Download or read book Total Synthesis of Indole Alkaloids written by Younggi Choi and published by . This book was released on 2003 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: PART I. The preparation of (-)-ibogamine (1) in fourteen steps from benzoquinone and in 10% overall yield is a powerful illustration of the value of the asymmetric Diels-Alder reaction as a starting point in a multistep synthesis. All four cycloadducts, 70, 77, 84 and 96, obtained with the (S)-BINOL-TiCl2 complex were found to have the same absolute configuration. Furthermore, they are in the same enantiomeric series that Mikami observed with 1,4-naphthoquinone using the same catalyst, lending confidence to future stereochemical predictions that may be made with this system. PART II. Three different routes for the synthesis of the hexahydroisoquinoline 98 met obstacles which defeated our approach to koumine. The Diels-Alder reaction of cyclic 1-azadienes 102 and 108 was abandoned due to the lack of reactivity of the dienes. An anionic oxy-Cope rearrangement of the azabicyclo[2.2.2]octane system caused mainly decomposition of the starting materials. Finally, an intramolecular [2+2] photocycloaddition generated "crossed", "straight" and hydroisoquinoline products in varying ratios, depending on the substituent pattern of the substrate, but this approach was not synthetically useful. The results from this last study may be valuable for predicting the regiochemical outcome of certain intramolecular photocycloadditions.
Download or read book Total Synthesis of Indole Alkaloids written by Junpei Matsuoka and published by Springer Nature. This book was released on 2020-09-18 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores efficient syntheses of indole alkaloids based on gold-catalyzed cascade cyclizations, presenting two strategies for total synthesis of these natural products based on gold-catalyzed reactions of conjugated diyne or ynamide. The book first describes the total and formal synthesis of dictyodendrins A–F based on direct construction of the pyrrolo[2,3-c]carbazole core using the gold-catalyzed annulation of azido-diynes and protected pyrrole. This synthetic strategy features late-stage functionalization of the pyrrolo[2,3-c]carbazole scaffold at several positions and allows diverse access to dictyodendrins and their derivatives. Secondly, the book discusses the formal synthesis of vindorosine based on the pyrrolo[2,3-d]carbazole construction using the gold-catalyzed cascade cyclization of ynamide. Importantly, the reaction using a chiral gold complex provides the optically active pyrrolo[2,3-d]carbazole. This strategy facilitates the rapid construction of the pyrrolocarbazole core structure of aspidosperma and related alkaloids, including vindorosine. These methodologies can accelerate the medicinal application of pyrrolocarbazole-type alkaloids and related compounds.
Download or read book The Total Synthesis of Indole Alkaloids written by Paul Joseph Reider and published by . This book was released on 1978 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Total Synthesis of 16 17 dihydrosecodine and Related Indole Alkaloids written by Robert A. Farr and published by . This book was released on 1981 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indole Alkaloids written by Maliha Uroos and published by Elsevier. This book was released on 2022-01-30 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indole Alkaloids: Spirooxindole details the multistep synthesis of natural products using schematic diagrams, providing a quick-and-easy way to review and understand new and novel synthetic strategies to construct structural frameworks of natural products. As a volume in the Visual Guides to Natural Product Synthesis series, this book presents the schematic total syntheses of natural products containing a “spirooxindole” core structure. It covers spirooxindole molecules through visual diagrams, highlighting key steps involved in total, formal and semi-syntheses. Sections cover Brevianamide A and B, Citrinadin A and B, Coerulescine and Horsfiline, Elacomine and Isoelacomine, Gelsemine, Paraherquamide A and B, Rynchophylline, Isorynchophylline, and more. Visual layouts provide quick-and- easy access to developed synthetic routes towards the targeted spirooxindoles. Outlines synthetic strategies for natural products bearing a spirooxindole core structure Includes schematic diagrams of multistep synthetic routes, highlighting key steps along the way Describes all routes for the formal synthesis, semi-synthesis and total synthesis of spirooxindole alkaloids
Download or read book Novel Approach to the Total Synthesis of Indole Alkaloids Via Cyclopentanoid Intermediates written by Mark Wingfield and published by . This book was released on 1982 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indole Alkaloids written by Rahman and published by CRC Press. This book was released on 1998-06-02 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indole alkaloids constitute an important class of natural products which include a large number of pharmacologically important substances such as the anti-tumour alkaloids, vinblastine and vincristine, the blood pressure lowering substance reserpine, the hallucinatory lysergic acid and its derivatives, and the cardio-arrhythmic alkaloid, ajmalicine. This important field has attracted the leading synthetic organic chemists of the present century to develop synthetic approaches to the challenging structural architecture encountered in many indole alkaloids. The book describes the syntheses of various types of indole alkaloids.
