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Radical and Ion-pairing Strategies in Asymmetric Organocatalysis

Radical and Ion-pairing Strategies in Asymmetric Organocatalysis
  • Author : Maxime R Vitale,Sylvain Oudeyer,Vincent Levacher,Jean-Francois Briere
  • Publisher :Unknown
  • Release Date :2017-07-21
  • Total pages :184
  • ISBN : 9780081011553
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Summary : Considering the challenge of sustainability facing our society in the coming decades, catalysis is without any doubt a research area of major importance. In this regard, asymmetric organocatalysis, now considered a pillar of green chemistry, deserves particular attention. The first chapter of this volume examines the topic of asymmetric organocatalysis in light of radical chemistry. Recent important progress in this field has been attained by promoting the formation and harnessing the high reactivity of open-shell intermediates. Merging organocatalysis with radical chemistry has been the key to solving some longstanding bottlenecks, and has also significantly contributed to reinforcing the key role of organocatalysis in asymmetric catalysis. This chapter presents the most significant developments in this area, with a particular focus on asymmetric SOMO- and photoredox-organocatalyzed transformations. Chapter 2 focuses on quaternary ammonium salts (R4N+X-), especially chiral derivatives, and their behavior as unique catalysts in organocatalysis. Forming chiral ion-pairs capable of promoting asymmetric reactions, they also operate as unique “transporters involved in phase transfer catalytic processes between liquid–liquid or liquid–solid systems. Furthermore, they offer unique opportunities when forming cooperative ion-paired entities R4N+X-, allowing a synergistic implication of the counter-ion X- either as Brønsted bases or Lewis bases. Specific design of such chiral catalysts in modern chemistry and better insight into their mode of activation facilitates efficient and unprecedented chemical transformations. This chapter provides an overview of the use of chiral quaternary ammonium salts in organocatalysis, emphasizing both general mechanistic aspects and the scope of this approach. Presents the most significant developments with a particular focus on asymmetric SOMO- and photoredox-organocatalyzed transformations Givies a larger overview of chiral ammonium salts in organocatalysis rather than a specific review dedicated to specialists in this area Affords a historical evolution of this field of research

Dissertation Abstracts International

Dissertation Abstracts International
  • Author : Anonim
  • Publisher :Unknown
  • Release Date :2008
  • Total pages :229
  • ISBN : STANFORD:36105133522040
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Summary :

Dienamine Catalysis for Organic Synthesis

Dienamine Catalysis for Organic Synthesis
  • Author : Kengadarane Anebouselvy,Dhevalapally B Ramachary,Indresh Kumar
  • Publisher :Unknown
  • Release Date :2018-03-02
  • Total pages :206
  • ISBN : 9781788014328
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Summary : In the past 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.

Recent Advances in Organocatalysis

Recent Advances in Organocatalysis
  • Author : Iyad Karamé,Hassan Srour
  • Publisher :Unknown
  • Release Date :2016-09-28
  • Total pages :192
  • ISBN : 9789535126720
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Summary : Organocatalysis has recently attracted enormous attention as green and sustainable catalysis. It was realized as a fundamental field providing wide families of catalysts for important organic transformations. It will certainly develop in the future. Given the diversity of accessible transformations, metal-catalyzed reactions have become major tools in organic synthesis that will undoubtedly continue to have an important impact in the future. Alternatively, over the last years, a metal-free approach such as organocatalysis has reached a level of faithfulness, allowing researchers to discover new catalytic systems based on engagement of new or early-prepared organic molecules as organocatalysts. Organocatalysis meets green chemistry principles, especially the reduction of toxicity and chemical accidents, the biodegradability, and the use of benign and friendlier reaction media and conditions.

Efficiency in Natural Product Total Synthesis

Efficiency in Natural Product Total Synthesis
  • Author : Pei-Qiang Huang,Zhu-Jun Yao,Richard P. Hsung
  • Publisher :Unknown
  • Release Date :2018-07-20
  • Total pages :512
  • ISBN : 9781118940204
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Summary : Uniting the key organic topics of total synthesis and efficient synthetic methodologies, this book clearly overviews synthetic strategies and tactics applied in total synthesis, demonstrating how the total synthesis of natural products enables scientific and drug discovery. • Focuses on efficiency, a fundamental and important issue in natural products synthesis that makes natural product synthesis a powerful tool in biological and pharmaceutical science • Describes new methods like organocatalysis, multicomponent and cascade reactions, and biomimetic synthesis • Appeals to graduate students with two sections at the end of each chapter illustrating key reactions, strategies, tactics, and concepts; and good but unfinished total synthesis (synthesis of core structure) before the last section • Compiles examples of solid phase synthesis and continuing flow chemistry-based total synthesis which are very relevant and attractive to industry R&D professionals

