N Sulfonated N Heterocycles
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N Sulfonated N Heterocycles
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Author : Galal H. Elgemeie
language : en
Publisher: Elsevier
Release Date : 2022-08-30
N Sulfonated N Heterocycles written by Galal H. Elgemeie and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-08-30 with Science categories.
N-Sulfonated-N-Heterocycles covers the synthesis, chemistry and biological applications of these compounds, focusing on pioneering synthetic approaches, mechanistic insights and their limitations, as well as recent advances in this field. The synthesis of some of N-sulfonated N-heterocycles and their transformation to other useful cyclic and acyclic compounds are discussed, as well as their uses as useful intermediates in the preparation of polymeric and medicinal materials. This book includes detailed methods and protocols, and the focus on applications makes this resource an essential guide for all researchers in the area of organic, medicinal and polymeric synthetic study. Reviews the use of N-sulfonated N-heterocycles as important precursors for the synthesis of biologically active compounds Includes information on synthetically useful transformations of N-sulfonated N-heterocycles Covers a wide synthetic methods used for an important branch of heterocycles and their biological evaluation in detail Features over 500 schemes to illustrate different synthetic pathways and reactions of N-sulfonated N-heterocycles
N Heterocycles
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Author : Keshav Lalit Ameta
language : en
Publisher: Springer Nature
Release Date : 2022-04-23
N Heterocycles written by Keshav Lalit Ameta and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-04-23 with Science categories.
This book presents an overview of the recent advancements for the synthesis of small- and medium-sized azaheterocycles, including pyrroles, indoles, pyrimidines, pyridines, pyrrolidines, imidazoles, pyrazoles, pyrazolines, lactams, and 1,2,3-triazoles, which are significant scaffolds for compounds with pharmaceutical uses. The book also discusses various properties and performance attributes of azaheterocycles including their bioactivity and synthetic strategies. Given the contents, the book will be a valuable reference for students, researchers, and professionals interested in organic synthesis and medicinal chemistry.
More Synthetic Approaches To Nonaromatic Nitrogen Heterocycles 2 Volume Set
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Author : Ana Maria Faisca Phillips
language : en
Publisher: John Wiley & Sons
Release Date : 2022-04-11
More Synthetic Approaches To Nonaromatic Nitrogen Heterocycles 2 Volume Set written by Ana Maria Faisca Phillips 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 2022-04-11 with Science categories.
More Synthetic Approaches to Nonaromatic Nitrogen Heterocycles An authoritative collection of resources discussing the latest trends in the synthesis of nonaromatic nitrogen heterocycles Widely distributed in nature, nitrogen heterocycles are extremely common in synthetic substances found in pharmaceuticals, agrochemicals, and materials. The literature is evolving rapidly and explores newly emerging structures and medicines. More Synthetic Approaches to Nonaromatic Nitrogen Heterocycles offers R&D professionals the opportunity to easily access a collection of the latest relevant research in the area. In the second two-volume set of this practical reference distinguished researcher Dr. Ana Maria M. M. Faisca Phillips delivers a collection of resources focusing on the newest and most widely applicable trends emerging in synthetic strategies for nonaromatic nitrogen heterocycles. With coverage of topics including organocatalysis, cascade reactions, flow chemistry in synthesis, cycloaddition reactions, metathesis, cross-coupling reactions, and electrochemistry, the book provides quick access to critical new avenues of synthesis. More Synthetic Approaches to Nonaromatic Nitrogen Heterocycles: Volume 1 and 2 also offers readers: A thorough introduction to recent advances in the design and synthesis of cyclic peptidomimetics Comprehensive explorations of fused heterocycles and transition metal promoted synthesis of isoindoline derivatives Practical discussions of 1,4-diazepane ring-based systems and recent advances in the synthesis of azepane-based compounds In-depth examinations of strained aziridinium ions, asymmetric organocatalysis in alternative media, and the electrochemical synthesis of non-aromatic N-heterocycles Perfect for academic and industrial researchers in organic chemistry and synthesis, organometallic chemistry, pharmaceutical chemistry catalysis, and sustainable chemistry, More Synthetic Approaches to Nonaromatic Nitrogen Heterocycles: Volume 1 and 2 is an indispensable reference for anyone seeking an authoritative source of information on new and emerging trends in synthesis.
