Gymnopusin, the first naturally occurring phenanthrene derivative having a hydroxyl group at C-9, was isolated from the orchid Bulbophyllum gymnopus. It was shown to be 7,9-dihydroxy-2,3,4-trimethoxyphenanthrene (1a) mainly from the spectral data of the compound and those of its diacetyl (1b) and dimethyl ether (1c) derivatives. © 1988.

L MAJUMDER

(NEE BHATTACHARYYA) S BANERJEE

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

A ring-B oxygenated phenanthrene derivative from the orchid Bulbophyllum gymnopus

Phytochemistry

Lusianthrin and lusianthridin, two new stilbenoids, were isolated from the orchid Lusia indivisa. The structures of lusianthrin and lusianthridin were established from detailed spectral and chemical evidence. © 1990.

Lusianthrin and lusianthridin, two stilbenoids from the orchid Lusia indivisa

Crepidatin, a bibenzyl derivative from the orchid Dendrobium crepidatum

Agrostophyllin, a naturally occurring phenanthropyran derivative from Agrostophyllum khasiyanum

Moscatilin, a bibenzyl derivative from the orchid Dendrobium moscatum

From the orchid Eria confusa were isolated two new polyoxygenated phenanthrene derivatives, confusarin and confusaridin, which were shown to be 2,7-dihydroxy-3,4,8-trimethoxyphenanthrene and 2,6-dihydroxy-3,4,7,8-tetramethoxyphenanthrene, respectively. © 1987.

Confusarin and confusaridin two phenanthrene derivatives of the orchid Eria Confusa

Cyclootochilone and otochilone, two novel steroidal ketones of the orchids Otochilus porecta were shown to have the structures 1a and 2, respectively, from spectral and chemical evidence, 1a alone has also been obtained from the taxonomically related orchid Otochilus fusca. The significance of these compounds in the biogenetic transformation of lanosterol to steroids and the biogenetic sequence of the origin of 9,19- cyclopropane ring present in some terpenoids and steroids, as well as the mechanism of incorporation of two methyl groups at C-24 of some of these compounds were discussed. © 1985.

Tetrahedron

Structures of cyclootochilone and otochilone, two novel steroidal ketones of the orchids otochilus porecta and otochilus fusca

An amorphous phenanthrene, named nudol has been isolated from Eulophia nuda, Eria carinata and E. stricta. It was identified as 2,7-dihydroxy-3,4-dimethoxyphenanthrene. Synthesis of nudol and its dimethyl ether is described. © 1985.

Nudol, a phenanthrene of the orchids Eulophia nuda, Eria carinata and Eria stricta

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. © 1985.

Journal	Phytochemistry
Publisher	-
ISSN	0031-9422