New Organocatalytic Strategies for the Selective Synthesis of Centrally and Axially Chiral Molecules

New Organocatalytic Strategies for the Selective Synthesis of Centrally and Axially Chiral Molecules
  • Author : Nicola Di Iorio
  • Publisher :Unknown
  • Release Date :2018-04-11
  • Total pages :157
  • ISBN : 9783319749143
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Summary : This thesis discusses the use of asymmetric organic catalysis for the direct enantioselective synthesis of complex chiral molecules, and by addressing the many aspects of both vinylogy and atropisomerism, it appeals to researchers and scholars interested in both areas. Organocatalysis is a relatively modern and “hot” topic in the chemical community; it is constantly expanding and its use has been extended to interesting areas like vinylogous reactivity and atropisomerism. Vinylogous systems are very important for their synthetic applications but also pose a number of challenges, the most notable of which are their reduced reactivity and the reduced stereocontrol at these positions. On the other hand, atropisomeric systems are even more important because of the huge potential they have as drugs, ligands and catalysts. Chemists have only recently “recognized” the importance of these two areas and are focusing their efforts on studying them and the challenges they pose. This thesis offers an extensive introduction on the general aspects of chirality and organocatalysis and an equally extensive experimental section that allow nonexperts to understand the discussion section and reproduce the experiments.

Asymmetric Phase Transfer Catalysis

Asymmetric Phase Transfer Catalysis
  • Author : Keiji Maruoka
  • Publisher :Unknown
  • Release Date :2008-03-31
  • Total pages :228
  • ISBN : 3527318429
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Summary : Edited by the leading expert on the topic, this is the first book to present the latest developments in this exciting field. Alongside the theoretical aspects, the top contributors provide practical protocols to give readers additional important information otherwise unavailable. A must for every synthetic chemist in academia and industry.

Journal

Journal
  • Author : American Chemical Society
  • Publisher :Unknown
  • Release Date :2003
  • Total pages :229
  • ISBN : NYPL:33433068513062
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Summary :

Asymmetric Organocatalysis in Natural Product Syntheses

Asymmetric Organocatalysis in Natural Product Syntheses
  • Author : Mario Waser
  • Publisher :Unknown
  • Release Date :2012-07-30
  • Total pages :197
  • ISBN : 9783709111635
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Summary : This book provides the reader with an illustrative overview concerning successful and widely used applications of organocatalysis in the field of natural product synthesis. The main focus will be on organocatalytic key-steps for each (multi-step) synthesis described, whereas other often particularly innovative transformations will be omitted, as this would be beyond the scope of this volume.

Handbook of Synthetic Photochemistry

Handbook of Synthetic Photochemistry
  • Author : Angelo Albini,Maurizio Fagnoni
  • Publisher :Unknown
  • Release Date :2009-12-09
  • Total pages :484
  • ISBN : 3527628207
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Summary : Unique in its focus on preparative impact rather than mechanistic details, this handbook provides an overview of photochemical reactions classed according to the structural feature that is built in the photochemical step, so as to facilitate use by synthetic chemists unfamiliar with this topic. An introductory section covers practical questions on how to run a photochemical reaction, while all classes of the most important photocatalytic reactions are also included. Perfect for organic synthetic chemists in academia and industry.

Cooperative Catalysis

Cooperative Catalysis
  • Author : René Peters
  • Publisher :Unknown
  • Release Date :2015-04-27
  • Total pages :456
  • ISBN : 9783527336890
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Summary : Written by experts in the field, this is a much–needed overview of the rapidly emerging field of cooperative catalysis. The authors focus on the design and development of novel high–performance catalysts for applications in organic synthesis (particularly asymmetric synthesis), covering a broad range of topics, from the latest progress in Lewis acid / Brønsted base catalysis to e.g. metal–assisted organo catalysis, cooperative metal/enzyme catalysis, and cooperative catalysis in polymerization reactions and on solid surfaces. The chapters are classified according to the type of cooperating activating groups, and describe in detail the different strategies of cooperative activation, highlighting their respective advantages and pitfalls. As a result, readers will learn about the different concepts of cooperative catalysis, their corresponding modes of operation and their applications, thus helping to find a solution to a specific synthetic catalysis problem.