Download or read book Part I General Approach to the Total Synthesis of 9 methoxy Substituted Indole Alkaloids written by Jun Ma and published by . This book was released on 2006 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alkaloid Synthesis written by Hans-Joachim Knoelker and published by Springer Science & Business Media. This book was released on 2012-01-13 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.-
Download or read book Total Synthesis of Tetracyclic Indole Alkaloids written by Martin Francis Jones and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Indole Alkaloids written by Reuben Murray White and published by . This book was released on 2019 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Applications of Selected Name Reactions in the Total Synthesis of Alkaloids written by Majid M. Heravi and published by Elsevier. This book was released on 2021-06-12 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent Applications of Selected Name Reactions in the Total Synthesis of Alkaloids includes comprehensive coverage of name reactions in the synthesis of alkaloids. This book highlights the synthesis of various alkaloids using special name reactions including the Diels-Alder, Friedel-Crafts, Heck, Mannich, Pauson-Khand, Pictet-Spengler, Sonogashira and Suzuki reactions. In this book, some selected name reactions in the total synthesis of alkaloids are covered, as they can be used as the key step/steps in the synthesis of different alkaloids exhibiting various biological activities. All chapters include an introduction, history and mechanism of the name reaction, and present the origin of the natural product and its known biological activities. The pathway to total synthesis is visually illustrated, and the focus is on the step in which a name reaction is applied. Chemists working in the area of synthetic organic chemistry will find this reference useful, as well as those working to develop novel methodologies for the synthesis of natural products in both academia and industry. This book is also beneficial to biologists, pharmacists and botanists. Includes an introduction of alkaloids, their origins and biological properties Features the applications of special name reactions as the key step in the total synthesis of featured alkaloids Covers the pathway for the synthesis of alkaloids from commercially available or easily accessible starting materials by using at least one name reaction to achieve the desired target products
Download or read book The First Total Synthesis of the Indole Alkaloids Macralstonidine 6 oxoalstophylline 10 methoxyvellosimine Lochnerine Sarpagine and an Improved Total Synthesis of Macralstonine and Macroline as Well as the Formal Total Synthesis of Dispegatrine written by Xuebin Liao and published by . This book was released on 2007 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Indole Alkaloids written by W. I. Taylor and published by Elsevier. This book was released on 2013-09-17 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Course in Organic Chemistry Advanced Section, Volume 27: Indole Alkaloids: An Introduction to the Enamine Chemistry of Natural Products describes the chemistry of selected alkaloids that contain indolic or closely related nuclei. Some five hundred of these compounds have been obtained from about three hundred plants mostly of the family Apocynaceae. This book is composed of 12 chapters that specifically cover the chemistry of the complex indoles. The introductory chapters deal with the origin, isolation, characterization, basic chemistry, and simple derivatives of indole alkaloids. The remaining chapters examine the biogenesis, basic chemistry, stereochemistry, and structure of selected complex alkaloids of various origins. These chapters include tetrahydro-?-carboline, strychnos, iboga, picralima, and eburnamine alkaloids, cinchonamine, quinamine, and ajmaline-sarpagine bases. This text is of great value to organic chemists and researchers.
Download or read book Total Synthesis of Ring Expanded Analogs of Bis indole Alkaloids written by Scott Douglas Cowen and published by . This book was released on 1994 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Enantiospecific Total Synthesis of the Indole Alkaloids Talpinine Talcarpine Alstonerine and Anhydromacrosalhine methine as Well as Studies Directed Toward the Synthesis of the Oxindole Alkaloid Alstonisine written by Peng Yu and published by . This book was released on 1999 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
