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    Search term:"coupling_reactions"

    188 matches found for coupling_reactions

    Boronic Acids Reagents for Suzuki Coupling

    Vol. 3, No. 3 Reagents for Suzuki Coupling Download PDF Introduction / Boronic acids / Boronic acid Esters / Diboron Esters Potassium Trifluoroborates / OSVB, Volume 3: Suzuki Coupling Boronic acids Most boronic acids readily undergo dehydration reactions to give a cyclic (trimer) anhydride. Our sel...

    Stephen Buchwald Group – Professor Product Portal

    Professor Product Portal Index Professor Stephen Buchwald The Buchwald group has developed a series of highly active and versatile palladium precatalysts and biarylphosphine ligands used in cross-coupling reactions for the formation of C-C, C–N, C–O, C–F, C–CF3, and C–S bonds. The ligands are electr...

    Diboron Esters Reagents for Suzuki Coupling

    Vol. 3, No. 3 Reagents for Suzuki Coupling Download PDF Introduction / Boronic acids / Boronic acid Esters / Diboron Esters Potassium Trifluoroborates / OSVB, Volume 3: Suzuki Coupling Diboron Esters The following diboron esters are versatile reagents that couple with organic triflates and halides t...

    Ester

    Vol. 3, No. 3 Reagents for Suzuki Coupling Download PDF Introduction / Boronic acids / Boronic acid Esters / Diboron Esters Potassium Trifluoroborates / OSVB, Volume 3: Suzuki Coupling Boronic Acid Esters The synthesis of biaryl compounds via the Suzuki coupling reaction has become more commonplace ...

    Broad Application Doyle Nickel Precatalyst

    In modern transition metal-catalyzed coupling reactions, palladium has asserted its place as a dominant impetus. In comparison to previously used nickel catalysts, Pd(0) has been a proven precatalyst with diversity, accessibility, and robustness. However, Ni(0) has unique potential as it is more ele...

    MIDA Boronates for Suzuki–Miyaura Cross-Couplings

    Aaron Thornton, Ph.D. Product Manager aaron.thornton@sial.com Professor Martin Burke and coworkers recently prepared retinal using key MIDA building block BB1 in iterative Suzuki-Miyaura cross coupling reactions (Scheme 1). The MIDA unit of BB1 is unreactive under these conditions, allowing for the ...

    Non-Proprietary Phosphine Ligands - Technical Article

    • • Download PDF • In the pharmaceutical industry, Pd-catalyzed processes have frequently been relied on for carrying out key bond formations. While there are many ligands that efficiently mediate C–C and C–N bond formations, there is still a need for ligands that address the gaps in the current met...

    Pd-Catalyzed Synthesis of Ar-SCF3 Compounds under Mild Conditions-

    We report the first example of a coupling reaction of chiral secondary boronic esters generated by the hydroboration of vinyl arenes. In order for the reaction to take place in high yields, the use of silver oxide as a base and the presence of at least 8 equiv of triphenyl phosphine per Pd are requi...

    Rational and Predictable Chemoselective Synthesis of Oligoamines via Buchwald-Hartwig Amination of (Hetero)Aryl Chlorides Employing Mor-DalPhos

    We report our studies on the use of two catalyst systems, based on the ligands BrettPhos and RuPhos, which provide the widest scope for Pd-catalyzed C-N cross-coupling reactions to date. Often low catalyst loadings and short reaction times can be used with functionalized aryl and heteroaryl coupling...

    Iodinated Building Blocks

    Aldrich ChemFiles 2010, 10.3, 15. Iodine-containing substrates are valuable building blocks for a diverse array of synthetic methodologies. They have the ability to participate in various cross-coupling reactions for the generation of carbon–carbon, carbon–nitrogen, and carbon– oxygen bonds. Often i...

    MIDA-protected Boronate Esters

    • • Download PDF • Product Manager The Suzuki-Miyaura cross-coupling reaction is one of the most important and highly utilized reactions in organic chemistry, with applications in polymer science as well as in the fine chemicals and pharmaceutical industries. However, some classes of boronic acids a...

    TEMPO Catalyzed Oxidations

    TEMPO (2,2,6,6-Tetramethylpiperidinyloxy or 2,2,6,6-Tetramethylpiperidine 1-oxyl) and its derivatives are stable nitroxy radicals used as catalysts in organic oxidation reactions. TEMPO was discovered by Lebedev and Kazarnovskii in 1960. The stable free radical nature of TEMPO is due to the presence...

    Reference Books

    Vol. 2, No. 1 Products for Suzuki Coupling Download PDF (1.03 MB) Introduction / Boronic Acids / Boronic Acids Esters / Diboron Esters / Prolines & Pyroglutamates Transition-Metal Catalysts / Palladium Scavengers / Large-Scale Suzuki Coupling / Reference Books Reference Books Organic Syntheses via B...

    J.S. Johnson Group - Professor Product Portal

    Professor Product Portal Index Professor Jeffrey S. Johnson The Johnson group has developed a family of reagents that are useful for the modular preparation of highly substituted glycolic acid derivatives. Silyl glyoxylates are potent electrophiles by virtue of being α-dicarbonyls, and react with a ...

    Stereospecific Cross-Coupling of Secondary Organotrifluoroborates: Potassium 1-(Benzyloxy)alkyltrifluoroborates

    The synthesis of potassium trifluoro(N-methylheteroaryl)borates and their use in cross-coupling reactions with various aryl and heteroaryl halides to construct N-methyl heteroaryl-substituted aromatic and heteroaromatic compounds are reported. A 10 mL microwave vial equipped with a stirrer bar was c...

