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Showing 1 to 20 of 26 for “"Amaryllidaceae"”.
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Systematic studies in the tribe Amaryllideae (Amaryllidaceae)
Systematic studies in the tribe Amaryllideae (Amaryllidaceae). D.A. Snijman, Compton Herbarium, National Botanical Institute, Private Bag X7, Claremont 7735, South Africa. The phylogeny of the African Amaryllideae is presented as a basis for classification and an enquiry into the tribe's evolution. …
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Morfologia de Amaryllidaceae S.S. nativas do Nordeste brasileiro
… por cerca de 60 gêneros e 850 espécies, Amaryllidaceae s.s. possui ampla distribuição geográfica. No Brasil ocorrem aproximadamente 15 gêneros e um número estimado de 150 espécies, das quais cerca de 30 nomes foram propostos como nativas da região nordeste. Visando colaborar para o …
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A study of the alkaloids of Narcissus pseudonarcissus, Amaryllidaceae
… the common daffodil, Narcissus pseudonarcissus, Amaryllidaceae. The literature consulted does not shed much light on the mechanisms of the toxic agent or agents, and there appear to be some inconsistencies in respect to the alkaloids extracted. Part of this may be the result of differences in …
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Evolution of floral morphology in Brunsvigia and Crossyne (Amaryllidaceae)
… for the genera Brunsvigia and Crossyne (Amaryllidaceae). These two genera have similar vegetative morphologies and share the same mode of seed dispersal (anemogeochory). They differ in their floral and inflorescence structures. The species Brunsvigia bosmaniae and Crossyne flava are …
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Molecular systematics, biogeography and dating of the tribe Haemantheae (Amaryllidaceae) and the phylogeography of Clivia
… belonging to the monocotyledonous family Amaryllidaceae, comprises six genera (Gethyllis, Apodolirion, Haemanthus, Scadoxus, Clivia and Cryptostephanus) with ca. 90 species. A phylogenetic hypothesis for the Haemantheae is presented as a basis for an enquiry into the generic and species …
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Effect of desiccation and storage on the seeds of two related species in the Amaryllidaceae from the western Cape Province
… Barker ex Snijman and Amaryllis belladonna L. (Amaryllidaceae) were studied to determine whether these seeds are indeed recalcitrant, and if so their degree of tolerance, and to gain an understanding of the reproductive strategies of these species through their seeds behaviour. Seeds were stored …
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Total synthesis of lycoricidine via photochemical dearomative dihydroxylation
Lycoricidine a member of the amaryllidaceae isocarbostyril alkaloid family of natural products isolated from bulbs of plants in the amaryllidaceae family, which include the common daffodil. The compound has been demonstrated to possess significant biological activity against a wide range of cancer …
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Využití technik hmotností spektrometrie v analýze přírodních látek
… of alkaloids in individual genera of the family Amaryllidaceae. The introduction to the theoretical part summarizes the analyzes gas chromatography (GC). Alkaloids have been classified according to their heterocyclic parts and the family Amaryllidaceae has been described. The work was based on …
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Synthesis of unnatural analogues of pancratistatin and narciclasine
… different types of unnatural analogues of Amaryllidaceae constituents. Development and refinement of existing and design and execution of new approaches towards the synthesis of C-1 analogues of pancratistatin and A-ring heterocyclic analogues of narciclasine are discussed. Evaluation of …
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Variation in pollination across a fragmented landscape at the Cape of Africa
… in the pollination of Brunsvigia orientalis (Amaryllidaceae) by Nectarinia sunbirds.
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Chemistry of oxa- and aza-bicyclic(4.1.0)heptenes, total synthesis of (+)-pancratistatin
… as useful new synthons for C-disaccharides and Amaryllidaceae alkaloid syntheses. The utility of synthon 7b has been demonstrated by a concise enantiocontrolled synthesis of (+)-pancratistatin (9). The key step involved the S<sub>N</sub>2 opening of 7b with the aryl cyanocuprate derived from …
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Reactivity studies of arene-cis-diols in cycloadditions and potassium permanganate oxidations: synthesis of the corresponding arene-trans-diols and an approach to the synthesis of (+)-pancratistatin
… serve as intermediates in an approach to the amaryllidaceae alkaloid (+)-pancratistatin (12).
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Neurotropní a antioxidační aktivita vybraných druhů jednoděložných alkaloidních rostlin. IV.
… a alkaloidní extrakty z 6 druhů narcisů z čeledi Amaryllidaceae. Dále jejich proměření inhibiční aktivity vůči lidským cholinesterázám (HuAChE a HuBuChE). Na základě výsledků jednotlivých extraktů byla provedena identifikace alkaloidního spektra každého extraktu pomocí GC/MS analýzy za účelem …
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Investigation of metal mediated reactions for natural product synthesis
… these compounds for the total synthesis of the amaryllidaceae alkaloid (+)-gamma-lycorane was also investigated.
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Plantas de la región como fuente potencial de metabolitos secundarios inhibidores de colinesterasa
… los extractos de H. jamesonii y H. tubispathus (Amaryllidaceae), fue posible la identificación de quince alcaloides mediante CG-EM. De H. tubispathus se logró además, el aislamiento de tres alcaloides mayoritarios: hippeastidina (6), licorina (8), y 3-O-demetilhippeastidina (16), constituyendo el …
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A Morphological and Phylogenetic Comparative approach to investigating Branching Architecture Evolution in Monocots A Dissertation
… the monocot umbel found in the Amaryllis family (Amaryllidaceae). Overall, this research produced a framework that can broadly be applied to the study of other organisms in order to explore more mechanistic-based explanations for how macroevolution took place.
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I. Synthesis of Ascarosides for Biological Evaluation and II. Development of Visible Light-Promoted Selenofunctionalization and Grafting of Aryl Iodides
… of substrates, including the total synthesis of Amaryllidaceae alkaloid, γ-lycorane, is accomplished in excellent yields. Chapter 4 describes the formation of an organic thin film using photocatalysis and aryl iodides. Most commonly, organic thin films are generated using thiol precursors. …
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Total synthesis enabled by nickel-catalyzed transformations: Dearomative carboamination and methylenecyclopropane annulation
… a divergent synthetic platform to access all the Amaryllidaceae alkaloids using a novel nickel-catalyzed asymmetric dearomative carboamination reaction. This strategy relies on the ability of N-methyl-1,2,4-triazoline-3,5-dione (MTAD) to undergo a [4+2] cycloaddition with benzene to form an …
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Dearomative transformations in synthesis: I. Dearomative dihydroxylation with arenophiles II. Total synthesis of lycoricidine and narciclasine III. Towards the total synthesis of collybolide
… synthesis of lycoricidine and narciclasine, two Amaryllidaceae alkaloids with potent anti-cancer activity. Through the application of a Narasaka variant of our dearomative dihydroxylation reaction and a key Suzuki reaction, we have enabled concise access to a key intermediate encompassing all of …
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