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Author : Christiana Nicole Teijaro
Publisher :
ISBN 13 :
Total Pages : 325 pages
Book Rating : 4.:/5 (128 download)
Download or read book Synthetic Approaches to Strychnos and Bis-aspidosperma Alkaloids written by Christiana Nicole Teijaro and published by . This book was released on 2017 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gopal Sirasani
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128056045
Total Pages : 39 pages
Book Rating : 4.1/5 (28 download)
Download or read book Strategies and Tactics in Organic Synthesis written by Gopal Sirasani and published by Elsevier Inc. Chapters. This book was released on 2013-07-29 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Described herein is an account of my laboratory’s entry into the magnificent field of complex alkaloid total synthesis, spanning the development of novel methods for quickly assembling polycyclic frameworks through the total synthesis of various members of the Strychnos alkaloids. A discussion of the prior art related to our approach to these alkaloids in addition to strategic decisions and reasoning made en route to targets akuammicine ( 1 ), strychnine ( 2 ), and leuconicines A ( 3 ) and B ( 4 ) is carefully detailed. Finally, we present the retrosynthetic analyses of the aforementioned targets and respective total syntheses thereof (including asymmetric variants).
Author : Senzhi Zhao
Publisher :
ISBN 13 :
Total Pages : 363 pages
Book Rating : 4.:/5 (128 download)
Download or read book NOVEL APPROACHES TO STRYCHNOS AND ASPIDOSPERMA ALKALOIDS written by Senzhi Zhao and published by . This book was released on 2015 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: All Strychnos and Aspidosperma alkaloids possess a core pyrrolo[2,3-d]carbazole ABCE tetracycle. In order to develop an efficient and divergent methodology for the synthesis of Strychnos alkaloids, a streamlined synthetic sequence to the ABCE tetracycle has been developed. It features a Mitsunobu activation of an N-hydroxyethyl gramine intermediate and subsequent intramolecular aza-Baylis-Hillman reaction. This method was first applied in the total synthesis of (±)-alstolucine B. Additional key steps in the synthesis included (1) chemoselective intermolecular and intramolecular Michael additions and (2) a Swern indoline oxidation. The second application of this method was in the first total synthesis of (-)-melotenine A, a novel rearranged Aspidosperma alkaloid with potent biological activity. Additional key steps in the synthesis included (1) a Piers annulation of a vinyl iodide and a methyl ketone to prepare the D ring and (2) a site-selective intermolecular vinylogous aldol reaction.
Author : Praveen Kokkonda
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (128 download)
Download or read book TOTAL SYNTHESIS OF STRYCHNOS AND ASPIDOSPERMATAN ALKALOIDS written by Praveen Kokkonda and published by . This book was released on 2017 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Strychnos class of indole alkaloids contain a pyrrolo[2,3-d]carbazole ABCE tetracyclic framework. The second-generation ABCE tetracycle approach was employed in the total synthesis of (±)-20-epi-lochneridine and progress toward total synthesis of (±)-alstolucine B. The second-generation approach featured Mitsunobu activation of the hydroxyethyl group in a gramine intermediate followed by intramolecular aza-Baylis-Hillman reaction. The substrate for hydroboration was redesigned to (±)-18-desmethyl akuammicine (1,1-disubstituted double bond), since the hydroboration of trisubstituted alkenes afforded tertiary alcohol via Markovnikov addition. The key steps were n-Bu3SnH mediated cyclization reaction to accomplish D-ring, tert-butyl hypochlorite indoline oxidation, and anti-Markovnikov hydroboration to introduce a primary alcohol. The total syntheses of Strychnos-Strychnos type bis-indole alkaloids (−)-leucoridine A and C were accomplished from the biomimetic dimerization of (−)-dihydrovalparicine. En route to (−)-dihydrovialparicine, known alkaloids (+)-geissoschizoline and (−)-dehydrogeissoschizoline were also prepared from commercially available N-tosyl indole 3-carboxaldehyde. Key steps consisted of an in situ dimerization of (−)-dihydrovalparicine from (−)-1, 2-dehydrogeissoschizoline with trifluoroacetic acid in the presence of 4 Å molecular sieves. Acid mediated ring-opening of the indolenine in (−)-leucoridine A to afford (−)-leucoridine C. DFT calculations were employed to elucidate the mechanism of dimerization, which suggested that a stepwise aza-Michael/spirocyclization sequence was preferred over the alternate hetero Diels-Alder cycloaddition reaction. A novel domino Michael/Mannich [4+2] annulation method was applied for concise total synthesis of Aspidospermatan alkaloids (+)-20-epi-condyfoline and progress toward the total synthesis of (+)-condyfoline. The additional key steps consisted of a LiHMDS mediated cyclization to form D-ring, dimethyl(methylthio)sulfonium tetrafluoroborate (DMTSF) mediated spirocyclization to form pentacyclic thioether and indoline oxidation with MnO2.
