R. Subba,Prasanna, S.,Kumar, V. P. Sashi,Yadagiri, Bathini
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p. 113 - 122
(2007/10/02)
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