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.

P L MAJUMDER

A PAL

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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University Of Calcutta

24-Methylene cycloartanyl p-hydroxycinnamate from the orchid Cirrhopetalum elatum

Phytochemistry

Agrostophyllinol and agrostophyllinone, two new triterpenoids, were isolated from the orchid Agrostophyllum brevipes. Agrostophyllinone was also isolated from another orchid Agrostophyllum callosum. The structures of agrostophyllinol and agrostophyllinone were established as 24-methylene-lanosta-9(11)-en-3β-ol (5a) and 24-methylene-lanosta-9(11)-en-3-one (5c), respectively, from spectral and chemical evidence. The above triterpenoids are of considerable biogenetic importance. © 2002 Elsevier Science Ltd. All rights reserved.

Triterpenoids from the orchids Agrostophyllum brevipes and Agrostophyllum callosum

Volucrin, a new dimeric phenanthrene derivative, was isolated from the orchid Lusia Volucris which also afforded 3',4-dihydroxy-3, 5'-dimethoxy-bibenzyl (2) and the perfumery constituents methyl 2,4-dihydroxy-6-methyl benzoate (3a) and methyl 2,4-dihydroxy-3,-6-dimethyl benzoate (3b). Volucrin was shown to have the structure 1a mainly from spectral evidence. © 1990.

Tetrahedron

Volucrin, a new dimeric phenanthrene derivative from the orchid lusia volucris

Uniflorin, a new steroidal compound of biogenetic importance, isolated from the orchid Coelogyne uniflora was shown to be 24-ethyl-4α,14α,24-trimethyl-9β,19-cyclo-cholest-25-en-3βyl cis-p-hydroxycinnamate from spectral and chemical evidence. © 1990.

A steroidal ester from Coelogyne uniflora

Flaccidinin, a new phenanthropyrone derivative, and oxoflaccidin, the corresponding 9,10-dihydro compound, were isolated from the orchid Coelogyne flaccida which also yielded the previously reported 9,10-dihydrophenanthropyran derivatives flaccidin and imbricatin. The structures of flaccidinin and oxoflaccidin were established from spectral evidence and by chemical correlation. © 1989.

Flaccidinin and oxoflaccidin, two phenanthrene derivatives of the orchid coelogyne flaccida

Crepidatin, a bibenzyl derivative from the orchid Dendrobium crepidatum

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.

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

Oxoflavidin, 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. © 1984.

Structure of oxoflavidin, a 9,10-dihydrophenanthropyrone from Coelogyne elata

Lagerenyl acetate and lagerenol two new tetracyclic triterpenoids with the cycloartane skeleton together with four other triterpenoids 2α-hydroxy- 3β-E-p-coumaryloxy-urs-12-en-28-oic acid (jacoumaric acid, isolated as its monoacetylmethylcarboxylate derivative), 2α-hydroxyursolic acid (isolated as its diacetate), germanicyl acetate and friedelin, and sitosterol were isolated from the leaves and twigs of Lagerstroemia lancasteri. The structures of lagerenyl acetate and lagerenol were established as 3β-acetoxycycloart-24-one and 3β-hydroxycycloart-24-one, respectively, on the basis of spectral and chemical evidence. © 1983.

Lagerenyl acetate and lagerenol two tetracyclic triterpenoids with the cycloartane skeleton from Lagerstroemia lancasteri

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 and 3β,30-dihydroxy-urs-12-ene-28-oic acid(30-hydroxyursolic acid) respectively on the basis of 1 H NMR, 13 C NMR and mass spectral and chemical evidence. © 1981.

Journal	Phytochemistry
Publisher	-
ISSN	0031-9422