Application of Chiral Borates in Asymmetric Catalysis and Chiral Resolution PDF Download
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Author: Xiaopeng Yin
Publisher:
ISBN: 9780355579468
Category : Electronic dissertations
Languages : en
Pages : 424
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Book Description
Author: Xiaopeng Yin
Publisher:
ISBN: 9780355579468
Category : Electronic dissertations
Languages : en
Pages : 424
Get Book Here
Book Description
Author: Hans Ulrich Blaser
Publisher: John Wiley & Sons
ISBN: 3527642161
Category : Science
Languages : en
Pages : 517
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Book Description
This second edition of the pioneering work on this hot topic captures the major trends and latest achievements in the art of asymmetric catalysis on an industrial scale. A number of completely new real-life case studies written by the world leaders in their respective areas provide a compact and qualified insight into this developing field. The resulting ready reference and handbook collates first-hand and valuable information within a context where it can be easily found. The high-quality contributions illustrate the relevant environments and situations, such as time pressure, how the catalytic step fits into the overall synthesis, or competition with other synthetic approaches, as well as the typical problems encountered in the various phases, including finding/developing the catalyst and optimization of the process or choice of equipment. Both successful and unsuccessful approaches to solve these problems are described.
Author: Li Zheng
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 271
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Book Description
A potent chiral aluminum catalyst has been developed for asymmetric MPV reduction of ketones with broad substrate scope and excellent yields and enantiomeric inductions. The catalyst consists an aluminum core, a VANOL-derived chiral ligand and an isopropoxy group. Different ligands have been screened and reaction parameters have been optimized. A variety of aromatic (both electron-poor and electron-rich) and aliphatic ketones were converted to chiral alcohols in good yields with high enantioselectivities (26 examples, 70-98% yield and 82-99% ee). This method operates under mild conditions (-10 °C) and low catalyst loading (1-10 mol%). Furthermore, this process is catalyzed by the earth-abundant main group element aluminum and employs inexpensive and environmentally benign 2-propanol as hydride source. This catalyst has also been employed in resolution of racemic alcohols. The kinetic resolution of alcohols by Oppenauer oxidation has been achieved with moderate results. The formal dynamic kinetic resolution via Oppenauer oxidation/ MPV reduction sequence has also been examined and discussed, which avoided acylation and the use of enzymes.A highly efficient asymmetric heteroatom Diels-Alder reaction between diene and aldehydes for the construction of 6-membered heterocycles catalyzed by chiral boron catalysts has been developed. A BINOL-derived propeller borate is found to be effective catalyzing the reaction of aromatic aldehydes. A VANOL-derived meso-borate is found to be able to catalyze the reaction of both aromatic and aliphatic aldehydes with high asymmetric inductions. Excellent yields and enantioselectivities have been achieved after optimization. Furthermore, the skeleton of 6-carbon saccharides is synthesized in the reaction of 2-hydoxyacetaldehyde with different protecting groups, which can be derivatized into many saccharide analogs. The mechanism of this reaction is proposed to be concerted based on experiments involving different methods for the reaction quench. A reversal of direction of the asymmetric induction by switching boron to aluminum has been observed. Computational studies show that catalysts derived from boron and aluminum have different geometries at the Lewis acid center.
Author: Eric N. Jacobsen
Publisher: Springer Science & Business Media
ISBN: 9783540209836
Category : Science
Languages : en
Pages : 158
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Book Description
The second supplement to the three volume reference work Comprehensive Asymmetric Catalysis critically reviews new developments to the hottest topics in the field written by recognised experts. Seven chapters which are already in the major reference work have been supplemented and additionally a new chapter on Aminohydroxylation of Carbon-Carbon Double Bonds has been included. Thus, the state of the art in this area is now re-established. Together with the basic three volume book set and Supplement 1 it is not only the principal reference source for synthetic organic chemists, but also for all scientific researchers who use chiral compounds in their work (for example, in biochemical investigations and molecular medicine) as well as for pharmaceutical chemists and other industrial researchers who prepare chiral compounds.
