Download or read book Studies on the Synthesis of Marine Natural Product Zampanolide and Its Analogues written by Jingjing Wang and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Analogues of the Marine Natural Product Manzamine A and Biological Studies written by Yohan J. G. Boursereau and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Biologically Active Marine Natural Product Analogues written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural products have long been a source of inspiration for many drugs in human use. The Andersen lab examines compounds from marine sources that can be used as lead structures for drug discovery. Synthetic studies, structure-activity relationships (SAR) and biological findings of two such compounds are described in this thesis. The first is pelorol, a meroterpene isolated from a tropical sponge Dactylospongia elegans. Pelorol is a small molecule activator of SHIP 1, a phosphatase that is a negative regulator of the P13K pathway in hematopoetic cells. Using a synthetic route from a previous co-worker, Lu Yang, a series of SHIP 1 activating compounds based on pelorol were synthesized. These compounds were evaluated for selectivity, potency, and efficacy in a series of biological studies, leading to the discovery of 2.27 as a preclinical lead compound. Water-soluble prodrugs of the SHIP 1-activating compounds were also synthesized and their properties reported. The second compound examined is ceratamine A, an alkaloid isolated from the sponge Pseudoceratina sp. from Papua New Guinea. Ceratamines A and B are microtubule stabilizing antimitotic agents that may be useful in cancer chemotherapy. The core imidazo[4,5,d]azepine heterocycle of the ceratamines has no precedent among known synthetic or natural compounds. The relatively simple structure of the ceratamines and the novel antimitotic phenotype they generate makes them attractive targets. Desbromo ceratamine A (3.44) was synthesized by an efficient and scaleable route, confirming the structure of ceratamine A and validating the biological activity of the core pharmacophore. Synthetic efforts towards ceratamine A were ultimately thwarted by the inability to install the bromine atoms present in the natural product. A significant finding is that the bromine atoms in ceratamine A contribute significantly to the antimitotic potency of the compound necessitating a bioisosteric approach to more potent antimitotic ceratami.
Download or read book Synthesis of Biologically Active Marine Natural Product Analogues written by Matthew B. Nodwell and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Natural Products written by Alban R. Pereira and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Total Synthesis of Marine Natural Products written by Lee Wang and published by . This book was released on 2019 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: The total syntheses of two peptidic cytotoxins, micromide and lagunamide A was completed employing both solid phase and solution phase methods. Micromide was derived from an unknown species of marine cyanobacterium of the genus Symploca. Its synthesis was accomplished using both solid-phase and solution phase chemistry. Comparison of the synthetic and natural product's NMR spectra reveal that the reported structure of micromide was incorrect. Syntheses of multiple analogs of micromide was completed to resolve the discrepancies in the NMR spectra. The new data suggests that micromide requires a structural revision. Lagunamide A is a cyclic depsipeptide isolated from Moorea procudens. The peptide portion was achieved through solid phase peptide synthesis (SPPS) and the polyketide moiety was achieved using Kobayashi's vinylogous Mukaiyama aldol reaction (VMAR).
Download or read book Synthesis of Marine Natural Products written by K. F. Albizati and published by Springer Verlag. This book was released on 1992-01-01 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies Toward the Synthesis of Marine Natural Products Phormidolides B D written by Alejandro Gil Escolano and published by . This book was released on 2018 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine natural products (MNPs) are, undoubtedly, highly valuable starting points for drug-development programs. Generally, MNPs show a well-defined spatial orientation that have evolved for thousands of years to interact with their biological target and the special and unique conditions present in seas, lakes, oceans and rivers allow the biosynthesis of highly potent compunds. Nowadays, the processes to discover a new drug from MNPs are bio-assay guided, giving more importance to the biological results rather than to the molecular structure. After a molecular entity has shown to be biologically relevant the next step is to determine the structural and stereochemical information of such molecule. It is at this step where the project described in this doctoral thesis started. Phormidolides B, C and D (PM B-D) is a family of complex molecules that were isolated in 2010 by the pharmaceutical company Pharmamar S.A. during an expedition to collect samples in the Pemba Island (Madagascar). The extracts rendered a mixture of PM B-D that, once purified, were tested on an IC50 assay against three tumour cell lines. The results showed activity in the low micromolar range with a still unknown mechanism of action. After extensive HRMS, 1D-NMR and 2D-NMR techniques a possible structure was proposed. Following previous UB doctoral theses (Dr. Adriana Lorente and Dr. Janire Lamariano) this doctoral thesis describes, as a compendium of publications, several synthetic studies with the final objective of achieving a robust total synthesis to confirm the structural information of PM B-D by chemical synthesis. After a general introduction (Chapter 1), Chapter 2 (Org. Lett. 2015, 17, 6246.) describes an optimization for the synthesis of the macrocyclic core present in PM B-D. Chapter 3 (Chem. Eur. J. 2016, 21, 7033.) deals, for the first time, with the synthesis and introduction of the most challenging part of the molecule: the bromo-methoxy-diene (BMD) moiety present at the end of the polyhydroxylated chain. After this finding, Chapter 4 (Org. Lett., 2016, 18, 4485.) illustrates the enantioselective synthesis of the polyol chain present in Oscillariolide and Phormidolides, including the previously mentioned BMD moiety. Chapter 5 reports the preparation of the fatty acids present in PM C and D. Finally, after the previous synthetic optimizations, Chapter 6 describes the first synthetic approach for the construction of this large family of natural products using a highly convergent approach. Finally, as an annex a review article entitled "Role of the Nozaki-Hiayama-Kishi-Takai coupling in the synthesis of natural products" (Chem. Rev., 2017, 117, 8420.) is included to deeply explain the uses of this reaction used, as well, for the synthesis of phormidolide B-D. A section with the general conclusions extracted from this thesis is also included.
