Journal ArticleDOI
24-Methylene cycloartanyl p-hydroxycinnamate from the orchid Cirrhopetalum elatum
P.L. Majumder,Anjali Pal +1 more
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From the orchid Cirrhopetalum elatum was isolated a new triterpene of the cycloartane series, which was shown to be 24-methylenecycloartanyl p -hydroxycinnamate from spectral and chemical evidence.About:
This article is published in Phytochemistry.The article was published on 1985-01-01. It has received 26 citations till now.read more
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Review article number 67Triterpenoids
TL;DR: A compilation of the triterpenoids isolated during the period 1982–1989 along with their occurrence, available physical data, spectroscopy and X-ray analysis used for their characterization, is included.
Journal ArticleDOI
Moscatilin, a bibenzyl derivative from the orchid Dendrobium moscatum
P.L. Majumder,R.C. Sen +1 more
TL;DR: Moscatilin, a new bibenzyl derivative isolated from the orchid Dendrobium moscatum, was shown to have the structure 4,4′-dihydroxy-3,3′,5-trimethoxybibensyl.
Journal ArticleDOI
Isolation and characterisation of intact steryl ferulates from seeds
TL;DR: The feasibility of the above approach was established using the well characterised steryl ferulate mixture γ-oryzanol obtained from rice bran oil, and the methods were subsequently applied to the analysis of theSteryl ferulates present in seeds of maize.
Journal ArticleDOI
Structure of flavanthrin, the first dimeric 9,10-dihydrophenanthrene derivative from the orchid eria flava
Pralay Majumder,Subhra Banerjee +1 more
TL;DR: Flavanthrin, the first dimeric 9,10-dihydrophenanthrene derivative, was isolated from the orchid Eria flava which also yielded the previously reported 9, 10-dibhrenanthrene coelonin this paper.
Journal ArticleDOI
Confusarin and confusaridin two phenanthrene derivatives of the orchid Eria Confusa
P.L. Majumder,Amita Kar +1 more
TL;DR: Two new polyoxygenated phenanthrene derivatives, confusarin and confusaridin, are isolated from the orchid Eria confusa and are shown to be 2,7-dihydroxy-3,4,8-trimethoxyphenanthrene and 2,6- dihydrox-2,6,7, 8-tetramethoxyrene, respectively.
References
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Carbon‐13 NMR spectra of some tetra‐ and pentacyclic triterpenoids
TL;DR: In this article, the carbon-13 NMR spectra of tetra-and pentacyclic triterpenoid spectra have been obtained for methyl, methylene, methine and quaternary carbon atoms.
Journal ArticleDOI
A new triterpenoid alcohol, 24-methylenecycloartanol, as its ferulate, from rice bran oil.
Genkichi Ohta,Masao Shimizu +1 more
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Two pentacyclic triterpenes from Rubia cordifolia
TL;DR: Rubicoumaric acid and rubifolic acid isolated from Rubia cordifolia have been shown to be 30-hydroxy-3β-p-Hydroxycoumaryloxy-urs-12-ene-28-oic acid or 3β,30-dihydroxy-urs 12-ene,28- oic acid respectively on the basis of 1H NMR, 13C NMR and mass spectral and chemical evidence.
Journal ArticleDOI
Structure of oxoflavidin, a 9,10-dihydrophenanthropyrone from Coelogyne elata
P.L. Majumder,N. Datta +1 more
TL;DR: In this paper, a new phenolic compound isolated from the Himalayan orchid Coelogyne elata was shown to be 2,7-dihydroxy-9,10-Dihydro-5H-phenanthro[4,5-bcd]pyran-5-one (2d) by spectral and chemical evidence.
Journal ArticleDOI
Triterpenes of Lithocarpus species
TL;DR: 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.
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Bulbophyllanthrin, a phenanthrene of the orchid Bulbophyllum leopardium
Confusarin and confusaridin two phenanthrene derivatives of the orchid Eria Confusa
P.L. Majumder,Amita Kar +1 more