Author: Eric N. Jacobsen
Publisher: Springer Science & Business Media
ISBN: 9783540003335
Category : Science
Languages : en
Pages : 258
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Book Description
The first supplement to the three volume reference work "Comprehensive Asymmetric Catalysis" critically reviews new developments to the hottest topics in the field written by recognised experts. Eleven chapters which are already in the major reference work have been supplemented and additionally five new chapters have been included. Thus the state-of-the art in this area is now re-established. Together with the basic three volume book set this supplement is not only the principal reference source for synthetic organic chemists, but also for all scientific researchers who use chiral compounds in their work (for example, in biochemical investigations and molecular medicine) as well as for pharmaceutical chemists and other industrial researchers who prepare chiral compounds.
Author: Michelangelo Gruttadauria
Publisher: John Wiley & Sons
ISBN: 0470641363
Category : Science
Languages : en
Pages : 720
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Book Description
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.
Author: A. N. Collins
Publisher: John Wiley & Sons
ISBN: 9780471982845
Category : Science
Languages : en
Pages : 432
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Book Description
This second volume of Chirality in Industry contains new case histories from a wide range of contributors from industry or with strong industrial connections. While it is intended that the new volume will stand on its own, Volumes I and II taken together present an up-to-date and comprehensive picture of the technologies required to produce optically active compounds on a multi-kilogramme to high tonnage scale as well as illustrating the breadth of application of these technologies; the pharmaceuticals, agrochemicals, electronics, food, flavour and fragrance industries are all represented. Chirality in Industry II All new case histories Unique industrial perspective on chiral technology Emphasis on scale-up and process development Comparison of biocatalysis, asymmetric synthesis and classical resolution approaches The chiral infrastructure is now largely in place and there is no reason why large-scale production should not be possible for even moderately priced single enantiomer products. The successful industrial application of chiral chemistry depends on the integration of a range of supporting technologies and there are many examples in this volume of how widely the industrial practitioner must cast the net to achieve practical production methods. As with Volume I, this new volume is of particular interest to those professionally involved in the scale-up processes for single enantiomers. However, students and researchers involved in a more academic pursuit of optical activity will also benefit from some of the facets of large-scale thinking. An economic solution is still most likely to be a simple, elegant solution.
Author: Li-Xin Dai
Publisher: John Wiley & Sons
ISBN: 3527322809
Category : Science
Languages : en
Pages : 433
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Book Description
This book meets the long-felt need for a reference on ferrocenes with the focus on catalysis. It provides a thorough overview of the synthesis and characterization of different types of chiral ferrocene ligands, their application to various catalytic asymmetric reactions, and versatile chiral materials as well as drug intermediates synthesized from them. Written by the "who's who" of ferrocene catalysis, this is a guide to the design of new ferrocene ligands and synthesis of chiral synthetic intermediates, and will thus be useful for organic, catalytic and synthetic chemists working in academia, industrial research or process development.
Author: Takahiko Akiyama
Publisher: John Wiley & Sons
ISBN: 1119736390
Category : Science
Languages : en
Pages : 798
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Book Description
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.
Author: Hélène Pellissier
Publisher: John Wiley & Sons
ISBN: 3527341145
Category : Science
Languages : en
Pages : 606
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Book Description
The first handbook to focus on the asymmetric synthesis of different types of three-membered rings. The outstanding and experienced authors have an excellent international reputation and cover cyclopropanes, epoxides and aziridines as well as chiral oxaziridines in equal measure. To this end, they describe in detail different synthetic approaches starting with chiral substrates as well as the application of chiral metal- or organocatalysts. Furthermore, methods for the kinetic resolution of initially racemic products are treated alongside recent advances and novel developments in established techniques for the synthesis of three-membered rings. With its structured composition this is of high interest to scientists in methodological and natural product synthesis as well as those in industrial and pharmaceutical chemistry.