Download or read book Studies in Natural Products Chemistry written by Atta-ur Rahman and published by Elsevier. This book was released on 2021-07-21 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies in Natural Products Chemistry, Volume 70 covers the synthesis or testing and recording of the medicinal properties of natural products, providing cutting-edge accounts of fascinating developments in the isolation, structure elucidation, synthesis, biosynthesis and pharmacology of a diverse array of bioactive natural products. With the rapid developments in spectroscopic techniques and accompanying advances in high-throughput screening techniques, this book presents exciting opportunities in the field of new drug development to the pharmaceutical industry. Natural products in the plant and animal kingdom offer a huge diversity of chemical structures that are the result of biosynthetic processes that have been modulated over the millennia through genetic effects. Focuses on the chemistry of bioactive natural products Contains contributions by leading authorities in the field Presents sources of new pharmacophores
Download or read book Chemical Biology of Natural Products written by David J. Newman and published by CRC Press. This book was released on 2017-09-22 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical Biology of Natural Products This unique, long-awaited volume is designed to address contemporary aspects of natural product chemistry and its influence on biological systems, not solely on human interactions. The subjects covered include discovery, isolation and characterization, biosynthesis, biosynthetic engineering, pharmaceutical, and other applications of these compounds. Each chapter begins with a brief and simple introduction to the subject matter, and then proceeds to guide the reader towards the more contemporary, cutting-edge research in the field, with the contributing authors presenting current examples from their own work in order to exemplify key themes. Topics covered in the text include genome mining, heterologous expression, natural product synthesis, biosynthesis, glycosylation, chemical ecology, and therapeutic applications of natural products, both current and potential.
Download or read book Biology and Ecology of Pharmaceutical Marine Tunicates written by Ramasamy Santhanam and published by CRC Press. This book was released on 2019-10-10 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ocean is a source of unique natural products, mainly accumulated in living organisms. The c.4000 species of tunicates or sea squirts (Phylum, Chordata; Subphylum, Urochordata) are a high-potential yet under-studied source of bioactive compounds for pharmaceuticals. The secondary metabolites such as alkaloids isolated from these organisms have led to the discovery of an approved anti-tumor drug, anti-cancer drugs Yondelis® and Aplidin®, as well as many others in clinical trial. There is an urgent need for more research on the bioactive compounds of marine tunicates and better knowledge about the identification and biology of these species. This is the first focused book to meet this need. The taxonomy, common name, global distribution, habitat, diagnostic features and pharmaceutical compounds (along with their activities) of 165 key species of tunicates are given, with high-quality illustrations. Contributed by scientists of both Marine Biology and Pharmacy disciplines, this book will serve as a standard reference for researchers, teachers and students of Fisheries Science, Marine Biology, Life Sciences, Biotechnology, Natural Products, and Pharmacy, and as a valuable guide for pharmaceutical companies involved in the development of new drugs from marine organisms.
Download or read book Marine Natural Products written by Hiromasa Kiyota and published by Springer. This book was released on 2010-11-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bioactive Natural Products written by Goutam Brahmachari and published by John Wiley & Sons. This book was released on 2015-03-23 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ein multidisziplinärer Überblick über die aktuellen Themen und Zukunftstrends in der Erforschung von Naturstoffen mit Schwerpunkt auf pharmazeutischen und medizinischen Anwendungen.
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2002 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progress in Heterocyclic Chemistry written by Clementina M.M. Santos and published by Elsevier Inc. Chapters. This book was released on 2013-09-06 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review covers work published in the calendar year 2012. Novel reaction chemistry and new ring synthetic methods for pyrans, [1]benzopyrans, dihydro[1]benzopyrans (chromenes, chromans), [2]benzopyrans, dihydro[2]benzopyrans (isochromenes, isochromans), pyranones, coumarins, chromones, xanthenes, xanthones, thiopyrans, dioxins, dioxanes, trioxanes, tetraoxanes, dithianes, trithianes, and oxathianes are reviewed.
Download or read book Progress in Heterocyclic Chemistry written by and published by Newnes. This book was released on 2013-09-06 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in Heterocyclic Chemistry is an annual review series commissioned by the International Society of Heterocyclic Chemistry (ISHC). Volumes in the series contain both highlights of the previous year’s literature on heterocyclic chemistry and articles on new, developing topics of particular interest to heterocyclic chemists. The highlight chapters in Volume 25 are all written by leading researchers in their field, and these chapters constitute a systematic survey of the important original material reported in the literature of heterocyclic chemistry in 2012. As with previous volumes in the series, Volume 25 will enable academic and industrial chemists and advanced students to keep abreast of developments in heterocyclic chemistry in a convenient way. Recognized as the premiere review of heterocyclic chemistry Contributions from leading researchers in the field Systematic survey of the important 2012 heterocyclic chemistry literature
Download or read book Symbiotic Microbiomes of Coral Reefs Sponges and Corals written by Zhiyong Li and published by Springer. This book was released on 2019-06-07 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the symbiotic microbiomes of invertebrates in coral reefs, especially sponges and corals. It provides in-depth and up-to-date reviews on the microbial structure and diversity, metabolism and function, symbiosis and coevolution, environment and adaption, and bioactive potentials. Meanwhile, the future perspectives will be discussed according to the existing problems and the development trend. This book will be of particular interest to the professionals in marine ecology, marine biotechnology, as well as medicinal chemists and molecular biologists.
