Organo Catalytic Strategies Towards Alpha Alpha Disubstituted Amino Acid Derivatives
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Organo Catalytic Strategies Towards Alpha Alpha Disubstituted Amino Acid Derivatives
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Author : Henning Vogt
language : en
Publisher:
Release Date : 2006
Organo Catalytic Strategies Towards Alpha Alpha Disubstituted Amino Acid Derivatives written by Henning Vogt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The class of non-proteinogenic a,a u2011disubstituted amino acids and their derivatives is of high interest to biochemical and pharmacological research. This predicates on their ability to alter certain chemical and physicochemical properties of peptides and related structures. Moreover, the close structural relatedness to biologically relevant endogenous amino acid derivatives qualifies them in many cases to act as enzyme inhibitors or receptor antagonists.In the present study, the development of new strategies towards the synthesis of N u2011protected a,a u2011disubstituted amino aldehydes and their derivatives is demonstrated. Starting from ketones, a,a u2011disubstituted aldehydes were prepared in two or three steps. These aldehydes were subjected to stereoselective organo-catalysed a u2011amination reactions. The transfer of a procedure known for the a u2011amination of a u2011unbranched aldehydes with azodicarboxylates to racemic a u2011branched aldehydes delivered N u2011protected aminoaldehydes in up to 87 % yield and 86 % ee. The conversion of the amination products to the corresponding N u2011protected 4,4 u2011disubstituted oxazolidinones was accomplished, after in situ-reduction, in two additional steps.In addition to this method, a new strategy was devised using sulfonyl azides as aminating agent to deliver a u2011sulfamidated a,a u2011disubstituted aldehydes in up to 55 % yield and 86 % ee. A mechanism was proposed, which differs fundamentally from the mechanistic model usually ascribed to enamine catalysis. The transformation of the sulfamidation product into the free amino acid was accomplished in two steps.Since the two concepts follow different mechanistic routes, different enantiomers of N u2011protected, a,a u2011disubstituted aminoaldehydes are accessible by one catalyst. All reactions involved in the latter approach are free of transition metals. Therefore, the presented strategy could prove to be especially useful for medicinal chemistry.
Asymmetric Synthesis And Application Of Alpha Amino Acids
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Author : Vadim A Soloshonok
language : en
Publisher: American Chemical Society
Release Date : 2009-07-09
Asymmetric Synthesis And Application Of Alpha Amino Acids written by Vadim A Soloshonok and has been published by American Chemical Society this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-07-09 with Language Arts & Disciplines categories.
This volume presents the most recent and comprehensive collection of reviews on methodological developments in the field of alpha-amino acids.
Methods Of Non Amino Acid Synthesis Second Edition
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Author : Michael Bryant Smith
language : en
Publisher: CRC Press
Release Date : 2013-10-23
Methods Of Non Amino Acid Synthesis Second Edition written by Michael Bryant Smith and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-23 with Science categories.
Although less common than α-amino acids, non-α-amino acids—where the amino group is not on the carbon immediately adjacent to the carboxyl group but is attached to another carbon in the chain (for example, the β, γ, δ carbon)—are components of biologically important molecules, are significant in the pharmaceutical industry, and are useful starting materials for many areas of organic chemistry. Since the publication of the first edition of this book nearly 20 years ago, synthetic work devoted to the preparation of non- α-amino acids has expanded greatly. Methods of Non-α-Amino Acid Synthesis, Second Edition has been extensively rewritten and reorganized, providing an up-to-date review of strategies and methods for non-α-amino acid synthesis, particularly those amino acids that are key synthetic intermediates or important compounds in their own right. It focuses on acyclic amino acids of C3–C10, but also aminoalkanoic carboxylic acids, aminoalkenoic acids, and aminoalkynoic acids. The new edition contains many updated references and has a greater emphasis on the biological importance of non-α-amino acids. In addition to an array of synthetic methods, the book offers discussions on why non-α-amino acids are important. The book covers synthetic methods that rely on substituent refunctionalization, the conversion of cyclic precursors to acyclic amino acids, conjugate addition reactions, and enolate anion reactions and condensation reactions that lead to non-α-amino acids. It also examines reactions and strategies that lead to good diastereoselectivity and enantioselectivity during synthesis. A chapter devoted to biologically important amino acids includes separate sections on GABA, GABOB, carnitine, DAVA, statine, and other significant amino acids as well as a new section on peptides and proteins that contain non-α-amino acids. The final chapter addresses aminocyclic and heterocyclic amino acids.
Ideas In Chemistry And Molecular Sciences
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Author : Bruno Pignataro
language : en
Publisher: John Wiley & Sons
Release Date : 2010-04-16
Ideas In Chemistry And Molecular Sciences written by Bruno Pignataro and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-04-16 with Science categories.
