Two new triterpenes designated querspicatin A and querspicatin B have been isolated from the bark of Quercus spicata. They have been shown to be 3β-(3′,4′-dihydroxycinnamoyloxy)-9α-hydroxy-7-oxo-lup-20 (30)-ene and 3β,9α-dihydroxy-7-oxo-lup-20(30)-ene on the basis of their 1H NMR, 13C NMR and mass spectral data and chemical evidence. © 1989.

S K TALAPATRA

SHRESTHA K MAN

M K PAL

A BASAK

B TALAPATRA

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

Querspicatins A and B, two pentacyclic triterpenes from Quercus spicata

Phytochemistry

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.

Two pentacyclic triterpenes from Rubia cordifolia

Glochidone (1), glochidonol(2) and β-sitosterol were isolated from Glochidion accuminatum while G. thomsoni furnished glochidone (1), lup-20(29)-ene-1β,3β-diol (3) and β-sitosterol. A partial synthesis of glochidone has been achieved in 25% yield by the 2,3-dichloro-5,6-dicyanobenzoquinone dehydrogenation of lupenone. © 1974, CSIRO. All rights reserved.

Australian Journal of Chemistry

Terpenoid constituents of Indian Glochidion species: Glochidion Accuminatum and Glochidion Thomsoni. Partial synthesis of glochidone

L'Audience

Chemical and Pharmaceutical Bulletin

^<13>C Nuclear Magnetic Resonance of Lupane-Type Triterpenes, Lupeol, Betulin and Betulinic Acid

Journal of the Chemical Society (Resumed)

Triterpenoids. Part XV. The constitution of icterogenin, a physiologically active triterpenoid

Journal	Phytochemistry
Publisher	-
ISSN	0031-9422