Asymmetric Organocatalysis Combined with Metal Catalysis

Asymmetric Organocatalysis Combined with Metal Catalysis
  • Author : Bruce A. Arndtsen,Liu-Zhu Gong
  • Publisher :Unknown
  • Release Date :2020-04-24
  • Total pages :205
  • ISBN : 9783030438517
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Summary : 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.

Remote Sensing of Sea Ice in the Northern Sea Route

Remote Sensing of Sea Ice in the Northern Sea Route
  • Author : Ola M. Johannessen,Vitali Alexandrov,Ivan Ye. Frolov,Stein Sandven,Lasse H. Pettersson,Leonid P. Bobylev,Kjell Kloster,Vladimir G. Smirnov,Yevgeny U. Mironov,Nikolay G. Babich
  • Publisher :Unknown
  • Release Date :2006-11-30
  • Total pages :472
  • ISBN : 9783540488408
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Summary : Remote Sensing of Sea Ice in the Northern Sea Route: Studies and Applications initially provides a history of the Northern Sea Route as an important strategic transport route for supporting the northern regions of Russia and cargo transportation between Europe and the Northern Pacific Basin. The authors then describe sea ice conditions in the Eurasian Arctic Seas and, using microwave satellite data, provide a detailed analysis of difficult sea ice conditions. Remote sensing techniques and the basic principles of SAR image formation are described, as well as the major satellite radar systems used for ice studies in the Arctic. The authors take a good look at the use of sensing equipment in experiments, including the ICE WATCH project used for monitoring the Northern Sea Route. The possibilities of using SAR remote sensing for ice navigation in the Northern Sea Route is also detailed, analysing techniques of automatic image processing and interpretation. A study is provided of regional drifting ice, fast ice and river ice in the coastal areas of the Arctic Seas. The book concludes with a review of the practical experience using SAR images for supporting navigation and offshore industrial activity, based on a series of experiments conducted with the Murmansk Shipping Company on board nuclear icebreakers.

Homogeneous Gold Catalysis

Homogeneous Gold Catalysis
  • Author : LeGrande M. Slaughter
  • Publisher :Unknown
  • Release Date :2015-03-30
  • Total pages :288
  • ISBN : 9783319137223
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Summary : The series Topics in Current Chemistry presents critical reviews of the present and future trends in modern chemical research. 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. Review articles for the individual volumes are invited by the volume editors. Readership: research chemists at universities or in industry, graduate students.

Organocatalysis

Organocatalysis
  • Author : Manfred Reetz,Benjamin List,Stefan Jaroch,Hilmar Weinmann
  • Publisher :Unknown
  • Release Date :2008-05-27
  • Total pages :342
  • ISBN : 3540734953
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Summary : This book provides an excellent overview on state-of-the-art of modern organocatalysis. It presents the contributions from leading experts, with backgrounds in academia and industry, to an Ernst Schering Research Foundation Symposium held in April 2007. It will be of interest to those who want a general overview of the topic, but also to those who want to learn more about the state-of-the-art, current trends and perspectives in this highly dynamic field of research.

Directory of Graduate Research

Directory of Graduate Research
  • Author : American Chemical Society. Committee on Professional Training
  • Publisher :Unknown
  • Release Date :2005
  • Total pages :229
  • ISBN : UCSD:31822036045805
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Summary : Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.

Catalysis with Earth-abundant Elements

Catalysis with Earth-abundant Elements
  • Author : Uwe Schneider,Stephen Thomas
  • Publisher :Unknown
  • Release Date :2020-10-30
  • Total pages :412
  • ISBN : 9781788011181
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Summary : Considering the limited resources of our planet, earth-abundant elements will have to be explored increasingly in the future. This book highlights the uses of the most earth-abundant elements in catalysis and will be of interest to graduates, academic researchers and practitioners in catalysis.

