Download or read book BOROX anion Induced Catalytic Asymmetric Reactions and Their Synthetic Applications written by Wenjun Zhao and published by . This book was released on 2014 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalytic Asymmetric Synthesis written by Takahiko Akiyama and published by John Wiley & Sons. This book was released on 2022-06-15 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalytic Asymmetric Synthesis Seminal text presenting detailed accounts of the most important catalytic asymmetric reactions known today This book covers the preparation of enantiomerically pure or enriched chemical compounds by use of chiral catalyst molecules. While reviewing the most important catalytic methods for asymmetric organic synthesis, this book highlights the most important and recent developments in catalytic asymmetric synthesis. Edited by two well-qualified experts, sample topics covered in the work include: Metal catalysis, organocatalysis, photoredox catalysis, enzyme catalysis C–H bond functionalization reactions Carbon–carbon bond formation reactions, carbon–halogen bond formation reactions, hydrogenations, polymerizations, flow reactions Axially chiral compounds Retaining the best of its predecessors but now thoroughly up to date with the important and recent developments in catalytic asymmetric synthesis, the 4th edition of Catalytic Asymmetric Synthesis serves as an excellent desktop reference and text for researchers and students, from upper-level undergraduates all the way to experienced professionals in industry or academia.
Download or read book Asymmetric Catalysis written by B. Bosnich and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rate of advance in areas of science is seldom constant. Usually certain fields effloresce with activity because of the ~ealization that solutions are possible to long standing important problems. So it is now with asymmetric catalysis, a field which promises to change profoundly the strategic thinking of synthetic chemists. As this Report will show, reagents which can induce catalytic enantiocontrol of chemical transformations could represent the ultimate synthetic method. Nearly all synthetic strategies of complex molecules involve steps which require enantiocontrol and, in many cases, a specific catalytic transformation embodying enan tiocontrol has enormous advantages in terms of the rate and economy of the reaction. Because asymmetric catalysis is in a formative stage, workers with different backgrounds have joined the field. This Workshop had representatives with organometallic, organic, structural, kinetic, enzymatic, microbiological and industrial backgrounds. Each had his own perspective and this Report represents a consensus of this group of eleven people. The result is probably as compre hensive and balanced a view of the subject as is possible at present. It is hoped that those who have until now had but a glancing interest in asymmetric catalysis will find this Report a useful indication of its present state. We believe that asymmetric catalysis will have an increasing impact on the development of chemistry and will eventually dominate much of synthetic and industrial chemistry.
Download or read book Catalytic Methods in Asymmetric Synthesis written by Michelangelo Gruttadauria and published by John Wiley & Sons. This book was released on 2011-09-27 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers advances in the methods of catalytic asymmetric synthesis and their applications. Coverage moves from new materials and technologies to homogeneous metal-free catalysts and homogeneous metal catalysts. The applications of several methodologies for the synthesis of biologically active molecules are discussed. Part I addresses recent advances in new materials and technologies such as supported catalysts, supports, self-supported catalysts, chiral ionic liquids, supercritical fluids, flow reactors and microwaves related to asymmetric catalysis. Part II covers advances and milestones in organocatalytic, enzymatic and metal-based mediated asymmetric synthesis, including applications for the synthesis of biologically active molecules. Written by leading international experts, this book consists of 16 chapters with 2000 References and illustrations of 560 schemes and figures.