Applications Of N Heterocycles In Electrically And Ionically Conductive Polymers
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Author : Brent Carl Norris
language : en
Publisher:
Release Date : 2010
Applications Of N Heterocycles In Electrically And Ionically Conductive Polymers written by Brent Carl Norris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The covalent bond formed between a N-heterocyclic carbene and an aryl-isothiocyanate was discovered to be thermally-reversible. This bond was incorporated into the backbone of an aromatic polymer which, when subjected to heat and excess monomer, would depolymerize to smaller oligomers. In addition these small molecules contain active chain ends and could be repolymerized to reform the original polymer. The high molecular weight material was made into freestanding sheets with desirable mechanical properties and could be made conductive by treatment with iodine. A new poly(triazene) was formed from the reaction of a facially opposed, annulated, bis-N-heterocyclic carbene (NHC) and an organic bis-azide. The NHC as well as the azide were varied and combined to produce a series of polymers which were characterized by GPC, TGA, and NMR. These thermally robust polymers were also coated onto glass slides and rendered electrically conductive by exposure to iodine vapor. A new reagent for Reversible Addition Fragmentation Chain Transfer Polymerization (RAFT) is described. This imidazolium based reagent shows unusually fast kinetics which allows it to control polymerizations at significantly reduced loadings compared to the more traditional neutral dithiocarbamates or dithioesters. The fast kinetics is explained by the rapid rotation of the dithioester about the plane of the cationic N-heterocycle. Sulfonated poly(ether ether ketone) (sPEEK) membranes were blended with imidazoles with varying pKas. The proton conductivity of the membranes was evaluated as a function of pKa and temperature. Interestingly, the conductivity of the dry membranes showed a non-monotonous profile over a temperature range of 25 - 150 °C. We use a theoretical model to better understand the mechanistic origins of the observed temperature-conductivity profiles. This model is based on the reaction equilibria between sPEEK's sulfonic acid groups and the basic sites of the added heterocycles. Using the copper-catalyzed 1,3-dipolar "click" cycloaddition reaction, poly(sulfone)s containing pendant azide moieties were functionalized with various amounts of sodium 3-(prop-2-ynyloxy)propane-1-sulfonate and crosslinked with 1,7-octadiyne. The degree of sulfonation as well as the degree of cross-linking was systematically varied by changing the ratios of the aforementioned reagents. The polymers were cast into membranes, acidified, and then tested for proton conductivity, methanol permeability, and membrane-electrode assembly (MEA) performance.
Modern Approaches To The Synthesis Of O And N Heterocycles
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Author : Teodoro S. Kaufman
language : en
Publisher:
Release Date : 2007-01-01
Modern Approaches To The Synthesis Of O And N Heterocycles written by Teodoro S. Kaufman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-01-01 with Heterocyclic chemistry categories.
The O- and N- heterocycles are widely found in natural products as well as in pharmaceuticals and other fine chemicals, and many heterocycles have additional interest from their structural, mechanistic or biological points of view. Driven by this ubiquitous occurrence of the O- and N- heterocycles, their economic importance and academic significance, the already rich and imaginative chemistry of these compounds is still growing at a steady pace. In this three-volume publication, more than thirty groups of expert chemists from different latitudes covering four continents and twenty countries and nationalities, including Argentina, Australia, Belgium, Brazil, Bulgaria, Canada, China, Czech Republic, France, Germany, Hungary, India, Ireland, Italy, Jordan, Poland, Russia, Slovenia, Spain, and United States, provide exhaustive, well documented and up-to-date reviews on their fields of research. These contributions cover different aspects of the modern chemistry of O- and N- heterocycles, reflecting its state of the art in various specific areas of research; in addition, personal accounts are also provided by many scientists, reporting the most relevant contributions in specific areas and recent advances of their own research. Many of the most important heterocycles are included in the publication. The exhaustively referenced reviews have been arranged trying to follow a set of arbitrary criteria, which included the heteroatom(s) involved, the size of the rings, the number of rings and the structural complexity of the products; the use of specific starting materials, reagents or techniques and the access to specific products has also guided the classification process. Analogous criteria have been employed in order to arrange the chapters within each volume. In general, chapters have been systematically arranged in order of increasing ring size and structural complexity of the different target molecules, from the small sized aziridines up to macroheterocycles and heterocyclic-based dendrimers. Additional space was reserved for new methodologies for the synthesis of O- and N-heterocycles, such as solid-supported and microwave-assisted organic synthesis and flash vacuum pyrolysis and the use of specific transformations in the synthesis of O- and N-heterocycles, such as ring closing metathesis, 1,3-dipolar cycloadditions and the Paulson-Khand reaction. The Editors gratefully acknowledge the extra time, effort and kind cooperation of all of the contributing authors and their co-workers, which have greatly helped putting forward this publication, and hope this book will constitute not only a convenient means for updating specific areas of the synthetic chemistry of O- and N-heterocycles, but also an important reference for ongoing research and a useful starting point for new and original projects and chemical developments.
