Results 161 to 170 of about 4,714 (210)

Alkaloids from Narcissus angustifolius subsp. transcarpathicus (Amaryllidaceae)

Phytochemistry, 2002
Seven alkaloids have been isolated from fresh bulbs of Narcissus angustifolius subsp. transcarpathicus (Amaryllidaceae). Nangustine, reported here for the first time, is the first 5,11-methanomorphanthridine alkaloid with a C-3/C-4 substitution. The structure and stereochemistry of this new alkaloid, as well as those previously known, have been ...
Machocho, Alex K., Labranya, J., Kricsfalusy, V., Brun, R., Codina, C., Viladomat., F, Bastida, J.   +6 more
openaire   +2 more sources

Amaryllidaceae alkaloids: Absolute configuration and biological activity

Chirality, 2017
AbstractPlants belonging to the Amaryllidaceae family are well known for their ornamental and medicinal use. Plant members of this group are distributed through both tropical and subtropical regions of the world and are dominant in Andean South America, the Mediterranean basin, and southern Africa.
Alessio Cimmino, Marco Masi, Marco Evidente, Stefano Superchi, Antonio Evidente   +4 more
openaire   +4 more sources

ChemInform Abstract: The Amaryllidaceae Alkaloids

ChemInform, 1998
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
openaire   +1 more source

Four new Amaryllidaceae alkaloids from Zephyranthes candida

Journal of Natural Medicines, 2014
Four new Amaryllidaceae alkaloids (1-4) possessing a homolycorine-type or a crinine-type skeleton have been isolated from the aerial part of Zephyranthes candida, and their structures were elucidated on the basis of spectroscopic data. The stereochemistry was elucidated by combination of NOESY correlations and CD analyses.
Nanase, Shitara, Yusuke, Hirasawa, Shunsuke, Hasumi, Tadahiro, Sasaki, Misaki, Matsumoto, Chin Piow, Wong, Toshio, Kaneda, Yoshinori, Asakawa, Hiroshi, Morita   +8 more
openaire   +2 more sources

Cell cycle modulatory effects of Amaryllidaceae alkaloids

Life Sciences, 2018
The birth, growth, proliferation and death of cells involve a rigorous and continuous process in place to ensure the survival of living organisms. The cell cycle prevails at the core of this process to facilitate the division of a parent cell as well as the duplication of its genetic matter. Although checkpoints exist to steer the course of a cell from
Jerald J. Nair, Johannes van Staden
openaire   +2 more sources

A Synthesis of the Amaryllidaceae Alkaloid Pratosine

Journal of Natural Products, 1996
A synthesis of pratosine by thermolysis of the Michael adduct obtained from 5-hydroxy-8,9-dimethoxy-6(5H)-phenanthridone and methyl propiolate is described.
M M, Pereira, S, Prabhakar, A M, Lobo
openaire   +2 more sources

Acetylcholinesterase Enzyme Inhibitory Effects of Amaryllidaceae Alkaloids

Planta Medica, 2004
Twenty-three Amaryllidaceae alkaloids having several different ring types were evaluated for their acetylcholinesterase enzyme (AChE) inhibitory activity. The alkaloid 1- O-acetyllycorine (IC50 : 0.96 +/- 0.04) showed significant AChE inhibitory activity.
Esameldin E, Elgorashi, Gary I, Stafford, Johannes, Van Staden   +2 more
openaire   +2 more sources

Alkaloids from Hippeastrum morelianum Lem. (Amaryllidaceae)

Magnetic Resonance in Chemistry, 2011
AbstractThe Amaryllidaceae family has proven to be a rich source of active molecules. As part of an ongoing project, we report a phytochemical study of Hippeastrum morelianum (Amaryllidaceae), from which we have isolated two homolycorine‐type alkaloids, the new 2α,7‐dimethoxyhomolycorine (1) and the poorly described candimine (2), as well as six known ...
Raquel B, Giordani, Jean P, de Andrade, Hugo, Verli, Julie H, Dutilh, Amélia T, Henriques, Strahil, Berkov, Jaume, Bastida, José Angelo S, Zuanazzi   +7 more
openaire   +2 more sources

Alkaloids and triterpenoids from Ammocharis coranica (Amaryllidaceae)

Phytochemistry, 2000
The bulbs of Ammocharis coranica yielded eight alkaloids: lycorine, acetylcaranine and crinamine, which have been reported previously from A. coranica, 1-O-acetyllycorine, hippadine, 6 alpha-hydroxypowelline and hamayne, which have been reported from other members of the Amaryllidaceae, 1-O-acetyl-9-O-demethylpuviine, which has not been described ...
N, Koorbanally, D A, Mulholland, N, Crouch   +2 more
openaire   +2 more sources

Amaryllidaceae Alkaloids and Colchicine

1968
About one hundred alkaloids are known from the family Amaryllidaceae. In their route of biosynthesis they bear several resemblances to the morphine alkaloids. In each type there are two six-membered rings derived from aromatic amino acids; and the additional ring closures are apparently produced by a mechanism of phenolate free radical coupling.
openaire   +1 more source