Three unsaturated amides, designated brachystamides-C, D and E have been characterised from Piper brachystachyum Wall. Brachystamide-C, shown to be N-isobutyl-15-(3′,4′-methylenedioxyphenyl)-2E,4E,13E- pentadecatrienamide, was unusual in having a non-conjugated double bond. Piper retrofractum Vahl. yielded retrofractamide-D, which has been fully characterised. © 2002 Elsevier Science Ltd. All rights reserved.

A BANERJI

M SARKAR

R DATTA

P SENGUPTA

K ABRAHAM

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

Amides from Piper brachystachyum and Piper retrofractum.

Phytochemistry

Two new unsaturated amides, brachystamides-A and B, were isolated from the total above-ground parts of Piper brachystachyum. Brachystamide-A was shown to be N-isobutyl-15 (3′,4′-methylenedioxyphenyl) 2E,4E-pentadecadienamide from spectroscopic and chemical investigations. Brachystamide-B was N-isobutyl-15 (3′,4′-methylenedioxyphenyl) 2E,4E,14E-pentadecatrienamide. © 1983.

Two amides from piper Brachystachyum

Two new unsaturated amides, retrofractamides A and C, were isolated from the total above-ground parts of Piper retrofractum. Retrofractamide A was shown to be N-isobutyl-9(3′,4′-methylenedioxyphenyl)2E,4E,8E-nonatrienamide from spectroscopic and chemical investigations. The structure 6 for retrofractamide C was suggested from spectroscopic and chemical studies and was confirmed by a total stereoselective synthesis. The presence of sesamin and 3,4,5-trimethoxydihydrocinnamic acid as well as two higher homologues of retrofractamide A, viz. pipericide (retrofractamide B) and retrofractamide D was demonstrated. The synthesis of pipericide was also achieved. © 1985.

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ISSN	0031-9422