Author : Rack Hun Chung
Publisher :
ISBN 13 :
Total Pages : 294 pages
Book Rating : 4.:/5 (418 download)
Download or read book Synthetic Approaches to the Alkaloids of the Strychnos Family written by Rack Hun Chung and published by . This book was released on 1972 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert Ian West
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (6 download)
Download or read book Synthetic Approaches to Strychnos Alkaloids written by Robert Ian West and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Clive Stuart Penkett
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (535 download)
Download or read book Novel Synthetic Approaches to Strychnos Alkaloids written by Clive Stuart Penkett and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael Harmata
Publisher : Academic Press
ISBN 13 : 0124058558
Total Pages : 345 pages
Book Rating : 4.1/5 (24 download)
Download or read book Strategies and Tactics in Organic Synthesis written by Michael Harmata and published by Academic Press. This book was released on 2013-07-29 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: A classic in the area of organic synthesis, Strategies and Tactics in Organic Synthesis provides a forum for investigators to discuss their approach to the science and art of organic synthesis. Rather than a simple presentation of data or a secondhand analysis, we are given stories that vividly demonstrate the power of the human endeavor known as organic synthesis and the creativity and tenacity of its practitioners. Firsthand accounts of each project tell of the excitement of conception, the frustration of failure and the joy experienced when either rational thought or good fortune gives rise to the successful completion of a project. This book series shows how synthesis is really done, and we are educated, challenged and inspired by these accounts, which portray the idea that triumphs do not come without challenges. We also learn that we can meet challenges to further advance the science and art of organic synthesis, driving it forward to meet the demands of society, in discovering new reactions, creating new designs and building molecules with atom and step economies that provide solutions through function to create a better world. - Presents state-of-the-art developments in organic synthesis - Provides insight and offers new perspective to problem-solving - Written by leading experts in the field
Author : Jie Jack Li
Publisher : Springer Science & Business Media
ISBN 13 : 3642340652
Total Pages : 292 pages
Book Rating : 4.6/5 (423 download)
Download or read book Total Synthesis of Natural Products written by Jie Jack Li and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: '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.
Author : Kengadarane Anebouselvy
Publisher : Royal Society of Chemistry
ISBN 13 : 1782620907
Total Pages : 220 pages
Book Rating : 4.7/5 (826 download)
Download or read book Dienamine Catalysis for Organic Synthesis written by Kengadarane Anebouselvy and published by Royal Society of Chemistry. This book was released on 2018-03-02 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decade a new era in asymmetric catalysis has been realised by the discovery of L-proline induced chiral enamines from carbonyls. Inspired by this, researchers have developed many other primary catalytic species in situ, more recently secondary catalytic species such as aminals have been identified for use in asymmetric synthesis. High-yielding asymmetric synthesis of bioactive and natural products through mild catalysis is an efficient approach in reaction engineering. In the early days, synthetic chemists mainly focused on the synthesis of complex molecules, with less attention on the reaction efficiency and eco-friendly conditions. Recent investigations have been directed towards the development of atom economy, eco-friendly and enantioselective synthesis for more targeted and efficient synthesis. Building on the momentum of this rapidly expanding research area, Dienamine catalysis for organic synthesis will provide a comprehensive introduction, from the preformed species, in situ generation and onto their applications in the synthesis of bioactive molecules and natural products.