    Boronic Acid Esters

    The synthesis of biaryl compounds via the Suzuki–Miyaura coupling reaction has become more commonplace now that many arylboronic acids are readily available. Several years ago, Miyaura et al. demonstrated the utility of cyclic pinacol esters of arylboronic acids in Suzuki–Miyaura coupling reactions....

    Nickel Precatalysts

    Suzuki-Miyuara couplings have been widely commonplace in the formation of C-C bonds, in particular the coupling between two heteroaryl compounds. For the most part, palladium has been the dominant choice of metal catalyst to carrying out cross-coupling reactions between heteroaryl boronic acids and ...

    Solvias® Ligand Portfolio for Enantioselective Hydrogenation

    Hans-Ulrich Blaser, Garrett Hoge, Matthias Lotz, Benoît Pugin, Anita Schnyder and Felix Spindler Solvias AG, P.O. Box, CH-4002 Basel, Switzerland Contact: Dr. Garrett Hoge, Product Manager Catalysis, garrett.hoge@solvias.com Today's Solvias Ligand Portfolio has its roots in the development of the Jo...

    Development of Organic Semiconductors from Highly Ordered Oligo and Polythiophenes

    Nicholas S. Colella, Lei Zhang, Alejandro L. Briseño* Polymer Science & Engineering Department, University of Massachusetts, Amherst, Massachusetts 01003 *Email: abriseno@mail.pse.umass.edu The soaring global demand for energy, coupled with the limited supply of fossil fuels, has increased the need ...

    PTS—New Amphiphile for Metathesis and Cross-Coupling in Water

    Recently introduced by Professor Bruce Lipshutz of UC, Santa Barbara, polyoxyethanyl α-tocopheryl sebacate (PTS) is a nonionic amphiphile that is proving to be a versatile “solubilizer” for organic molecules in water.1 (698717) Lipophilic substrates and catalysts can efficiently enter micelles forme...

    Boronic Acids for Suzuki Coupling Reactions

    Vol. 2, No. 1 Products for Suzuki Coupling Download PDF (1.03 MB) Introduction / Boronic Acids / Boronic Acids Esters / Diboron Esters / Prolines & Pyroglutamates Transition-Metal Catalysts / Palladium Scavengers / Large-Scale Suzuki Coupling / Reference Books Boronic Acids Aldrich is pleased to pre...

    ChemDose Applications and Advantages

    . Convenient Dosing of Catalysts and Reagents . Advantages . Representative Application . Frequently Asked Questions (FAQs) . Technical Information for Download (PDF format) . Materials List ChemDose® is a novel technology allowing for the use of chemical reagents and catalysts in the form of tablet...

    Selective Monoarylation of Acetate Esters and Aryl Methyl Ketones Using Aryl Chlorides

    A series of palladacyclic precatalysts that incorporate electron-rich di-tert-butylphosphino biaryl ligands is reported. These precatalysts are easily prepared, and their use provides a general means of employing bulky ligands in palladium-catalyzed cross-coupling reactions. The application of these...

    Catalysis Guide

    • Highly Selective Palladium-Catalyzed Cross-Coupling of Secondary Alkylzinc Reagents with Heteroaryl Halides • Palladium-Catalyzed Amination of Unprotected Five-Membered Heterocyclic Bromides • Stereospecific Pd-Catalyzed Cross-Coupling Reactions of Secondary Alkylboron Nucleophiles and Aryl Chlori...

    Sigma-Aldrich Chemistry Webinars

    Sigma-Aldrich Chemistry Webinars are Web-based seminars describing the latest, innovative chemical synthesis technologies and products from Sigma-Aldrich Chemistry. These seminars are convenient to navigate, interactive, and accessed directly via your desktop browser. 2016 From Milligrams to Kilogra...

    New Trifl uoroborate Salts for Suzuki Coupling from Aldrich R&D

    Aldrich ChemFiles 2005, 5.5, 11. Trifluoroborates are air-stable alternatives to boronic acids in palladium-catalyzed Suzuki–Miyaura cross-coupling reactions.1,2 They are more robust, easier to handle, and less prone to protodeboronation.1 They display a remarkably uniform behavior.2 back to top 1. ...

    Pd(PhCN)2Cl2/P(t-Bu)3: A Versatile Catalyst for Sonogashira Reactions of Aryl Bromides at Room Temperature

    The Suzuki-Miyaura cross-coupling of unprotected, nitrogen-rich heterocycles using precatalysts P1 or P2 is reported. The procedure allows for the reaction of variously substituted indazole, benzimidazole, pyrazole, indole, oxindole, and azaindole halides under mild conditions in good to excellent y...

    Phosgene

    Aldrich ChemFiles 2007, 7.2, 4. Phosgene is an extremely versatile reagent allowing easy access to isocyanates, ureas, carbamates, carbonates, acyl and alkyl chlorides.1 Many of these can be used as reactive intermediates in peptide coupling reactions. As a dehydrating agent, phosgene can also lead ...

    Procedures for Transition-Metal-Catalyzed Cross-Coupling Reactions

    TPGS-750-M, DL-α-Tocopherol methoxypolyethylene glycol succinate, is a designer surfactant composed of a lipophilic α-tocopherol moiety and a hydrophilic PEG-750-M chain, joined by an inexpensive succinic acid linker. TPGS-750-M spontaneously forms micelles upon dissolution in water. The balance and...

    Transition Metal Catalysts

    Vol. 2, No. 1 Products for Suzuki Coupling Download PDF (1.03 MB) Introduction / Boronic Acids / Boronic Acids Esters / Diboron Esters / Prolines & Pyroglutamates Transition-Metal Catalysts / Palladium Scavengers / Large-Scale Suzuki Coupling / Reference Books Transition-Metal Catalysts A variety of...