Artificial Enzymes

Artificial Enzymes
  • Author : Ronald Breslow
  • Publisher :Unknown
  • Release Date :2006-05-12
  • Total pages :193
  • ISBN : 9783527606801
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Summary : This first book on this fascinating topic is edited by one of today's most famous and internationally respected organic chemists, renowned for his pioneering synthesis of the cyclopropenyl cation. For his part, Ronald Breslow has brought together leading scientists in this expanding area to provide a novel overview of protein-, cyclodextrin-, metal- and porphyrin-based artificial enzymes as well as enzyme-like polymers and dendrimers. A must for all scientists interested in this emerging field.

Organophosphorus Chemistry

Organophosphorus Chemistry
  • Author : David W Allen,David Loakes,Lee J Higham,John C Tebby
  • Publisher :Unknown
  • Release Date :2020-04-15
  • Total pages :390
  • ISBN : 9781788018647
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Summary : This annual review of the literature presents a comprehensive and critical survey of the vast field of study involving organophosphorus compounds, from phosphines and related P-C bonded compounds to phosphorus acids, phosphine chalcogenides and nucleotides. The Editors have added to the content with a timely chapter on the recent developments in green synthetic approaches in organophosphorus chemistry to reflect current interests in the area. With an emphasis on interdisciplinary content, this book is aimed at the worldwide organic chemistry and engineering research communities.

Free-Radical Synthesis and Functionalization of Heterocycles

Free-Radical Synthesis and Functionalization of Heterocycles
  • Author : Yannick Landais
  • Publisher :Unknown
  • Release Date :2018-05-03
  • Total pages :352
  • ISBN : 9783319895215
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Summary : This volume describes the recent developments in the free-radical mediated synthesis and elaboration of heterocycles. The first chapter, dealing with radical cascade processes illustrates the power and the beauty of radical chemistry with some striking examples of total synthesis of complex natural heterocycles. As organic chemists strive towards sustainability, radical chemistry has recently seen major advances and efforts in this direction, including C-H activation of arenes and unactivated alkyl groups. Photochemical activation, for a long time the preferred mode of activation in radical chemistry has also seen an unexpected revival with the advent of visible light metal- and organocatalyzed photoredox processes. A survey of these emerging areas is provided along with the concepts at the origin of these developments. The venerable Minisci reaction allows for direct access to functionalized heterocycles. This process has lately seen an interesting renaissance and is discussed in this volume. Addition of heteroatom-centered radicals onto unsaturated systems constitutes another powerful method to construct heterocycles. Examples of such a strategy are proposed along with the formation of various heterocycles relying on homolytic substitution at sulfur, phosphorus and selenium. Additionally free-radical functionalization of reactive functional groups including isonitriles, isothiocyanates and related unsaturated systems which offer a straightforward route towards useful aromatic and non-aromatic heterocycles are discussed. Finally, as metals are able to trigger single electron transfer both in reductive and oxidative modes this provides another possibility for the synthesis of heterocycles. Significant research efforts have focused on the use of samarium, copper and other metals to access a broad variety of heterocycles in a single pot process, starting from readily available raw material. Examples and mechanistic insights are discussed by experts in this area.

Unravelling Single Cell Genomics

Unravelling Single Cell Genomics
  • Author : Nathalie Bontoux,Luce Dauphinot,Marie-Claude Potier
  • Publisher :Unknown
  • Release Date :2010
  • Total pages :318
  • ISBN : 1847559115
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Summary : This unique introduction to the growing field of microfluidics applied to genomics provides an overview of the latest technologies and emphasizes its potential in answering important biological questions. The book starts with key ideas in molecular biology, developmental biology and microtechnology before going on to cover the specifics of single cell analysis and microfluidic devices for single cell molecular analysis. Review chapters discuss the state-of-the art and will prove invaluable to all those planning to develop microdevices for molecular anlaysis of single cells. Methods allowing complete analysis of gene expression in the single cell are stressed- as opposed to the more commonly used techniques that allow analysis of only a few genes at a time. As pioneers in the field, the authors understand how critical it is for a physicist to understand the biological issues and questions related to single cell analysis, as well for biologists to understand what microfluidics is all about. Amied predominantly at graduate students, this book will also be of significant interest to scientists working in or affiliated with this field. Covering the wide-ranging areas of nanoscience and nanotechnology, this series will provide a comprehensive source of information on research associated with nanostrutured materials and miniaturised lab on a chip technologies, books will discuss the interface of chemistry with subjects such as materials science, engineering, biology, physics and electronics to realise developments in this rapidly evolving area.