ChemInform Abstract: Triterpenoid Constituents from Gardenia imperialis.

Babady‐Bila, Babady‐Bila; Tandu, Kulio

doi:10.1002/chin.198806283

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“…3 However, until now the triterpene glycosides of this plant have not been examined. In a continuation of our study regarding the chemical constituents of plant species that are used in folk medicine in the Democratic Republic of Congo, [4][5][6] we herein describe the structural characterisation of eleven pentacyclic triterpene glycosides resulting from the acetylation of a mixture of triterpene glycosides isolated from Combretum psidioides. On the basis of spectroscopic data the acetylated compounds were characterised as genuine acetates or as acetylation artifacts derived from eight known oleanane and ursane triterpene glucosides : arjunglucoside I (4), 7 quadranoside III (6), 8 arjunetin (9), 9 nigaichigoside F1 (11), 10 combreglucoside (13), 11 chebuloside II (15), 12 trachelosperoside E-1 (17), 13 and trachelosperoside B-1 (19)…”

Section: Introductionmentioning

confidence: 99%

Acetylation products of pentacyclic triterpene glucosides from Combretum psidioides

Kilonda¹,

Babady-Bila²,

Lohohola³

et al. 2002

Arkivoc

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Following acetylation of a mixture of triterpene glycosides extracted from the root bark of Combretum psidioides eleven oleanane and ursane triterpene type glycosides were isolated. Their structures were established by spectral analysis and by comparison with related compounds; all acetylated derivatives could be correlated with known triterpene glycosides. Attempted acetylation of the sterically hindered 19α-OH group of arjunglucoside I (4) led to introduction of a (3-acetoxy-2-butenoyl) side chain, due to generation of acetylketene as a more reactive acylating agent.

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