Showing papers on "Triterpene published in 1980"
207 citations
TL;DR: In this paper, two triterpene glycosides, momordicosides A and B, were isolated from the seeds of Momordica charantia L. (Cucurbitaceae).
Abstract: Two triterpene glycosides, momordicosides A and B, were isolated from the seeds of Momordica charantia L. (Cucurbitaceae). Their structures were determined on the basis of spectral and chemical evidence and by X-ray analysis as the 3-O-β-gentiobioside and 3-O-β-D-xylopyranosyl (1→4)-[β-D-glucopyranosyl(1→6)]-β-D-glucopyranoside, respectively, of cucurbit-5-ene-3β, 22(S), 23(R), 24(R), 25-pentaol.
90 citations
TL;DR: In this paper, twelve triterpenes in the lup-20(29)-ene and olean-12-ene series have been isolated from the triterpene glycoside and lipid fractions of organ pipe cactus.
49 citations
30 citations
TL;DR: Triterpene alcohol constituents of unsaponifiable lipids separated from tea seed oil from the seed kernels ofButyrospermum parkii (Sapotaceae) were studied in this article.
Abstract: Triterpene alcohol constituents of the unsaponifiable lipids separated from tea seed oil fromThea sinensis L. (Theaceae), camellia seed oil fromCamellia japonica L. (Theaceae), pokeweed seed oil fromPhytolacca americana L. (Phytolaccaceae) and shea butter from the seed kernels ofButyrospermum parkii (Sapotaceae) were studied. Among a number of triterpene alcohols present in these oils, 19 components were identified as cycloartenol, 24-methylenecycloartanol, parkeol, 24-methylene-24-dihydroparkeol, lanosterol, euphol, butyrospermol, tirucallol, tirucalla-7,24-dienol, dammaradienol, 24-methylenedammarenol, α-amyrin, β-amyrin, lupeol, germanicol, taraxasterol, ψ-taraxasterol, taraxerol and myricadiol. Tirucalla-7,24-dienol and butyrospermol are the predominant components of the 2 Theaceae and pokeweed seed oils. Shea butter, on the other hand, contains α-amyrin followed by butyrospermol and lupeol as the major triterpene constituents.
29 citations
TL;DR: The triterpene alcohol represents the parent compound of a number of cucurbitacins, highly oxygenated tetracyclic triterpenes found in Cucurbitaceae and some other flowering plants.
Abstract: 10α-Cucurbita-5,24-dien-3β-ol was isolated from the unsaponifiable matter of the seed oil of gourd (Lagenaria leucantha var.Gourda; Cucurbitaceae); it has been previously synthesized, but never found in the plant kingdom. The triterpene alcohol represents the parent compound of a number of cucurbitacins, highly oxygenated tetracyclic triterpenes found in Cucurbitaceae and some other flowering plants.
19 citations
18 citations
TL;DR: In this article, the natural sweeteners of Periandra dulcis afforded new triterpene glycosides, periandrin II (3-β- O -[β-d -glucuronopyranosyl-(1→-2)-β- d -gulnarosyl]-25-formyl-olean-12(13)-en-30-oic acid).
17 citations
15 citations
Journal Article•
12 citations
TL;DR: In this article, a triterpene (I) was isolated from the unsaponifiable fraction of an ethereal extract of the leaves ofBetula mandschurica to which, on the basis of the results of a physicochemical investigation and a comparison of the13C spectra with the spectra of known triterpenes, the structure of 20(S),24(S)-dihydroxydammar-25-3n-3-one has been assigned.
Abstract: A new triterpene (I) has been isolated from the unsaponifiable fraction of an ethereal extract of the leaves ofBetula mandschurica to which, on the basis of the results of a physicochemical investigation and a comparison of the13C spectra with the spectra of known triterpenes — ocotillone (II) and 20(S)-hydroxydammar-24-en-3-one (III) — the structure of 20(S),24(S)-dihydroxydammar-25-3n-3-one has been assigned. An approach to the determination of the configuration of the asymmetric center at C24 in 24-hydroxy derivatives of tetracyclic triterpenoids with an open side chain by the use of13C NMR spectroscopy is proposed.
TL;DR: The structure of rhuslactone, a triterpene with a novel dammarane-type skeletal structure, having a 17α-oriented side chain, isolated from the bark of Rhus javanica L, has been established from spectral data and by single crystal X-ray analysis of its corresponding triol as mentioned in this paper.
