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Author: Jonathan Clayden
Publisher: Elsevier
ISBN: 9780080432625
Category : Science
Languages : en
Pages : 408
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Book Description
Organolithiums: Selectivity for Synthesis.
Author: Jonathan Clayden
Publisher: Elsevier
ISBN: 9780080432625
Category : Science
Languages : en
Pages : 408
Get Book Here
Book Description
Organolithiums: Selectivity for Synthesis.
Author: Jonathan Clayden
Publisher: Elsevier
ISBN: 0080538169
Category : Science
Languages : en
Pages : 401
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Book Description
This volume, number 23 in the "Tetrahedron Organic Chemistry" series, presents organolithium chemistry from the perspective of a synthetic organic chemist, drawing from the synthetic literature to present a unified overview of how organolithiums can be used to make molecules. The development of methods for the regioselective synthesis of organolithiums has replaced their image of indiscriminate high reactivity with one of controllable and subtle selectivity. Organolithium chemistry has a central role in the selective construction of C-C bonds in both simple and complex molecules, and for example has arguably overtaken aromatic electrophilic substitution as the most powerful method for regioselective functionalisation of aromatic rings. The twin themes of reactivity and selectivity run through the book, which reviews the ways by which organolithiums may be formed and the ways in which they react. Topics include advances in directed metallation, reductive lithiation and organolithium cyclisation reactions, along with a discussion of organolithium stereochemistry and the role played by ligands such as (-)-sparteine.
Author: David M. Hodgson
Publisher: Springer Science & Business Media
ISBN: 3540001042
Category : Science
Languages : en
Pages : 325
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Book Description
This volume is the first dedicated to a comprehensive coverage of this rapidly developing transdisciplinary field. It provides a rich source of essential information on synthesizing molecules in an enantioselective manner using organolithiums, and serves as an inspiration for future developments.
Author: R.E. Gawley
Publisher: Elsevier
ISBN: 0080514774
Category : Science
Languages : en
Pages : 395
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Book Description
The world is chiral. Most of the molecules in it are chiral, and asymmetric synthesis is an important means by which enantiopure chiral molecules may be obtained for study and sale. Using examples from the literature of asymmetric synthesis (more than 1300 references), the aim of this book is to present a detailed analysis of the factors that govern stereoselectivity in organic reactions. It is important to note that the references were each individually checked by the authors to verify relevance to the topics under discussion. The study of stereoselectivity has evolved from issues of diastereoselectivity, through auxiliary-based methods for the synthesis of enantiomerically pure compounds (diastereoselectivity followed by separation and auxiliary cleavage), to asymmetric catalysis. In the latter instance, enantiomers (not diastereomers) are the products, and highly selective reactions and modern purification techniques allow preparation - in a single step - of chiral substances in 99% ee for many reaction types. After an explanation of the basic physical-organic principles of stereoselectivity, the authors provide a detailed, annotated glossary of stereochemical terms. A chapter on "Analytical Methods" provides a critical overview of the most common methods for analysis of stereoisomers. The authors then follow the 'tried-and-true' format of grouping the material by reaction type. Thus, there are four chapters on carbon-carbon bond forming reactions (enolate alkylations, organometal additions to carbonyls, aldol and Michael reactions, and cycloadditions and rearrangements), one chapter on reductions and hydroborations (carbon-hydrogen bond forming reactions), and one on oxidations (carbon-oxygen and carbon-nitrogen bond forming reactions). Leading references are provided to natural product synthesis that have been accomplished using a given reaction as a key step. In addition to tables of examples that show high selectivity, a transition state analysis is presented to explain - to the current level of understanding - the stereoselectivity of each reaction. In one case (Cram's rule) the evolution of the current theory is detailed from its first tentative (1952) postulate to the current Felkin-Anh-Heathcock formalism. For other reactions, only the currently accepted rationale is presented. Examination of these rationales also exposes the weaknesses of current theories, in that they cannot always explain the experimental observations. These shortcomings provide a challenge for future mechanistic investigations.
Author: Thomas Hurrle
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832547770
Category : Science
Languages : en
Pages : 318
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Book Description
Since the discovery of the endocannabinoid system, cannabis and cannabinoids have received renewed attention. The elucidation of the biochemical machinery responsible for cannabinoid effects, has led to the identification of several targets that can be addressed by cannabinoid analogs. The most prominent targets are the cannabinoid receptors CB1 and CB2. The endocannabinoid system acts as a versatile regulating system found in mammals that is involved in a broad range of physiological and neuronal processes. Accordingly, cannabinoid ligands have been proposed for the treatment of a large number of diseases and symptoms, including cancer, multiple sclerosis and AIDS. In the present thesis, several strategies to address the endocannabinoid system were pursued. Besides the synthesis of well over a hundred potentially active new compounds based on the lead structure of the potent cannabinoid analogs, 3-benzylcoumarins, a formal total synthesis of tetrahydrocannabinol (THC) via an DIELS-ALDER-reaction was concluded. Additionally, some of the most potent compounds from preceding work have been encapsulated in micro- and nanoparticulate carrier systems. The particles were capable to release their cannabinoid payloads over hours, days, weeks and even months. The described microparticulate carrier systems should be able to generate site specific and long-term stable drug levels.