Download or read book Applications of Chiral Anions in Asymmetric Catalysis written by Gregory Lawrence Hamilton and published by . This book was released on 2011 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of molecules with control over their three-dimensional configuration, known as absolute stereochemistry, is one of the highest goals of synthetic organic chemists. As is so often the case, we strive to reach the facility and efficiency with which Nature achieves this goal. Fortunately, the chemist's imagination allows us to envision nearly unlimited possibilities for new modes of catalysis. In this dissertation, I discuss one branch of asymmetric catalysis that has in a short time progressed from relative obscurity to the forefront of the ever-expanding set of reactions that can be achieved stereoselectively. The basis of this strategy is ion pairing between chiral anionic species and cationic catalysts or intermediates. Chapter 1 discusses the background of the field. In particular, I examine what factors and precedent led the chemical community to recognize the potential of chiral anions to influence reaction stereoselectivity. Many different contributions skirted around the issue before people began to realize that this type of catalysis represents a distinct area that can be uniquely applicable to certain classes of transformations. The suddenness of this recognition is all the more fascinating because chiral cationic species have used in catalysis for some time. Our laboratory's first endeavor in the arena of chiral anions in documented in Chapter 2. This study dovetailed from the group's work in the area of homogeneous gold catalysis. Because many gold catalysts bear a positive charge, we questioned whether a chiral counteranion could be used to induce asymmetry. We were interested in pursuing this strategy because the traditional approach of using chiral ligands bound to the metal was not always sufficient to obtain high enantioselectivity in gold catalyzed reactions. In fact, a chiral phosphate counteranion was found to mediate certain gold-catalyzed reactions with vastly superior degrees of stereoselectivity. Additionally, chiral ligands could work cooperatively with the chiral counteranion to enable particularly challenging asymmetric reactions. After this, we moved from metal-catalyzed reactions to transformations where the chiral anion could form an ion pair with a cationic reaction intermediate. Based on some precedent, we investigated an asymmetric ring opening of meso-aziridinium ions. This transformation is ideal for testing out the ability of chiral anions because the mechanism essentially dictates that any observed asymmetric induction is a result of an ion pair interaction. Furthermore, it is a type of reaction that is not readily amenable to other forms of asymmetric catalysis because the prochiral intermediate does not possess any basic sites. Here again, a chiral phosphate performed well as a chiral counteranion, promoting the ring opening with alcohol nucleophiles in very high enantioselectivity. The method was also modified to enable an asymmetric opening of episulfonium ions. The final chapter documents a number of different efforts aimed at achieving asymmetric substitutions and additions at all-carbon electrophiles. By this time chiral anions were well established as catalysts for additions to several classes of heteroatom-stablized cationic electrophiles. However, additions to carbocations or their functional equivalents were largely out of reach. Our hypothesis was that catalysts capable of interacting covalently with carbon electrophiles could facilitate the asymmetric substitution process. Thus we examined a variety of polarizable anionic and neutral catalyst structures. While our ideas for substitutions of carbon-centered leaving groups were generally unsuccessful in producing a highly enantioselective reaction, the same concepts did lead to an asymmetric addition of amine nucleophiles to dienes. Studies of the mechanism suggested that the catalyst did in fact add covalently to the electrophile before being displaced, thereby validating our original thinking on the subject.
Download or read book Asymmetric Catalysis from a Chinese Perspective written by Shengming Ma and published by Springer Science & Business Media. This book was released on 2011-07-06 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Qi-Lin Zhou and Jian-Hua Xie: Chiral Spiro Catalysts.- Fuk Loi Lam, Fuk Yee Kwong and Albert S. C. Chan: Chiral Phosphorus Ligands with Interesting Properties and Practical Applications.- Jiang Pan, Hui-Lei Yu, Jian-He Xu, Guo-Qiang Lin: Advances in Biocatalysis: Enzymatic Reactions and Their Applications.- Mei-Xiang Wang: Enantioselective Biotransformations of Nitriles.- Man Kin Wong, Yiu Chung Yip and Dan Yang: Asymmetric Epoxidation Catalyzed by Chiral Ketones.- W. J. Liu, N. Li and L. Z. Gong: Asymmetric Organocatalysis.- Qing-Hua Fan and Kuiling Ding: Enantioselective Catalysis with Structurally Tunable Immobilized Catalysts.- Chang-Hua Ding, Xue-Long Hou: Transition Metal-Catalyzed Asymmetric Allylation.- Jian Zhou and Yong Tang: Enantioselective Reactions with Trisoxazolines.- Xiang-Ping Hu, Duo-Sheng Wang, Chang-Bin Yu, Yong-Gui Zhou, and Zhuo Zheng: Adventure in Asymmetric Hydrogenation: Synthesis of Chiral Phosphorus Ligands and Asymmetric Hydrogenation of Heteroaromtics.
