Showing papers on "Triterpene published in 1989"
TL;DR: Six additional compounds having no cytotoxic activity were isolated and a new triterpene, 3-O-trans-p-coumaroyltormentic acid, was established on the basis of X-nucleus-proton correlation with fixed evolution time (XCORFE) and other spectroscopic evidence.
Abstract: Bioactivity-guided fractionation of the methanol extract of Goreishi (the feces of Trogopterus xanthipes Milne-Edwards) afforded one new and three known cytotoxic triterpenes, namely, 3-O-cis-p-coumaroyltormentic acid, pomolic acid, 2 alpha-hydroxyursolic acid, and jacoumaric acid. In the course of this investigation, six additional compounds having no cytotoxic activity were isolated, namely, maslinic acid, 3-O-trans-p-coumaroylmaslinic acid, ursolic acid, tormentic acid, euscaphic acid, and a new triterpene, 3-O-trans-p-coumaroyltormentic acid. The structures of the new compounds were established on the basis of X-nucleus-proton correlation with fixed evolution time (XCORFE) and other spectroscopic evidence.
133 citations
TL;DR: In this article, the signal peaks of the protons on oxygen-bearing carbon atoms were analyzed for configurational determination of 2,3-dihydroxy and 2, 3,23- and 2.3,24-trihydroxy substituents in triterpenoids.
115 citations
TL;DR: Three monoaromatic pentacyclic triterpenoids of the lupane, ursane and oleanane series have been synthesised and shown to occur in several geological samples.
109 citations
TL;DR: In this article, the structures of a triterpene, belleric acid, and its glucoside, Bellericoside have been defined as 2α,3β,23,24,tetrahydroxyolean-12-en-28-oic acid and its β-d -glucopyranosyl ester.
76 citations
TL;DR: A new triterpene, tetramethylsqualene, produced by Botryococcus braunii var showa, was isolated and characterized by NMR and mass spectroscopy as mentioned in this paper.
69 citations
TL;DR: Two new sweet oleanene-type triterpene oligoglycosides, named apioglycyrrhizin and araboglycine, were isolated from the air-drie root of Glycyrhiza inflata and their structures have been determined on the basis of chemical and physicochemical evidence as mentioned in this paper.
Abstract: Two new sweet oleanene-type triterpene oligoglycosides, named apioglycyrrhizin and araboglycyrrhizin, were isolated from the air-drie root of Glycyrrhiza inflata [Chinese Glycyrrhizae Radix, Shinkyo-kanzo in Japanese], and their structures have been determined on the basis of chemical and physicochemical evidence.
55 citations
TL;DR: Two new triterpenes identified on the basis of spectral characteristics exhibited hepatoprotective activity in primary cultured rat hepatocytes intoxicated with D-galactosamine and olean-12-ene-3 alpha, 16 beta-diol.
Abstract: Canarium album has yielded seven triterpenes of which two appear to be novel. The new triterpenes, which were identified on the basis of spectral characteristics, are urs-12-ene-3 alpha, 16 beta-diol and olean-12-ene-3 alpha, 16 beta-diol. Both compounds exhibited hepatoprotective activity in primary cultured rat hepatocytes intoxicated with D-galactosamine.
46 citations
TL;DR: In this paper, a triterpene from Achillea odorata L. has been isolated, and its structure established on the basis of its spectroscopic properties as well as those of its acetylderivative 1b.
39 citations
TL;DR: A new pentacyclic triterpene with anti-inflammatory activity was isolated from the roots of Commiphora merkeri and established on the basis of spectral data and conversion to its triacetate.
Abstract: A new pentacyclic triterpene [1] with anti-inflammatory activity was isolated from the roots of Commiphora merkeri. The structure was established on the basis of spectral data and conversion to its triacetate.
36 citations
TL;DR: The structure and stereochemistry for abrusoside A (1), an intensely sweet glycosidic constituent of Abrus precatorius leaves, based on the cycloartenol carbon skeleton was reported in this paper.
Abstract: The structure and stereochemistry are reported for abrusoside A (1), an intensely sweet glycosidic constituent of Abrus precatorius leaves, based on the cycloartenol carbon skeleton.
35 citations
TL;DR: The structure of triterpenoid trisaccharide isolated from the seeds of Acacia auriculiformis has been elucidated as acacic acid lactone-3- O -β-d -glucopyranosyl (1 → 6)-[α- l -arabinopyranoyl ( 1 → 2)]-β- d -glocopyraniumide based on its spectral properties and some chemical transformations as mentioned in this paper.
TL;DR: In this paper, nine pentacyclic triterpenoids along with a coumarin have been isolated from the fresh, undried and uncrushed spring leaves of Plumeria obtusa.
TL;DR: An acyclic triterpene isolated from the Phyllanthus niruri was shown to be 3,7,11,15,19,23-hexamethyl-2 Z,6 Z,10 Z,14 E,18 E,22 E -tetracoshexen-1-ol by spectral chemical methods as mentioned in this paper.
TL;DR: A triterpene, euphorginol, has been isolated from the fresh and undried stem bark of Euphorbia tirucalli as discussed by the authors, which has been elucidated as taraxer-14-en-6α-ol through chemical and spectral studies including 2D NMR and NOE difference measurements.
