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Synthesis Of Novel Chiral Bipyrimidine Diphosphine And Aminoalcohol Ligands And Their Application In Asymmetric Catalysis
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Book Synopsis Synthesis of Novel Chiral Bipyrimidine Diphosphine and Aminoalcohol Ligands and Their Application in Asymmetric Catalysis by : Gang Chen
Download or read book Synthesis of Novel Chiral Bipyrimidine Diphosphine and Aminoalcohol Ligands and Their Application in Asymmetric Catalysis written by Gang Chen and published by . This book was released on 2003 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Novel Chiral Ligands for Catalytic Asymmetric Reactions by :
Download or read book Synthesis of Novel Chiral Ligands for Catalytic Asymmetric Reactions written by and published by . This book was released on 2006 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of N-salicyl-beta-aminoalcohol ligands had been synthesized by three component Mannich type reaction followed by ring opening of oxazolidine derivatives with hydroxylamine hydrochloride. The reactions provided a series of chiral N-salicyl-beta-aminoalcohol ligands in high yields (84-92%) without any racemization. These synthesized compounds were evaluated as ligands for catalytic asymmetric Strecker reactions. N-Benzhydrylaldimines derived from aromatic and aliphatic aldehydes reacted withTMSCN in the presence of 10 mol% of Ti-ligand complex to give the alpha-aminonitriles in excellent yields and in up to >98% ee. In addition, the catalyst loading was successfully reduced to 2.5 mol% which is very effective and extremely simple for large scale synthesis. The presence of 2-propanol is essential to ensure good conversion and reaction rate. The absolute configuration of all products derived from the (S)-ligand was confirmed to be S. Racemization of alpha-aminophenylacetonitriles is catalyzed by weak acids such as silica (SiO[subscript 2]) or even methanol. However, the racemization can be suppressed by addition of either a base such as triethylamine (NEt[subscript 3]) or strong acid such as hydrochloric acid (HCI). Importantly, optically active alpha-aminoacetonitriles can be easily converted to arylglycines by complete hydrolysis with minimal racemization. (>80% and >90% ee). A transition state model to explain the enantioselectivity of the reaction is proposed. The present chiral catalysts showed their catalytic ability in not only asymmetric strecker reaction but also asymmetric Pudovic reaction as well as asymmetric Michael addition.
Book Synopsis Chiral Diazaligands for Asymmetric Synthesis by : Marc Lemaire
Download or read book Chiral Diazaligands for Asymmetric Synthesis written by Marc Lemaire and published by Springer. This book was released on 2010-02-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of phosphine derivatives has historically induced the tremendous development of catalysis (both non-asymmetric and asymmetric). Although the chemistry of amines is more documented, the use of nitrogen-containing ligands only appeared recently. Nevertheless, during the last ten years, the results describing chiral diamine preparations and their uses in asymmetric catalysis and synthesis are increasing faster than their phosphorus counterparts. The reader will find in this volume the most recent methods for the synthesis of chiral diamines as well as their applications in asymmetric catalysis of CC bond formation. Particular attention will be given to spartein and derivatives of such diamines. Recently, the particular properties and the chemistry of amines allowed to obtain catalysts easy to separate and recycle and new types of ligands such as diaminocarbenes, ureas and thioureas. Finally, the complexing properties of some diamines allowed the formation of complexes with chirality "at the metal " which is of major theoretical interest and presents numerous potential applications.
Book Synopsis Highly Efficient Asymmetric Synthesis of Novel Diphosphine Ligands with Additional Chiral Centers on the Backbone and Their Applications in Asymmetric Hydrogenation Reactions by : Liqin Qiu
Download or read book Highly Efficient Asymmetric Synthesis of Novel Diphosphine Ligands with Additional Chiral Centers on the Backbone and Their Applications in Asymmetric Hydrogenation Reactions written by Liqin Qiu and published by . This book was released on 2003 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Asymmetric Synthesis of Chiral Bipyridine-based Ligands for Use in Asymmetric Catalysis by : David A. Regan
Download or read book Asymmetric Synthesis of Chiral Bipyridine-based Ligands for Use in Asymmetric Catalysis written by David A. Regan and published by . This book was released on 2008 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Synthesis of Chiral P, N Ligands and Their Applications in Asymmetric Catalysis by : Cian Reid
Download or read book The Synthesis of Chiral P, N Ligands and Their Applications in Asymmetric Catalysis written by Cian Reid and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Novel Chiral Dipyridylphosphine Ligands and Their Application in Ru- and Rh-catalyzed Asymmetric Hydrogenation Reactions by : Jing Wu
Download or read book Synthesis of Novel Chiral Dipyridylphosphine Ligands and Their Application in Ru- and Rh-catalyzed Asymmetric Hydrogenation Reactions written by Jing Wu and published by . This book was released on 2003 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chiral Building Blocks in Asymmetric Synthesis by : Jacek Wojaczynski
Download or read book Chiral Building Blocks in Asymmetric Synthesis written by Jacek Wojaczynski and published by John Wiley & Sons. This book was released on 2022-08-05 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chiral Building Blocks in Asymmetric Synthesis A comprehensive introduction to the important classes of chiral building blocks Chirality — the asymmetric quality found in certain chemical compounds — plays an essential role in our world: chiral compounds can be found in biology, pharmaceutical compounds, agrochemicals, and fragrances. The stereoselective preparation of these complex molecular constructions constitutes a challenge. To this end, modern asymmetric synthesis utilizes a variety of valuable and efficient reagents employed as chiral auxiliaries, metal complexes and organocatalysts in stereoselective catalysis, and enantiopure reactants termed as chiral building blocks. In Chiral Building Blocks in Asymmetric Synthesis, the achievements in the fields of preparation of and applications of chiral blocks are presented. In doing so, the book comprehensively discusses the important classes of these reactants as the key for the asymmetric synthesis of chiral molecules. As such, it is an indispensable resource about synthetic methods, as well as possible modifications and transformations of important classes of chiral compounds. It also highlights the importance of their use as reactants and auxiliaries in the preparation of more sophisticated molecules or supramolecular systems. In Chiral Building Blocks in Asymmetric Synthesis readers will also find: Organization according to the most important compound classes — e.g. amino acids, BINOL and its derivatives, terpenes, and others — with an emphasis on synthesis and application A focus on the use of chiral building blocks for the preparation of bioactive compounds and supramolecular assemblies Chiral Building Blocks in Asymmetric Synthesis is a useful reference for organic chemists, catalytic chemists, chemists in industry, medicinal chemists, pharmaceutical chemists, and the libraries that support them.