Download or read book Organocatalysis written by Maurizio Benaglia and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-07-19 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organocatalysis is considered today one of the three pillars in asymmetric catalysis, along with biocatalysis and organometallic catalysis. The current book gives an overview of the new reactions, the catalysts and their activation strategies reported in recent years. In addition, the applications of organocatalysis in total synthesis, radical reactions, flow chemistry and industrial practice are discussed.
Download or read book Catalysis in Asymmetric Synthesis written by Vittorio Caprio and published by John Wiley & Sons. This book was released on 2009-03-09 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asymmetric synthesis has become a major aspect of modern organic chemistry. The stereochemical properties of an organic compound are often essential to its bioactivity, and the need for stereochemically pure pharmaceutical products is a key example of the importance of stereochemical control in organic synthesis. However, achieving high levels of stereoselectivity in the synthesis of complex natural products represents a considerable intellectual and practical challenge for chemists. Written from a synthetic organic chemistry perspective, this text provides a practical overview of the field, illustrating a wide range of transformations that can be achieved. The book captures the latest advances in asymmetric catalysis with emphasis placed on non-enzymatic methods. Topics covered include: Reduction of alkenes, ketones and imines Nucleophilic addition to carbonyl compounds Catalytic carbon-carbon bond forming reactions Catalytic reactions involving metal carbenoids Conjugate addition reactions Catalysis in Asymmetric Synthesis bridges the gap between undergraduate and advanced level textbooks and provides a convenient point of entry to the primary literature for the experienced synthetic organic chemist.
Download or read book New Frontiers in Asymmetric Catalysis written by Koichi Mikami and published by John Wiley & Sons. This book was released on 2007-02-16 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compilation of recent advances and applications in asymmetric catalysis The field of asymmetric catalysis has grown rapidly and plays a key role in drug discovery and pharmaceuticals. New Frontiers in Asymmetric Catalysis gives readers a fundamental understanding of the concepts and applications of asymmetric catalysis reactions and discusses the latest developments and findings. With contributions from preeminent scientists in their respective fields, it covers: * "Rational" ligand design, which is critically dependent on the reaction type (reduction, oxidation, and C-C bond formation) * Recent findings on activation of C-H bonds, C-C bonds, and small molecules (C=O, HCN, RN=C, and CO2) and the latest developments on C-C bond reorganization, such as metathesis * Advances in "chirally economical" non-linear phenomena, racemic catalysis, and autocatalysis * Some of the recent discoveries that have led to a renaissance in the field of organocatalysis, including the development of chiral Brönstead acids and Lewis acidic metals bearing the conjugate base of the Brönstead acids as the ligands and the chiral bi-functional acid/base catalysts The book ends with a thought-provoking perspective on the future of asymmetric catalysis that addresses both the challenges and the unlimited potential in this burgeoning field. This is an authoritative, up-to-date reference for organic chemists in academia, government, and industries, including pharmaceuticals, biotech, fine chemicals, polymers, and agriculture. It is also an excellent textbook for graduate students studying advanced organic chemistry or chemical synthesis.
Download or read book Catalytic Asymmetric Conjugate Reactions written by Armando Cordova and published by John Wiley & Sons. This book was released on 2010-12-01 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique and long-awaited handbook on this important topic in the hot field of stereoselective organic synthesis covers several types of nucleophiles. Top international authors deal with modern forms of achieving stereoselective conjugate additions based on the use of chiral auxiliaries or asymmetric catalysis, such as P-N ligands, organocatalysis, domino reactions, Lewis acid and base catalysis. There is also a discussion of the employment of enantioselective conjugate addition transformations in total synthesis of important molecules. With its reliable and previously unpublished experimental procedures, this is a true source of high quality information.
Download or read book Green Approaches To Asymmetric Catalytic Synthesis written by Angela Patti and published by Springer Science & Business Media. This book was released on 2011-08-22 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, chirality is widely accepted as an important factor in molecular recognition processes and the biological activity of many pharmaceutical drugs and agrochemicals; this is confirmed by the continuous need for synthetic methods which lead to single or enriched enantiomers of such compounds. By presenting a review of the various and more recently developed approaches for both metal-transition and organocatalysis, this volume describes the development of “greener” asymmetric reactions which preserve stereoselectivity. The author summarizes the impressive amount of research that has been gathered within this field into three chapters focusing on: i)the search of alternative catalysts, ii) alternative solvents, and iii) alternative synthetic strategies and processes. For each topic, the fundamentals and some valuable applications are discussed.
