Journal ArticleDOI
Agrostophyllin, a naturally occurring phenanthropyran derivative from Agrostophyllum khasiyanum
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TLDR
Agrostophyllin, the first naturally occurring phenanthropyran derivative, was isolated from the orchid AgrostophyLLum khasiyanum and it was shown to be able to biosynthesise nonvolatile substance such as polymethine.About:
This article is published in Phytochemistry.The article was published on 1988-01-01. It has received 26 citations till now. The article focuses on the topics: Agrostophyllum & Derivative (chemistry).read more
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Book ChapterDOI
Secondary Metabolites of Plants
TL;DR: Orchid phytochemicals that have been studied include alkaloids, bibenzyls, phenanthrenes, stilbenoids, phenols, flavonoids, anthocyanins and polysaccharides, which exhibit antioxidant, anti-inflammatory, antimicrobial, antihelminthic, anticoagulant, antidiabetic and lipid-lowering properties.
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
[3,3]‐Sigmatropic Rearrangement Step in the Gold‐Catalyzed Cyclization of Allyl‐(ortho‐alkinylphenyl)methyl Ethers
Martin N. Ackermann,Janina Bucher,Melissa Rappold,Katharina Graf,Frank Rominger,A. Stephen K. Hashmi +5 more
TL;DR: The mechanistic studies show an allylic inversion, as supported by NMR data and an X-ray crystal structure analysis, as well as an intermolecular reaction, as determined by crossover experiments and clearly indicate product formation by a [3,3]sigmatropic rearrangement in the step forming the new C-C bond.
Journal ArticleDOI
Phenanthrene derivatives from the orchid Coelogyne cristata.
P.L Majumder,S Sen,S Majumder +2 more
TL;DR: The structures of coelogsinanthridin and coeloginanthrin were established as 3,5,7-trihydroxy-1,2-dimethoxy-9,10-dihydrophenanthrene and 3,4,5-triHydroxy-2,4-dimETHoxyphenanthene, respectively, which may have biological activities of phytoalexins and endogenous plant growth regulators.
Journal ArticleDOI
Bioactive Secondary Metabolites from Orchids (Orchidaceae).
TL;DR: A review of the literature on orchids that are used in traditional medicine has been reviewed in this work indicating a great potential of such organisms as source of chemical entities for the development of new drugs as mentioned in this paper.
References
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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.
Related Papers (5)
Structure of flavanthrin, the first dimeric 9,10-dihydrophenanthrene derivative from the orchid eria flava
Pralay Majumder,Subhra Banerjee +1 more
Coelonin, A 9,10-dihydrophenanthrene from the orchids Coelogyne ochracea and Coelogyne elata
Confusarin and confusaridin two phenanthrene derivatives of the orchid Eria Confusa
P.L. Majumder,Amita Kar +1 more