A Biomimetic Total Synthesis of the Alkaloid Gracilamine

A Biomimetic Total Synthesis of the Alkaloid Gracilamine
Author: Yuqian Gao
Publisher:
Total Pages: 0
Release: 2018
Genre:
ISBN:

In 2005 Ünver and Kaya reported that ethanolic extraction of the dried and powdered total plant material derived from Galanthus gracilis, a Turkish member of the Amaryllidaceae family, lead to the isolation of gracilamine and to which the unprecedented structure 1.1 was assigned on the basis of extensive NMR spectroscopic and mass spectrometric analyses. This compound represents the first example of a pentacyclic dinitrogenous alkaloid isolated from the Amaryllidaceae family. It embodies five rings and seven stereocentres. The ethyl ester moiety associated with compound 1.1 is almost certainly an artifact of the isolation process, the naturally occurring alkaloid presumably being either another ester or the corresponding free acid. This rather complex structure together with the author's previous [BSc(Hons.)] studies made its total synthesis a topic of considerable interest. Chapter One provides a brief introduction to the isolation, structural elucidation, proposed biogenesis, and previous total syntheses of gracilamine. It also details earlier relevant work carried out by the author. Chapter Two details a model study involving a Pd-catalysed intramolecular Alder-ene (IMAE) reaction that delivers a substrate used for testing the crucial intramolecular [3+2]cycloaddition process. By such means the basic framework, 2.24, of gracilamine was established. Chapter Three outlines the difficulties encountered in efforts to extend the abovementioned model studies in establishing a total synthesis of gracilamine. Despite this, one of these "difficulties" could be parlayed in the establishment of a ten-step total synthesis of the racemic modification of the alkaloid (±)-3-O-demethylmacronine (1.68). Chapter Four details the completion of a total synthesis of gracilamine. The final route proceeded in just eleven steps and so representing the shortest route to the title alkaloid reported thus far in this active area of research. Chapter Five presents the experimental procedures and data underpinning all of the work and conclusions detailed in Chapters Two, Three and Four.

Synthetic Approaches to Nonaromatic Nitrogen Heterocycles, 2 Volume Set

Synthetic Approaches to Nonaromatic Nitrogen Heterocycles, 2 Volume Set
Author: Ana Maria Faisca Phillips
Publisher: John Wiley & Sons
Total Pages: 1370
Release: 2020-11-17
Genre: Science
ISBN: 1119708796

A comprehensive overview of synthetic strategies for nonaromatic nitrogen heterocycles Nitrogen heterocycles are extremely widely distributed in nature, as well as in synthetic substances found in pharmaceuticals, agrochemicals, and materials chemistry. With new structures and medicines that include these structures emerging yearly, and a vast new journal literature to describe them, anyone who wants to be effective in R&D needs to easily access a synthesis of the latest research. This state-of-the-art survey explores recent developments in the most widely used reactions, as well as completely new ones. Highlights the major modern synthetic methods known to obtain nonaromatic nitrogen heterocycles, and their practical applications Topics include enantioselective synthesis and catalysis, photocatalysis, biocatalysis, microwave-assisted synthesis, reactions of oximes and nitrones, and ionic liquids Discusses how to synthesize rings of specific sizes Covers sustainable synthetic approaches for obtaining salts Whether you are using nonaromatic nitrogen compounds as an academic researcher, a synthetic chemist in industry, or an advanced student, this book is an essential, up-to-date resource to support your work.

Alkaloid Synthesis

Alkaloid Synthesis
Author: Hans-Joachim Knoelker
Publisher: Springer Science & Business Media
Total Pages: 268
Release: 2012-01-13
Genre: Science
ISBN: 3642255280

Lycopodium Alkaloids: Isolation and Asymmetric Synthesis, by Mariko Kitajima and Hiromitsu Takayama.- Synthesis of Morphine Alkaloids and Derivatives, by Uwe Rinner and Tomas Hudlicky.- Indole Prenylation in Alkaloid Synthesis, by Thomas Lindel, Nils Marsch and Santosh Kumar Adla.- Marine Pyrroloiminoquinone Alkaloids, by Yasuyuki Kita and Hiromichi Fujioka.- Synthetic Studies on Amaryllidaceae and Other Terrestrially Derived Alkaloids, by Martin G. Banwell, Nadia Yuqian Gao, Brett D. Schwartz and Lorenzo V. White.- Synthesis of Pyrrole and Carbazole Alkaloids, by Ingmar Bauer and Hans-Joachim Knölker.-

Biomimetic Organic Synthesis

Biomimetic Organic Synthesis
Author: Erwan Poupon
Publisher: John Wiley & Sons
Total Pages: 1024
Release: 2011-05-09
Genre: Science
ISBN: 3527634762

In this exciting 2 volume set, the approach and methodology of bio-inspired synthesis of complex natural products is laid out, backed by abundant practical examples from the authors' own work as well as from the published literature. Volume 1 describes the biomimetic synthesis of alkaloids. Volume 2 covers terpenes, polyketides, and polyphenols. A discussion of the current challenges and frontiers in biomimetic synthesis concludes this comprehensive handbook. Key features: Biomimetic Strategies have become an every-day tool not only for chemists but also for biologists. The synthetic applications are overwhelming, making this comprehensive 2 volume work a must-have for everyone working in the field. Unifying both synthetic and biosynthetic aspects, this book covers everything from organocatalysis and natural product synthesis to synthetic biology and even green chemistry.

