A B RAY

(MRS ) A CHATTERJEE

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

Venoterpine--a new monoterpenoid alkaloid from the fruits of Alstonia venenata R.Br.

Tetrahedron Letters

19-Epi-(+)-echitoveniline, a new indole alkaloid of the leaves ofAlstonia venenata R.Br., has been shown to possess the structure and absolute stereochemistry represented by 5b on the basis of spectral and chemical evidence. A mechanistic rationale for the dependence of the mode of LAH reduction of the δ-lactone 11 on its configuration at C-19 has been offered. The influence of the C-19 configuration on the chemical shift values of the C-16 carbomethoxy protons in the 19-aroyloxy-(+)-and (-)-vincadifformine alkaloids has been discussed. © 1981.

Tetrahedron

Structure and absolute stereochemistry of 19-epi-(+)-echitoveniline. A new indole alkaloid of the leaves of Alstonia venenata r.br.

Echitoserpine, a new 20-aroyloxy-16-methoxy vincadifformine alkaloid, has been isolated from the fruits of Alstonia venenata R.Br. and is shown to possess structure 1 on the basis of spectral and chemical evidence. © 1974.

Journal	Tetrahedron Letters
Publisher	-
ISSN	0040-4039