The structure and stereochemistry of phlogantholide-A, a new diterpene lactone isolated from the leaves of Phlogacanthus thyrsiflorus has been determined as 2β,15,18-trihydroxy-ent-labd-8(17),13-dien-16-oic lactone by chemical and spectroscopic means. © 1985.

A K BARUA

M K CHOWDHURY

S BISWAS

C D GUPTA

S K BANERJEE

S K SAHA

A PATRA

A K MITRA

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

The structure and stereochemistry of phlogantholide-A, a diterpene from Phlogacanthus thyrsiflorus

Phytochemistry

Phloganthoside-a diterpene lactone glucoside from Phlogacanthus thyrsiflorus

Carbon‐13 signal assignments of the labdane diterpenoids phlogantholide‐A, its diacetate and isophlogantholide‐A are reported. The assignments of the 13C NMR signals of 14‐deoxyandrographolide and its diacetate, made earlier, have now been confirmed by lanthanide shift studies on the former and also by 13C spectral studies on anhydroandrographolide diacetate and 14‐deoxy‐11,12‐didehydroandrographolide diacetate. Copyright © 1981 Heyden &amp; Son Ltd.

Organic Magnetic Resonance

Carbonâ€13 NMR spectra of some labdane diterpenoids

Carbon‐13 NMR signal assignments of the labdane diterpenoids andrographolide and 14‐deoxyandrographolide, along with their acetates, and isodeoxyandrographolide have been made. This study indicates that the C‐6 and C‐11 resonance assignments of isovirescenol‐B, made earlier, should be interchanged. Copyright © 1981 Heyden & Son Ltd.

Carbonâ€13 NMR spectral studies on some labdane diterpenoids

Tetrahedron

The structure and stereochemistry of neoandrographolide, a diterpene glucoside from Andrographis paniculata nees

Tetrahedron Letters

The structure of neoandrographolide - a diterpene glucoside from andrographis paniculata nees

Andrographolide

Journal	Phytochemistry
Publisher	-
ISSN	0031-9422