Author : Victor Kuete
Publisher : Newnes
ISBN 13 : 0124059368
Total Pages : 917 pages
Book Rating : 4.1/5 (24 download)
Download or read book Medicinal Plant Research in Africa written by Victor Kuete and published by Newnes. This book was released on 2013-06-19 with total page 917 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pharmacopoeias of most African countries are available and contain an impressive number of medicinal plants used for various therapeutic purposes. Many African scholars have distinguished themselves in the fields of organic chemistry, pharmacology, and pharmacognosy and other areas related to the study of plant medicinal plants. However, until now, there is no global standard book on the nature and specificity of chemicals isolated in African medicinal plants, as well as a book bringing together and discussing the main bioactive metabolites of these plants. This book explores the essence of natural substances from African medicinal plants and their pharmacological potential. In light of possible academic use, this book also scans the bulk of African medicinal plants extract having promising pharmacological activities. - The book contains data of biologically active plants of Africa, plant occurring compounds and synthesis pathways of secondary metabolites - This book explores the essence of natural substances from African medicinal plants and their pharmacological potential - The authors are world reknowned African Scientists
Author : Gordon W. Gribble
Publisher : John Wiley & Sons
ISBN 13 : 0470512180
Total Pages : 704 pages
Book Rating : 4.4/5 (75 download)
Download or read book Indole Ring Synthesis written by Gordon W. Gribble and published by John Wiley & Sons. This book was released on 2016-08-08 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of the myriad of heterocycles known to man, the indole ring stands foremost for its remarkably versatile chemistry, its enormous range of biological activities, and its ubiquity in the terrestrial and marine environments. The indole ring continues to be discovered in natural products and to be employed in man-made pharmaceuticals and other materials. Given the enormous resurgence in indole ring synthesis over the past decade — highlighted by the power of transition metal catalysis — this authoritative guide addresses the need for a comprehensive presentation of the myriad of methods for constructing the indole ring, from the ancient to the modern, and from the obscure to the well-known. Following presentation of the classic indole ring syntheses and many newer methods, coverage continues with indole ring syntheses via pyrroles, indolines, oxindoles, isatins, radical and photochemical reactions, aryne cycloadditions. This extensive volume concludes with the modern transition metal–catalyzed indole ring syntheses that utilize copper, palladium, rhodium, gold, ruthenium, platinum, and other metals to fashion the indole ring Indole Ring Synthesis is a comprehensive, authoritative and up-to-date guide to the synthesis of this important heterocycle for organic chemists, pharmaceutical researchers and those interested in the chemistry of natural products.
Author : Bela Torok
Publisher : Elsevier
ISBN 13 : 0128190159
Total Pages : 606 pages
Book Rating : 4.1/5 (281 download)
Download or read book Nontraditional Activation Methods in Green and Sustainable Applications written by Bela Torok and published by Elsevier. This book was released on 2021-02-25 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nontraditional Activation Methods in Green and Sustainable Applications: Microwaves; Ultrasounds; Photo-, Electro- and Mechan-ochemistry and High Hydrostatic Pressure provides a broad overview of non-traditional activation methods to help readers identify and use appropriate approaches in reducing the environmental impact of their work. Sections discuss the fundamental principles of each method and provide examples of their practical use, illustrating their usefulness. Given the importance of expanding laboratory based technologies to the industrial level, chapters that cover both existing and potential industrial and environmental applications are also included. Highlighting the usefulness and adaptability of these methods for a range of practical applications, this book is a practical guide for both those involved with the design and application of synthetic methodologies and those interested in the implementation and impact of green chemistry principles in practice, from synthetic and medicinal chemists, to food developers and environmental policy planners. Discusses, and critically assesses, the advantages of non-traditional activation methods in green and sustainable chemistry applications Features individual chapters written by renowned experts in the field Contains extensive, state-of-the-art reference sections, providing critically filtered information to readers
Author : Hans-Joachim Knolker
Publisher : Academic Press
ISBN 13 : 0323858910
Total Pages : 380 pages
Book Rating : 4.3/5 (238 download)
