Author: Matthew Richard MedeirosPublisher:
ISBN:
Category :
Languages : en
Pages : 358
Book Description
Discovery and Investigation of Trialkylborane/water-mediated Radical Reactions and an Enantioselective Approach to the Securinega Alkaloids
Author: Matthew Richard MedeirosPublisher:
ISBN:
Category :
Languages : en
Pages : 358
Book Description
Enantioselective Approach to Securinega Alkaloids
Author: David González GálvezPublisher:
ISBN:
Category :
Languages : en
Pages : 221
Book Description
Stereochemistry of Radical Reactions
Author: Dennis P. CurranPublisher: John Wiley & Sons
ISBN: 3527615229
Category : Science
Languages : en
Pages : 294
Book Description
As little as a decade ago, radicals were regarded as interesting reactive intermediates with little synthetic use. However, recent results show that radicals have an enormous potential for applications in stereoselective reactions - it's all a matter of knowing what method to use and how to apply it. Three world experts in the field have combined their expertise and present the concepts to understand and even to predict the course of stereoselective radical reactions. In addition, guidelines are established which will enable the readers to plan and carry out their own stereoselective syntheses with radicals. A comprehensive list of references provides an easy access to the primary literature. The Stereochemistry of Radical Reactions is a highly topical introduction to this burgeoning field of research. Both advanced students and researchers active in the field will welcome this book as a source of concepts and ideas.
Recent Applications of Selected Name Reactions in the Total Synthesis of Alkaloids
Author: Majid M. HeraviPublisher: Elsevier
ISBN: 0128240210
Category : Science
Languages : en
Pages : 402
Book Description
Recent Applications of Selected Name Reactions in the Total Synthesis of Alkaloids includes comprehensive coverage of name reactions in the synthesis of alkaloids. This book highlights the synthesis of various alkaloids using special name reactions including the Diels-Alder, Friedel-Crafts, Heck, Mannich, Pauson-Khand, Pictet-Spengler, Sonogashira and Suzuki reactions. In this book, some selected name reactions in the total synthesis of alkaloids are covered, as they can be used as the key step/steps in the synthesis of different alkaloids exhibiting various biological activities. All chapters include an introduction, history and mechanism of the name reaction, and present the origin of the natural product and its known biological activities. The pathway to total synthesis is visually illustrated, and the focus is on the step in which a name reaction is applied. Chemists working in the area of synthetic organic chemistry will find this reference useful, as well as those working to develop novel methodologies for the synthesis of natural products in both academia and industry. This book is also beneficial to biologists, pharmacists and botanists. Includes an introduction of alkaloids, their origins and biological properties Features the applications of special name reactions as the key step in the total synthesis of featured alkaloids Covers the pathway for the synthesis of alkaloids from commercially available or easily accessible starting materials by using at least one name reaction to achieve the desired target products
Studies Toward the Enantioselective Total Synthesis of the Martinella Alkaloids
Author: Vivek BadarinarayanaPublisher:
ISBN: 9780542722608
Category : Chemistry, Organic
Languages : en
Pages :
Book Description
This dissertation consists of two parts. The first part describes the enantioselective total synthesis of martinellic acid. The Martinella alkaloids have attracted considerable attention in the synthetic community over the past few years. This interest is due in large part to their unique structure and useful biological activity (bradykinin receptor antagonist). In model systems we have successfully used the [3+2] azomethine ylide-alkene cycloaddition to construct the heterocyclic core of these alkaloids. The enantioselective approach described herein also involves the azomethine ylide-alkene cycloaddition as a key step in the total synthesis. The pyrrolo[3,2-c]quinoline core of this alkaloid was constructed in an enantioselective fashion by the elaboration of an N-aryl pyrrolidinone, which was obtained via Pd-catalyzed aryl amination reaction using a non-racemic lactam. Pirkle's chiral solvating agent was successfully used to demonstrate the stereochemical integrity of not only the N-aryl lactam (obtained by Pd-catalyzed cross-coupling) but also the cycloaddition precursor and the cycloaddition product (tetracyclic pyrroloquinoline core). The tetracyclic compound obtained via the azomethine ylide-alkene cycloaddition was elaborated to ( - )-martinellic acid in 11 steps and 6% overall yield. The second part of this dissertation describes application of several novel organometallic complexes for carrying out various organic transformations. A fluorinated tris(pyrazolyl)borato silver(I) complex catalyzes the addition of ethyl diazoacetate to benzene rings, providing norcaradienes, which undergo electrocyclization to provide the corresponding cycloheptatriene (the Bu & huml;chner reaction). These reactions are surprisingly selective for addition to the aromatic moiety rather than C-H insertion. A copper complex containing a fluorinated triazapentadienyl ligand has been used to catalyze some carbene and nitrene addition and insertion chemistry. Nitrene addition occurs rapidly and with both aryl and alkyl substituted olefins providing the corresponding aziridine. The carbene transfer reactions that were attempted include C-H insertion, O-H insertion and N-H insertion, of which the latter two were very efficient.