Journal ArticleDOI
Agrostophyllin, a naturally occurring phenanthropyran derivative from Agrostophyllum khasiyanum
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
Citations
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Agrostophyllol and isoagrostophyllol, two novel diastereomeric 9,10-dihydrophenanthropyran derivatives from the orchid Agrostophyllum callosum
TL;DR: In this paper, two diastereomeric 9,10-dihydrophenanthropyran derivatives isolated from the orchid Agrostophyllum callosum were shown to have the structures 2,7-Dihydroxy-6-methoxy-9, 10-dhydro-5H-phenanthro[4,5-bcd]pyran-5(ax)ol (11 ) and 2.7-dioxioxioxoxy-6.5
Journal ArticleDOI
Triterpenoids from the orchids Agrostophyllum brevipes and Agrostophyllum callosum.
P.L Majumder,S Majumder,S Sen +2 more
TL;DR: Two new triterpenoids were isolated from the orchid Agrostophyllum brevipes, of considerable biogenetic importance, and established as 24-methylene-lanosta-9(11)-en-3beta-ol and 24- methylene- Lanosta-8(11)-en-2-one, respectively.
Journal ArticleDOI
Erianol, a 4α-methylsterol from the orchid Eria convallarioides
P.L. Majumder,Amita Kar +1 more
TL;DR: The structure of erianol was established as 4α,24,24-trimethylcholesta-7,25-dien-3β-ol from spectral and chemical evidence.
Journal ArticleDOI
Four stilbenoids from the orchid Agrostophyllum khasiyanum
TL;DR: The orchid Agrostophyllum khasiyanum, which earlier yielded agrostophylloin (7-hydroxy-2,6-dimethoxy-5 H -phenanthro[4,5- bcd ]pyran-5-one), on further chemical investigation has now yielded four more new stilbenoids, besides imbricatin (2,7-dihydroxy-6-methoxy,9,10-dhydro-5 h-phenanthropanthro [4, 5-b
Journal ArticleDOI
Phenanthropyran derivatives from Phalaenopsis equestris.
TL;DR: Two phenanthropyran derivatives, 3-methoxy-2,7-dihydroxy-5H-phenanthro[4,5-bcd]pyran and 2,3,3-trihydroxy- 5H- phenanthro [4, 5- bcd]Pyran were isolated from the orchid Phalaenopsis equestri and their chemical structures were elucidated from spectroscopic analyses.
References
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Journal ArticleDOI
13C NMR spectroscopy of neolignans
Ernest Wenkert,Hugo E. Gottlieb,Otto R. Gottlieb,Marilia O. da S. Pereira,Mariza Drumond Formiga +4 more
TL;DR: In this article, the 13 C NMR spectra of 15 neolignans of several structural types and two lignans were analyzed and their carbon shifts assigned, and the shifts of pyrogallol ether and ethyl phenyl carbinyl ether models were used in this connection.
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
Nudol, a phenanthrene of the orchids Eulophia nuda, Eria carinata and Eria stricta
TL;DR: An amorphous phenanthrene, named nudol has been isolated from Eulophia nuda, Eria carinata and E. stricta and was identified as 2,7-dihydroxy-3,4-dimethoxyphenanthrene.
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.
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