Ring Nitrogen And Key Biomolecules
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Author : E.G. Brown
language : en
Publisher: Springer
Release Date : 2012-09-27
Ring Nitrogen And Key Biomolecules written by E.G. Brown and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-27 with Science categories.
The nitrogen-containing ring structures are at the hub of metabolism and include ATP, nucleic acids, many coenzymes, metabolic regulators and integrators such as adenosine and GTP, signalling compounds such as cyclic nucleotides and plant cytokinins and biochemically functional pigmets of which haemoglobin, the cytochromes and chlorophyll are examples. This important book collates and integrates current knowledge of all the biologically important N-heterocyclic compounds, covering the relationship between their chemical structures and physiological functions within this key group of compounds. Few biochemical reaction sequences do not involve one of these compounds as a substrate, product or coenzyme and a full understanding of the interrelationship between their structure and function is vital for all those woorking in the field of biochemistry. Professor Eric Brown who has a huge wealth of experience in teaching and research on these compounds has written a very comprehensible and thorough book which will be of great value for advanced students and researchers in biochemistry and those at the interfacing subject areas of chemistry, biology and pharmacology including all those employed in researching biological function within pharmaceutical companies.
Synthesis Of Five Membered N Heterocycles And Their Biologically Active Derivatives A Dissertation
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Author : Mohammed Abid
language : en
Publisher:
Release Date : 2007
Synthesis Of Five Membered N Heterocycles And Their Biologically Active Derivatives A Dissertation written by Mohammed Abid and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Heterocyclic compounds categories.
New Approaches For The Stereoselective Synthesis Of N Heterocycles
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Author : Mark Daly
language : en
Publisher:
Release Date : 2012
New Approaches For The Stereoselective Synthesis Of N Heterocycles written by Mark Daly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Heterocyclic compounds categories.
A stereoselective approach has been developed for the flexible synthesis of substituted 2-pyrrolidones and 2-piperidones. By employing the key Overman rearrangement, efficient transfer of stereochemistry was achieved, and an acylation and ring closing metathesis strategy afforded a library of target N-heterocycles. In addition, the optimisation of a synthesis of 4-oxopipecolic acid derivatives from L-aspartic acid was investigated. A novel, milder and higher yielding 6-endo-trig cyclisation procedure was developed. This allowed for the generation of a library of 2,6-cis-substituted 4-oxopipecolic derivatives. Stereoselective carbonyl reduction extended the synthesis further to include 4-hydroxypipecolic acid derivatives.
Novel Synthesis Of N Heterocycles
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Author : Damian Gordon Dunford
language : en
Publisher:
Release Date : 2010
Novel Synthesis Of N Heterocycles written by Damian Gordon Dunford and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Chemistry, Organic categories.
Green Synthetic Approaches For Biologically Relevant Heterocycles
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Author : Goutam Brahmachari
language : en
Publisher: Elsevier
Release Date : 2021-02-26
Green Synthetic Approaches For Biologically Relevant Heterocycles written by Goutam Brahmachari and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-26 with Science categories.
Green Synthetic Approaches for Biologically Relevant Heterocycles, Second Edition, Volume Two: Green Catalytic Systems and Solvents reviews this significant group of organic compounds within the context of sustainable methods and processes, expanding on the first edition with fully updated coverage and a whole range of new chapters. Volume Two explores green catalytic systems and solvents and the techniques surrounding this approach, including metal and magnetic catalysis to organocatalysis and solid acid catalysis, cycloaddition reactions, and varied approaches using ionic liquids. This updated edition is an essential resource on sustainable approaches for academic researchers, R&D professionals, and students working across medicinal, organic, natural product and green chemistry. Provides fully updated coverage of the field with an emphasis on sustainability Highlights a range of different eco-friendly solvents and environmentally-friendly catalysts Collates the experience of a global team of expert contributors