Author: Renzo Luisi
Publisher: John Wiley & Sons
ISBN: 3527667539
Category : Science
Languages : en
Pages : 705
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Book Description
This unique book covers fundamentals of organolithium compounds and gives a comprehensive overview of the latest synthetic advances and developments in the field. Part I covers computational and spectroscopic aspects as well as structure-reactivity relationships of organolithiums, whereas Part II deals with new lithium-based synthetic methodologies as well as novel synthetic applications of functionalized lithium compounds. A useful resource for newcomers and active researchers involved in organic synthesis, whether working in academia or industry!
Author: Zvi Rappoport
Publisher: John Wiley & Sons
ISBN: 0470021101
Category : Science
Languages : en
Pages : 1400
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Book Description
This is the first volume in the series to concentrate on organo-lithium compounds - the sub series "The chemistry of the metal-carbon bond" (5 vol) treated organometallics in general. It deals with theoretical/physical/computational apsects, as well as major spectroscopies, such as MS, NMR, IR/UV etc and both biological and industrial applications. The core of the volume is the synthetic chapters with lots of examples for modern synthetic approaches Written by key researchers in the field An invaluable reference source to organic chemists working in academia and industry Features important reagents in organic synthesis
Author: Robert E. Gawley
Publisher: John Wiley & Sons
ISBN: 3906390632
Category : Science
Languages : en
Pages : 305
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Book Description
Topics in Stereochemistry, previously edited by "the father of stereochemistry" Ernest L. Eliel, is a longstanding, successful series covering the most important advances in the field. The much-anticipated Volume 26 on stereochemical aspects of organolithium compounds includes chapters on the following topics: * Asymmetric Deprotonations Using Chiral Lithium Amide Bases * Self-Regeneration of Stereocenters (SRS) via Stereolabile Axially Chiral Intermediates * Overview of Carbanion Dynamics and Electrophilic Substitutions in Chiral Organolithium Compounds * Oxiranyllithiums as Chiral Synthons for Asymmetric Synthesis * Test on the Configurational Stability/Lability of Organolithium Compounds * Mechanism and Stereochemical Features in Asymmetric Deprotonation Using RLi/(-)-Sparteine Bases * Dynamic Resolutions of Chiral Organolithiums Volume 26 of Topics in Stereochemistry marks the end of an era, while developing a bridge to the next generation. A new generation in publishing, parallel to a new generation in Stereochemistry mandated a new venue and modus operandi for Topics. Zurich, the home of Werner and Wislicenus, has a unique heritage in Stereochemistry. Fortunately, the Wiley family's publishing partnerships include Verlag Helvetica Chimica Acta, a house with a reputation for superior quality in publishing. Indeed, within the pages of its namesake periodical, Helvetica Chimica Acta, one finds many of the seminal research works of stereochemistry's giants. As such, a transfer of editorial operations to Zurich and a collaboration bringing Topics as a series closer to periodical status provides a growth platform for the future.
Author: Hisashi Yamamoto
Publisher: John Wiley & Sons
ISBN: 3527605355
Category : Science
Languages : en
Pages : 905
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Book Description
This is the first handbook to cover in detail all aspects of this fascinating field of chemistry. In this handy two-volume set, readers will instantly find the information they need, clearly structured according to the individual metals in the main groups, hitherto only accessible after much time-consuming research. The result is in indispensable aid for everyday work in the lab. Alongside all the classical organic reactions, this book focuses on the modern variations as well as novel, current reactions in organic synthesis that are closely linked to main group elements - both stoechiometric and catalytic. With this work the two prizewinning editors have succeeded in producing a comprehensive compendium of the main group metals as reagents for organic reactions. In short, this is a must for every organic chemist, whether as an efficient introduction to current research, for retaining an overview or for looking up detailed information.
Author: Robert E. Gawley
Publisher: Elsevier
ISBN: 0080448607
Category : Science
Languages : en
Pages : 569
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Book Description
The world is chiral. Most of the molecules in it are chiral, and asymmetric synthesis is an important means by which enantiopure chiral molecules may be obtained for study and sale. The aim of this book is to present a detailed analysis of the factors that govern stereoselectivity in organic reactions.