TL;DR: A new bitter triterpene ester glucoside has been isolated in this article along with other triterpenes, such as ulsolic acid, rotundic acid, and rotungenic acid.
Abstract: A new bitter triterpene ester glucoside have been isolated along with known bitter triterpene glucoside peduncloside and some minor triterpenes ulsolic acid, rotundic acid, and rotungenic acid from...
TL;DR: A new diterpene, named antiquorin, was isolated from Euphorbia antiquorum as discussed by the authors, which was elucidated by spectral analysis to be an atisine ditterpene cis-fused between the A and B rings.
TL;DR: In this paper, from tissue callus of Panax japonicus grown in South Kyushu, two ginseng dammarane saponins, ginsenosides Rg1 and Re, and an oleanane (desglucosylchikusetsusaponin-IV) together with chikusetusapon in-IV were isolated.
TL;DR: In this paper, a triterpene diglucoside, Randianin, was isolated from methanolic extracts of the fruits of Randia dumetorum.
TL;DR: In this article, two rearranged abietane diterpenoids, candesalvones A and B, have been isolated from the aerial parts of Salvia candelabrum.
TL;DR: Two new pentacyclic triterpenes, kanerin 111 and 12,13-dihydroursolic acid have been isolated from the fresh, uncrushed, winter leaves of N.m'um oleander, and their structures have been established as 24-nor-3p, 5- dihydroxyursa-4(23), 18-dien-28-oic acid and 3P-hydroxyuaa- 28-o
Abstract: TWO new pentacyclic triterpenes, kanerin 111 and 12,13-dihydroursolic acid (5) have been isolated from the fresh, uncrushed, winter leaves ofNm'um oleander, and their structures have been established as 24-nor-3p, 5-dihydroxyursa-4(23), 18-dien-28-oic acid and 3P-hydroxyuaa-28-oic acid, respectively, through chemical and spectral studies. Nerium oleander L. (syn. Nerium ohrum, Apocynaceae), commonly known as "kaner, " is distributed in the Mediterranean region and subtropical Asia and is indigen- ous to the Indo-Pakistan subcontinent. Its various parts are reputed to be therapeutic in the treatment of swellings, leprosy, and eye and skin diseases. The leaves also possess cardiotonic and antibacterial properties (1,2). Studies on the chemical constituents of different parts of the plant have led to the isolation of several cardiac glycosides and triterpenoids (3,4). In the course of studies on the constituents of the fresh leaves ofN. oleander, two new cardiac glycosides and several triterpenes (5,6) have recently been re- ported. The present paper deals with the isolation and structure elucidation of two new,
TL;DR: Euphorcinol, a new triterpene of the friedelane group, has been isolated from the fresh and un-dried stem bark of EUPHORBIA TIRUCALLI on the basis of chemical and spectroscopic studies including 2D-NMR.
Abstract: Euphorcinol, a new triterpene of the friedelane group, has been isolated from the fresh and un-dried stem bark of EUPHORBIA TIRUCALLI. The structure 1 is assigned to it on the basis of chemical and spectroscopic studies including 2D-NMR.
TL;DR: A new triterpene magnificol is isolated from Achillea magnifica together with four acetylenic compounds which were not previously obtained from Achillesa species.
Abstract: We have isolated from Achillea magnifica a new triterpene magnificol together with four acetylenic compounds which were not previously obtained from Achillea species. Other compounds were also obtained
TL;DR: In this article, triterpenoid sapogenols were obtained from the hydrolysate of the crude saponin fraction of Abri Herba, the whole plants of Abrus cantoniensis H ance (Lequminosae).
Abstract: New five triterpenoid sapogenols, designated abrisapogenols B, E, D, F and G (1-5) were obtained from the hydrolysate of the crude saponin fraction of Abri Herba, the whole plants of Abrus cantoniensis H ance (Lequminosae). Their structures were determined by spectroscopic and X-ray analysis.
TL;DR: The mature stem of Diploclisia glaucescens furnished a new bidesmosidic saponin, which was established by chemical and spectroscopic methods as β-d -glucopyranosyl 3β-(β- d -glocopyranoyloxy)-23-hydroxy-30-carbomethoxyolean- 12-en-28-oate as discussed by the authors.
TL;DR: A new triterpenoid saponin was isolated from the tubers of Thladiantha hookeri C. B. Clarke var.
TL;DR: Two new triterpenes have been isolated from the fresh, undried and uncrushed leaves of Nerium oleander and their structures established as 3β- p -hydroxyphenoxy-11α-methoxy-12α-hydroxy-20-ursen-28-oic acid and 28-hydoxy-20 (29)-lupen-3,7-dione, respectively.
TL;DR: A triterpene alcohol characterized as 3β-hydroxy-23,24,24-trimethyllanosta-9(11)-25-diene has been isolated from the aerial parts of Clausena lansium as mentioned in this paper.
TL;DR: The three new 14(15)-ene-quinone-methide triterpenoids, balaenonol, isobalaendiol, and balaenaenol, isolated from Cassine balae have been shown to be 3,21β-dihydroxy-2,22-dioxo-3,5,7,10(1),14-(15)-pentaen-(14→15)-D:A-friedo-24,29-dinoroleanane (1), 3.21β,22β