Lead Compounds from Medicinal Plants for the Treatment of Neurodegenerative Diseases

Lead Compounds from Medicinal Plants for the Treatment of Neurodegenerative Diseases
Author: Christophe Wiart
Publisher: Academic Press
Total Pages: 415
Release: 2013-12-16
Genre: Medical
ISBN: 0123983835

Lead Compounds from Medicinal Plants for the Treatment of Neurodegenerative Diseases is the second volume in the series, Pharmaceutical Leads from Medicinal Plants. This book includes key pharmacological and chemical evidence to support the selection of promising pre-clinical candidates for the treatment of neurodegenerative diseases. This important addition to the natural product and drug discovery literature contains the history, synonyms, medicinal uses, phytopharmacology, pre-clinical potential, and rationale for each plant selected. By providing critical evaluation of pharmacological data, mechanisms of action, and structural requirements for the development of future neuroprotective agents, this comprehensive reference is a beneficial resource for industry and academic scientists whose research focuses on neurodegenerative drug discovery and development. - Incorporates compelling biological activity data and preclinical structure-activity relationships to help you choose promising lead molecules for further research - Includes primary source references to the most recent natural product discoveries in the field of neuroprotection in order to promote new drug discovery in this area - Contains detailed discussions of important neurodegenerative diseases, including Alzheimer's disease and Parkinson's disease - Each plant section includes a critical evaluation of pharmacological, chemical, and toxicological evidence to support the use of the compound in drug discovery research in neurodegeneration

Asymmetric Organocatalysis Combined with Metal Catalysis

Asymmetric Organocatalysis Combined with Metal Catalysis
Author: Bruce A. Arndtsen
Publisher: Springer Nature
Total Pages: 211
Release: 2020-04-24
Genre: Science
ISBN: 3030438511

The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience.Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.The chapter "Enamine/Transition Metal Combined Catalysis: Catalytic Transformations Involving Organometallic Electrophilic Intermediates" is available open access under a CC BY 4.0 License via link.springer.com.

Alkaloids

Alkaloids
Author: Margaret F. Roberts
Publisher: Springer Science & Business Media
Total Pages: 492
Release: 2013-04-17
Genre: Science
ISBN: 1475729057

Not since the late 1970s has a single work presented the biology of this heterogenous group of secondary alkaloids in such depth. Alkaloids, a unique treatise featuring leaders in the field, presents both the historical use of alkaloids and the latest discoveries in the biochemistry of alkaloid production in plants alkaloid ecology, including marine invertebrates, animal and plant parasites, and alkaloids as antimicrobial and current medicinal use . Highlights include chapters on the chemical ecology of alkaloids in host-predator interactions, and on the compartmentation of alkaloids synthesis, transport, and storage. Extensive cross-referencing in tabular format makes this volume an excellent reference.

Total Synthesis of Natural Products

Total Synthesis of Natural Products
Author: Jie Jack Li
Publisher: Springer Science & Business Media
Total Pages: 292
Release: 2013-03-14
Genre: Science
ISBN: 3642340652

'Total Synthesis of Natural Products' is written and edited by some of today's leaders in organic chemistry. Eleven chapters cover a range of natural products, from steroids to alkaloids. Each chapter contains an introduction to the natural product in question, descriptions of its biological and pharmacological properties and outlines of total synthesis procedures already carried out. Particular emphasis is placed on novel methodologies developed by the respective authors and their research groups. This text is ideal for graduate and advanced undergraduate students, as well as organic chemists in academia and industry.

Nitroalkanes

Nitroalkanes
Author: Roberto Ballini
Publisher: John Wiley & Sons
Total Pages: 322
Release: 2021-04-26
Genre: Science
ISBN: 3527347453

Discover a comprehensive exploration of recent progress in the preparation of nitroalkanes from two leading voices in the field Nitroalkanes: Synthesis, Reactivity, and Applications delivers a thorough summary of the importance of nitroalkanes in organic synthesis. The book covers their preparation, transformation into other functional groups, like carbonyls and amines, and their use in the formation of single carbon-carbon or double carbon-carbon bonds. The distinguished authors have included chapters on acyclic and cyclic alpha-nitro ketones as well as the synthesis of cyclopropanes and spiro ketals. The book provides treatments of the application of nitroalkanes for the synthesis of important heterocycles, poly-functionalized structures, natural products, and compounds of biological and pharmaceutical interest. A one-stop resource in a topic that hasn???t been fully addressed by any other book in decades, this book covers the most important synthetic routes toward nitroalkanes. Readers will also benefit from the inclusion of: A thorough introduction to the synthesis of nitroalkanes, as well as the transformation of the nitro group into other functionalities An exploration of the formation of C-C single bonds, C=C double bonds, and the breaking of C3C bonds from cyclic alpha-nitro ketones Discussions of acyclic alpha-nitro ketones, nitroalkanes as precursors of cyclopropanes, and the synthesis of spiro ketals An examination of the preparation and synthetic applications of 1,3-Dinitroalkanes Perfect for organic chemists, natural products chemists, and catalytic chemists, Nitroalkanes: Synthesis, Reactivity, and Applications will also earn a place in the libraries of medicinal chemists seeking a one-stop resource for the most recent developments in the preparation of nitroalkanes, their functionalization, and their applications.