Download or read book The Alkaloids written by Hans-Joachim Knolker and published by Academic Press. This book was released on 2021-09-24 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Alkaloids, Volume 86, is the newest release in a series that has covered the topic for more than 60 years. As the esteemed, leading reference in the field of alkaloid chemistry, this series covers all aspects of alkaloids, including their chemistry, biology and pharmacology. Sections are presented as high-quality, timeless reviews written by renowned experts in the field. Provides the latest information on the study of alkaloids Covers their chemistry, biology, pharmacology and medical applications Contains more than 70 published volumes in this interesting field of study
Author : Tadeusz Aniszewski
Publisher : Elsevier
ISBN 13 : 0080475337
Total Pages : 325 pages
Book Rating : 4.0/5 (84 download)
Download or read book Alkaloids - Secrets of Life: written by Tadeusz Aniszewski and published by Elsevier. This book was released on 2007-03-22 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alkaloids, represent a group of interesting and complex chemical compounds, produced by the secondary metabolism of living organisms in different biotopes. They are relatively common chemicals in all kingdoms of living organisms in all environments. Two hundred years of scientific research has still not fully explained the connections between alkaloids and life.Alkaloids-Chemistry, Biological Significance, Applications and Ecological Role provides knowledge on structural typology, biosynthesis and metabolism in relation to recent research work on alkaloids. Considering an organic chemistry approach to alkaloids using biological and ecological explanation. Within the book several questions that persist in this field of research are approached as are some unresearched areas. The book provides beneficial text for an academic and professional audience and serves as a source of knowledge for anyone who is interested in the fascinating subject of alkaloids. Each chapter features an abstract. Appendices are included, as are a listing of alkaloids, plants containing alkaloids and some basic protocols of alkaloid analysis.* Presents the ecological role of alkaloids in nature and ecosystems * Interdisciplinary and reader friendly approach* Up-to-date knowledge
Author : K. C. Nicolaou
Publisher : John Wiley & Sons
ISBN 13 : 3527292314
Total Pages : 826 pages
Book Rating : 4.5/5 (272 download)
Download or read book Classics in Total Synthesis written by K. C. Nicolaou and published by John Wiley & Sons. This book was released on 1996-04-11 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: K.C. Nicolaou - Winner of the Nemitsas Prize 2014 in Chemistry This book is a must for every synthetic chemist. With didactic skill and clarity, K. C. Nicolaou and E. Sorensen present the most remarkable and ingenious total syntheses from outstanding synthetic organic chemists. To make the complex strategies more accessible, especially to the novice, each total synthesis is analyzed retrosynthetically. The authors then carefully explain each synthetic step and give hints on alternative methods and potential pitfalls. Numerous references to useful reviews and the original literature make this book an indispensable source of further information. Special emphasis is placed on the skillful use of graphics and schemes: Retrosynthetic analyses, reaction sequences, and stereochemically crucial steps are presented in boxed sections within the text. For easy reference, key intermediates are also shown in the margins. Graduate students and researchers alike will find this book a gold mine of useful information essential for their daily work. Every synthetic organic chemist will want to have a copy on his or her desk.
Author : Andrei Hent
Publisher : Academic Press
ISBN 13 : 0128128704
Total Pages : 886 pages
Book Rating : 4.1/5 (281 download)
Download or read book Strategies and Solutions to Advanced Organic Reaction Mechanisms written by Andrei Hent and published by Academic Press. This book was released on 2019-06-28 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strategies and Solutions to Advanced Organic Reaction Mechanisms: A New Perspective on McKillop's Problems builds upon Alexander (Sandy) McKillop's popular text, Solutions to McKillop's Advanced Problems in Organic Reaction Mechanisms, providing a unified methodological approach to dealing with problems of organic reaction mechanism. This unique book outlines the logic, experimental insight and problem-solving strategy approaches available when dealing with problems of organic reaction mechanism. These valuable methods emphasize a structured and widely applicable approach relevant for both students and experts in the field. By using the methods described, advanced students and researchers alike will be able to tackle problems in organic reaction mechanism, from the simple and straight forward to the advanced. - Provides strategic methods for solving advanced mechanistic problems and applies those techniques to the 300 original problems in the first publication - Replaces reliance on memorization with the understanding brought by pattern recognition to new problems - Supplements worked examples with synthesis strategy, green metrics analysis and novel research, where available, to help advanced students and researchers in choosing their next research project
