Journal ArticleDOI
Triterpenes of Lithocarpus species
TLDR
The triterpenes of the five Lithocarpus species examined comprised members of the friedo- and unrearranged oleanane groups, viz. friedelin, friedelan-3β-ol, taraxerol and β-amyrin, with three new cycloartane triterPenes found in L. polystachya.About:
This article is published in Phytochemistry.The article was published on 1974-11-01. It has received 21 citations till now. The article focuses on the topics: Oleanane & Taraxerol.read more
Citations
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Journal ArticleDOI
Palladium-Catalyzed Carboetherification and Carboamination Reactions of γ-Hydroxy- and γ-Aminoalkenes for the Synthesis of Tetrahydrofurans and Pyrrolidines
TL;DR: Substituted tetrahydrofuran and pyrrolidine moieties are displayed in a wide range of interesting biologically active molecules and the Pd-catalyzed carboetherification or carboamination is a powerful tool for the construction of these heterocycles.
Journal ArticleDOI
Bioactive Flavaglines and Other Constituents Isolated from Aglaia perviridis
Li Pan,Ulyana Muñoz Acuña,Jie Li,Nivedita Jena,Tran Ngoc Ninh,Caroline M. Pannell,Heebyung Chai,James R. Fuchs,Esperanza J. Carcache de Blanco,Djaja D. Soejarto,A. Douglas Kinghorn +10 more
TL;DR: Eight new compounds, including two cyclopenta[b]benzopyran derivatives (1, 2), two cycloartane triterpenoids (5-7), and an apocarotenoid (8), together with 16 known compounds, were isolated from the chloroform-soluble partitions of separate methanol extracts of a combination of the fruits, leaves, and twigs and of the roots of Aglaia perviridis collected in Vietnam.
Journal ArticleDOI
Friedelin and associated triterpenoids
TL;DR: A review of the literature relating to the structure elucidation, physical properties, synthesis and biosynthesis of 3-friedelanols is presented in this article, along with a list of compounds possessing the same carbon skeleton and occurring with at least one of the above derivatives.
Journal ArticleDOI
Two new cycloartane-type triterpenoids and one new flavanone from the leaves of Dasymaschalon dasymaschalum and their biological activity
TL;DR: Two new cycloartane-type triterpenoids, 3β-hydroxy-21- O -acetyl-24-methylenecycloeartane (3 ) and 3β,21-dihydroxy-24,31-epoxy-24 -methylenectycloartANE (4 ), were isolated from the leaves of Dasymaschalon dasymaschum as discussed by the authors.
Journal ArticleDOI
Curculigol, a cycloartane triterpene alcohol from Curculigo orchioides
TL;DR: A triterpene alcohol curculigol, characterized as 24-methylcycloart-7-en-3β,20-diol, has been isolated from the rhizomes of Curculigo orchioides and identified on the basis of chemical and spectroscopic evidence as discussed by the authors.
References
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Journal ArticleDOI
Mass spectrometry in structural and stereochemical problems. CXLVI. Mass spectrometric fragmentations typical of sterols wit unsaturated side chains
S. G. Wyllie,Carl Djerassi +1 more
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Mass spectrometry in structural and stereochemical problems. CLXI - Elucidation of the course of the characteristic ring D fragmentation of steroids.
TL;DR: In this article, the impact induced fragmentation of ring D in steroids involving loss of carbon atoms analyzed by mass spectrometry was studied and the results showed that carbon atoms were lost in the process.
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NMR signals of methyl groups of triterpenes with oxygen functions at positions 2, 3 and 23
TL;DR: In this article, the additive shielding effects of various substituents on the Me resonance frequencies have been deduced from NMR signals of triterpenes of the ursane, oleanane, and lupane series.
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Mass spectrometry of tetracyclic triterpenes part II. The lanostane group: Influence of the 9:19-cyclopropane ring.
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Constituents of Dipterocarpaceae Resins. IV. Triterpenes of Shorea acuminata and S. resina-nigra
TL;DR: In this paper, the structures given to the two cis 2,3-diols resulting from osmium tetroxide oxidation of methyl oleana-2,12-dien-28-oate were revised.