Written by some of the most talented young chemists in Europe, this text covers most of the groundbreaking issues in chemistry. It provides an account of the latest research results in European chemistry based on a selection of leading young scientists participating in the 2008 European Young Chemists Award competition. The contributions range from self-organization to new catalytic synthetic methodologies to organocatalysis. In addition, the authors provide a current overview of their field of research and a preview of future directions. For organic, catalytic, natural products and biochemists.
Organocatalysis
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Author : Maurizio Benaglia
language : en
Publisher: Walter de Gruyter GmbH & Co KG
Release Date : 2021-07-19
Organocatalysis written by Maurizio Benaglia and has been published by Walter de Gruyter GmbH & Co KG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-07-19 with Science categories.
Organocatalysis is considered today one of the three pillars in asymmetric catalysis, along with biocatalysis and organometallic catalysis. The possibility to combine organocatalysis with radical chemistry, photocatalysis and enabling technologies opened new avenues in organic synthesis.
Methodologies In Amine Synthesis
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Author : Alfredo Ricci
language : en
Publisher: John Wiley & Sons
Release Date : 2021-01-20
Methodologies In Amine Synthesis written by Alfredo Ricci and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-01-20 with Science categories.
Discover a comprehensive overview of efficient synthetic routes to an important compound class in organic and pharmaceutical chemistry Methodologies in Amine Synthesis: Challenges and Applications delivers powerful and state-of-the-art methods for the efficient preparation of amines. The text summarizes recent advances in the electrophilic amination reaction, hydroamination, C-H amination and newly developed photocatalytic approaches. The distinguished editor has included resources that discuss organocatalytic and enzymatic routes to the generation of amines under mild and environmentally friendly conditions. The book also highlights the relevance of the amino function in bioactive molecules, drugs, and smart materials, as well as the palladium-catalyzed aromatic amination reaction. It presents efficient and practical synthetic methods, highlights the opportunities and challenges associated with each, and discusses their possible applications in pharmaceutical chemistry and materials science. Edited by the expert who wrote Modern Amination Methods and Amino Group Chemistry, the book includes a breadth and depth of material essential to the practice of academic and industrial chemists working in organic synthesis and catalysis. Readers will also benefit from the inclusion of: A thorough introduction to new openings and perspectives in the electrophilic amination Discussions of asymmetric catalysed hydroaminomethylation and amino organocatalysis A treatment of the synthetic application of transaminase or MAO biocatalysis to the synthesis of amines An exploration of recent developments in C-H amination, as well as photocatalytic approaches to the synthesis of amines An examination of primary amines from renewable bio-based resources Perfect for organic, natural product, catalytic, medicinal, and polymer chemists, Methodologies in Amine Synthesis: Challenges and Applications will also earn a place in the libraries of materials scientists and chemists working with organometallics who desire a one-stop reference edited by a well-known expert in the field.
Index Medicus
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Author :
language : en
Publisher:
Release Date : 2004
Index Medicus written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Medicine categories.
Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
Organic Reaction Mechanisms 2006
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Author : A. C. Knipe
language : en
Publisher: John Wiley & Sons
Release Date : 2010-04-20
Organic Reaction Mechanisms 2006 written by A. C. Knipe and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-04-20 with Science categories.
Organic Reaction Mechanisms 2006 is the 42nd volume in this classical series. Every year, an experienced team of authors compiles these reviews, so that the reader can rely on a continuing quality of selection and presentation. Detailed author and subject indexes help the reader to find the information they are looking for. As a new service to the reader, all reaction mechanisms leading to stereospecific products are highlighted. This reflects the interest of synthetic organic chemists in such reactions and the pharmaceutical role of chiral molecules.
Catalytic Asymmetric Synthesis
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Author : Takahiko Akiyama
language : en
Publisher: John Wiley & Sons
Release Date : 2022-05-27
Catalytic Asymmetric Synthesis written by Takahiko Akiyama and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-05-27 with Science categories.
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.
Stereoselective Multiple Bond Forming Transformations In Organic Synthesis
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Author : Jean Rodriguez
language : en
Publisher: John Wiley & Sons
Release Date : 2015-04-03
Stereoselective Multiple Bond Forming Transformations In Organic Synthesis written by Jean Rodriguez and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-04-03 with Science categories.
Combining the important research topic of multiple bond-formingtransformations with green chemistry, this book helps chemistsidentify recent sustainable stereoselective syntheticsequences. • Combines the important research topic ofmultiple bond-forming transformations with green chemistry andsustainable development • Offers a valuable resource for preparingcompounds with multiple stereogenic centers, an important field forsynthetic chemists • Organizes chapters by molecular structureof final products, making for a handbook-style resource • Discusses applications of the synthesisof natural products and of drug intermediates • Brings together otherwise-scatteredinformation about a number of key, efficient chemical reactions