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Author Gawley, Robert E.

Title Principles of asymmetric synthesis / Robert E. Gawley, Jeffrey Aubé.

Imprint [Place of publication not identified] : Elsevier, 2012.

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Location Call No. OPAC Message Status
 Axe Books 24x7 Engineering E-Book  Electronic Book    ---  Available
Edition 2nd ed.
Description 1 online resource
text txt rdacontent
computer c rdamedia
online resource cr rdacarrier
Summary 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. Authoritative glossary to aid understanding of stereochemical terminologyExplanations of the key factors influencing stereoselectivity with numerous examples, organized by reaction typeA handy reference guide to the literature of asymmetric synthesis for practitioners in the field.
Bibliography Includes bibliographical references and index.
Contents 1. Introduction, General Principles, and Glossary of Stereochemical Terms -- 2. Practical Aspects of Asymmetric Synthesis -- 3. Enolate, Azaenolate, and Organolithium Alkylations -- 4. 1,2- and 1,4-Additions to C=X Bonds -- 5. Aldol and Michael Additions of Allyls, Enolates, and Enolate Equivalents -- 6. Cycloadditions and Rearrangements -- 7. Reductions and Hydroborations -- 8. Oxidations.
Subject Asymmetric synthesis.
SCIENCE -- Chemistry -- Organic.
Asymmetric synthesis. (OCoLC)fst00819861
Asymmetrische Synthese
Genre/Form Electronic books.
Electronic book.
Added Author Aubé, Jeffrey.
ISBN 9780080448602 (electronic bk.)
0080448607 (electronic bk.)
0080914136 (electronic bk.)
9780080914138 (electronic bk.)
Standard No. AU@ 000049617977
CHBIS 009942912
CHDSB 006157730
CHVBK 30291109X
DEBBG BV042305191
DEBSZ 368578771
DEBSZ 372598102
NZ1 15189094
UKMGB 017585709

 
    
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