Book Synopsis Synthesis of Chiral Tetrahydroisoquinolines and Their Applications in Asymmetric Catalysis by : Patricia Dawn MacLeod
Download or read book Synthesis of Chiral Tetrahydroisoquinolines and Their Applications in Asymmetric Catalysis written by Patricia Dawn MacLeod and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Synthesis of Sugar and Amino Acid-based Chiral Ligands and Their Use in Asymmetric Catalysis by : Cheng-Wei Tom Chang
Download or read book Design and Synthesis of Sugar and Amino Acid-based Chiral Ligands and Their Use in Asymmetric Catalysis written by Cheng-Wei Tom Chang and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Towards the Synthesis of a Novel Chiral Ligand for Bismuth for Use in Asymmetric Catalysis by : Emily Drew
Download or read book Towards the Synthesis of a Novel Chiral Ligand for Bismuth for Use in Asymmetric Catalysis written by Emily Drew and published by . This book was released on 2014 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Synthesis of Novel Chiral Bisoxazoline Ligands for the Catalytic Asymmetric Allylic Oxidation by : Davoud Asgari
Download or read book Design and Synthesis of Novel Chiral Bisoxazoline Ligands for the Catalytic Asymmetric Allylic Oxidation written by Davoud Asgari and published by . This book was released on 2001 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Application of New Chiral Ligands for Enantioselectivity Tuning in Transition Metal Catalysis by : Fanji Kong
Download or read book Synthesis and Application of New Chiral Ligands for Enantioselectivity Tuning in Transition Metal Catalysis written by Fanji Kong and published by . This book was released on 2017 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: A set of five new C3-symmetric phosphites were synthesized and tested in palladium-catalyzed asymmetric Suzuki coupling. The observed reactivity and selectivity were dependent upon several factors. One of the phosphites was able to achieve some of the highest levels of enantioselectivity in asymmetric Suzuki couplings with specific substrates. Different hypotheses have been made for understanding the ligand effects and reaction selectivities, and those hypotheses were tested via various methods including DOSY NMR experiments, X-ray crystallography, and correlation of catalyst selectivity with Tolman cone angles. Although only modest enantioselectivities were observed in most reactions, the ability to synthesis these phosphites in only three steps on gram scales and to readily tune their properties by simple modification of the binaphthyl 2́-substituents makes them promising candidates for determining structure-selectivity relationships in asymmetric transition metal catalysis, in which phosphites have been previously shown to be successful. A series of novel chiral oxazoline-based carbodicarbene ligands was targeted for synthesis. Unfortunately, the chosen synthetic route could not be completed due to unwanted reactivity of the oxazoline ring. However, a new and efficient route for Pd-catalyzed direct amination of aryl halides with oxazoline amine was developed and optimized during these studies. Chiral binaphthyl based Pd(II) ADC complexes with different substituent groups have been synthesized and tested in asymmetric Suzuki coupling reactions. Although only low enantioselectivities were observed in Suzuki coupling, this represents a new class of chiral metal-ADC catalysts that could be tested in further catalytic.
Book Synopsis Synthesis and Purification of Chiral Ligands for Use in Asymmetric Catalysis by : Alexander V. Rupert
Download or read book Synthesis and Purification of Chiral Ligands for Use in Asymmetric Catalysis written by Alexander V. Rupert and published by . This book was released on 2007 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Novel Chiral Bicyclic Ligands and Their Application in Iridium-catalyzed Reactions by : Anna Trifonova
Download or read book Synthesis of Novel Chiral Bicyclic Ligands and Their Application in Iridium-catalyzed Reactions written by Anna Trifonova and published by . This book was released on 2005 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Resolution of Novel Chiral Pyridylphenols and Their Applications in Catalytic Asymmetric Addition of Diethylzinc to Aldehydes by : Huichang Zhang
Download or read book Synthesis and Resolution of Novel Chiral Pyridylphenols and Their Applications in Catalytic Asymmetric Addition of Diethylzinc to Aldehydes written by Huichang Zhang and published by . This book was released on 1996 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