Abstract: The structure of rhuslactone (1), a new triterpene with a novel dammarane-type skeletal structure, having a 17α-oriented side chain, isolated from the bark of Rhus javanica L., has been established from spectral data and by single crystal X-ray analysis of its corresponding triol (3).
TL;DR: In this paper, an X-ray study of the adduct formed by hexakis (p - t -butylphenylthiomethyl)benzene (I) with squalene (II) establishes the first example of channel-type inclusion behaviour for a hexahost molecule, the guest triterpene being observed in a novel conformation controlled by host-guest interactions.
TL;DR: The free triterpenes identified as constituents of Emmenospermum pancherianum Baill are ceanothic acid (wood), betulic acid (bark), and the new triterpene, 18α,24-dihydroxy-A(1)-norlupa-2,20(29)-diene-27,28-dioic acid 28-methyl ester 27,18α-lactone (1a) as mentioned in this paper.
Abstract: The free triterpenes identified as constituents of Emmenospermum pancherianum Baill. are ceanothic acid (wood), betulic acid (bark), and the new triterpene, 18α,24-dihydroxy-A(1)-norlupa-2,20(29)-diene-27,28- dioic acid 28-methyl ester 27,18α-lactone (1a) (bark); the structure of the last has been determined by spectroscopic analysis. Both wood and bark contained saponin which in each case on acid hydrolysis gave ebelin lactone, and two new sapogenins, 24,25-dihydroebelin lactone (9a)and the tetracarbocyclic triterpenoid (10a) possessing an aromatic ring D; all three sapogenins are secondary sapogenins. The primary sapogenins jujubogenin (11a) and dihydrojujubogenin (12a)have been obtained by degradation of the wood saponin, and dihydrojujubogenin has been shown to be the precursor of (9a) and (10a).
Journal Article•
TL;DR: In this article, the benzine extract from the herb of Sonchus asper Vill was used as a good source of pentacyclic triterpenoids and triterpene alcohols (9.8%), their acetates (16.1%), and their long chain fatty acid esters (4.6%) represent 30.5% of benzine extracts.
Abstract: Pentacyclic triterpene alcohols (9.8%), their acetates (16.1%), and their long chain fatty acid esters (4.6%) represent 30.5% of the benzine extract from the herb of Sonchus asper Vill. (Compositae). The composition of triterpene alcohols was : α-amyrin (4%), β-amyrin (8%), germanicol (6%), Ψ-taraxasterol (17%), taraxasterol (36%), lupeol (28%), and other unidentified components (1%); and that of triterpene acetates was : α-amyrin acetate (3%), β-amyrin acetate (8%), germanicol acetate (5%), Ψ-taraxasterol acetate (19%), taraxasterol acetate (21%), and lupeol acetate (44%). Triterpene alcohol moiety of the long chain fatty acid esters was Ψ-taraxasterol only. The results indicate that the benzine extract from S. aspen Vill, can be used as a good source of pentacyclic triterpenoids.
TL;DR: An X-ray study of triterpene T(C30H48O3) has shown that the related compounds Q, T, and U which are derivatives of 1,3-diketofriedelane have their third oxygen function at C(26) intead of C(24) as previously proposed as discussed by the authors.
Abstract: An X-ray study of triterpene T(C30H48O3) has shown that the related compounds Q, T, and U which are derivatives of 1,3-diketofriedelane have their third oxygen function at C(26) intead of C(24) as previously proposed; rings D and E occur in a cis-fused boat–boat (‘trimaran’) conformation.
TL;DR: In this article, the unsaponifiable part of an ethereal extract of the leaves of Betula ermanii has been extracted and two previously unknown triterpenes (II) and (I) have been isolated to which, previously, the structures of 20, 24-epoxydammarane-3β,6α,25-triol and its 6α-acetate were erroneously ascribed.
Abstract: From the unsaponifiable part of an ethereal extract of the leaves ofBetula ermanii two previously unknown triterpenes (II) and (I) have been isolated to which, previously, the structures of 20, 24-epoxydammarane-3β,6α,25-triol and its 6α-acetate were erroneously ascribed. A further study of the1H and13C spectra of compounds (II) and (I), and also the spectra of their derivatives — the diketone (III) and the epimer of the triterpene (II) at C11 (IV) — has shown that the triterpene (II) has the structure of 20(S),24(R)-epoxydammarane-3β,11α,25-ttriol, and the triterpene (I) is its 11α-acetate. Triterpenes (I) and (II) are the first examples of natural 11-hydroxylated C30-triterpenes of the dammarane type.