Download or read book Principles and Applications of Asymmetric Synthesis written by Guo-Qiang Lin and published by Wiley-Interscience. This book was released on 2003-05-29 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asymmetric synthesis remains a challenge to practicing scientists as the need for enantiomerically pure or enriched compounds continues to increase. Over the last decade, a large amount of literature has been published in this field. Principles and Applications of Asymmetric Synthesis consolidates and evaluates the most useful methodologies into a one-volume resource for the convenience of practicing scientists and students. Authored by internationally renowned scientists in the field, this reliable reference covers more than 450 reactions and includes important stoichiometric as well as catalytic asymmetric reactions. The first chapter reviews the basic principles, common nomenclature, and analytical methods, and the remainder of the book is organized according to reaction type. The text examines such topics as: Carbon-carbon bond formations involving carbonyls, enamines, imines, and enolates Asymmetric C-O bond formations including epoxidation, dihydroxylation, and aminohydroxylation Asymmetric synthesis using the Diels-Alder reaction and other cyclizations Applications to the total synthesis of natural products Use of enzymes in asymmetric synthesis Practicing chemists in the pharmaceutical, fine chemical, and agricultural professions as well as graduate students will find that Principles and Applications of Asymmetric Synthesis affords comprehensive and current coverage.
Download or read book Catalytic Asymmetric Friedel Crafts Alkylations written by Marco Bandini and published by Wiley-VCH. This book was released on 2009-06-10 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first comprehensive overview of this important synthetic reaction covers the whole spectrum of this modern and rapidly developing field. Clearly structured, the book presents all the known synthetic approaches for the construction of aromatic compounds bearing benzylic stereocenters with a defined configuration. With its representative synthetic procedures, organocatalysis and industrial applications it combines a theoretical basis with practical examples, resulting in valuable advice for beginners and experts alike. The ultimate source for every synthetic chemist in academia and industry.
Download or read book Catalytic Asymmetric Synthesis Enabled by VANOL VAPOL Borox Catalysts written by Hong Ren and published by . This book was released on 2013 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalytic Asymmetric Reactions of Conjugated Nitroalkenes written by Irishi Namboothiri and published by CRC Press. This book was released on 2020-08-13 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nitroalkenes have often been referred to as "synthetic chameleons" owing to their reactivity, synthetic utility and biological significance. In the last two decades, the reactivity of nitroalkenes as substrates in diverse catalytic asymmetric transformations has been of tremendous interest. This is due to the powerful electron withdrawing and co-ordinating ability of the nitro group and the amenability of the nitro group to undergo a wide variety of synthetic transformations. Although numerous original articles and reviews have appeared in the literature, a monograph providing comprehensive coverage of this topic was conspicuous by its absence. In the light of the above, this book features: A systematic, up-to-date, in-depth and well organized compilation, spread over twelve chapters, of various catalytic asymmetric reactions of nitroalkenes with diverse substrates reported till date Wide coverage of reactions such as Michael additions, Friedel-Crafts reactions, cycloadditions, asymmetric reductions, multi-component and cascade reactions as well as other miscellaneous reactions Various chiral organo-, metal- and even bio-catalysts involved in the stereoselective synthesis of multi-functional adducts via catalytic asymmetric reactions of nitroalkenes Schemes and figures detailing all the reagents, reaction conditions and product profile Mechanistic details, including transition state models, which will be useful for effective catalytic design This book will be an invaluable resource for those who are working in the area of asymmetric catalysis and synthetic methodologies"--
Download or read book The Discovery and Synthetic Applications of Catalytic Asymmetric Ring Opening Reactions written by Michael Han-cheng Wu and published by . This book was released on 1999 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthetic Application of Fischer Carbene Complexes and Catalytic Asymmetric Reactions written by Jianming Bao and published by . This book was released on 1993 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt:
