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    Search term:"cycloadditions"

    70 matches found for cycloadditions

    Leighton’s Strained Silacycles: Powerful Enantioselective Allylation Reagents

    Leighton’s Strained Silacycles: Powerful Enantioselective Allylation Reagents Enantioselective allylation of aldehydes Practical, enantioselective allylation of acylhydrazones Enantioselective allylation of ketimines: synthesis of tertiary carbinamines Friedel-Crafts Alkylation with Acylhydrazones A...

    MacMillan Imidazolidinone OrganoCatalysts™

    Developed by Professor David MacMillan at Caltech, imidazolidinonebased organocatalysts are designed to serve as general catalysts for a myriad of asymmetric transformations. The first highly enantioselective organocatalytic Diels–Alder reaction using a chiral organocatalyst (569763) was reported in...

    Functional Biomaterials Synthesized by Double-Head Polymerization Agents

    Hua Wei1 and Suzie H. Pun2* 1Department of Chemistry, Lanzhou University, Lanzhou 730000 China 2Department of Bioengineering and Molecular Engineering and Sciences Institute University of Washington, Seattle, Washington 98195 USA *Email: spun@u.washington.edu Over the past two decades, the rapid adv...

    Azide Building Blocks for Chemical Ligation

    Aldrich ChemFiles 2010, 10.2, 6. Dr. Matthias Junkers Dr. Matthias Junkers Product Manager Email: matthias.junkers@sial.com Chemoselective ligation strategies are a key success factor for chemical biology research. Ligation techniques open pathways to fully synthetic large peptides and even proteins...

    (R)-(+)- and (S)-(–)-Stericol® New, Effective Chiral Auxiliaries

    The introduction of chirality to organic molecules through the use of auxiliaries is a basic strategy in organic chemistry. Chiral benzylic alcohols are of particular interest because they often afford useful levels of stereoselection and are generally easy to cleave. Preparation of Dichlorocyclobut...

    MacMillan Imidazolidinone OrganoCatalysts™

    Aldrich ChemFiles 2006, 6.2, 9. Product Highlights • Superior enantiocontrol in numerous transformations • High activities at low catalyst loadings • Extraordinary functional group tolerance • Asymmetric α-fluorination employed in natural product synthesis MacMillan and co-workers have created chira...

    Hydrosilylation Catalyst in Chemical Synthesis

    [Cp*Ru(MeCN)3]PF6: A Highly Efficient Hydrosilylation Catalysts Vinylsilanes are versatile organometallic reagents that participate in a variety of reaction paradigms such as Tamao–Fleming oxidation, olefin metathesis, Pd-catalyzed cross-coupling, protodesilylation, and cycloaddition. Of the availab...

    Introduction of Terminal Azide and Alkyne Functionalities in Polymers

    • • Download PDF • Dr. Joost A. Opsteen Institute for Molecules and Materials Radbound University Nijmegen, The Netherlands “Click” chemistry, and the copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) in particular, is a powerful new synthetic tool in polymer chemistry and material science. Suc...

    BINOL and Derivatives

    • • Download PDF • BINOL and its derivatives are one of the mostly widely used classes of ligands in asymmetric synthesis; being utilized in a broad array of reactions including: Diels–Alder, carbonyl addition and reductions, Michael additions, as well as many others. While tremendous success has be...

    MacMillan Imidazolidinone OrganoCatalysts

    Aldrich ChemFiles 2006, 6.7, 11. Product Highlights • Superior enantiocontrol in numerous transformations • High activities at low catalyst loadings • Extraordinary functional group tolerance MacMillan and co-workers have created chiral imidazolidinone organocatalysts that function as the linchpin i...

    Functionalized Alkynes

    Aldrich ChemFiles 2008, 8.1, 14. Alkynes contain a highly versatile functional group that may be utilized for numerous reactions such as electrophilic additions of hydrogen, halogens, hydrogen halides, or water; metathesis; hydroboration; oxidative cleavage; C–C coupling; and cycloadditions. Termina...

    Yoon Group – Professor Product Portal

    Professor Product Portal Index Professor Tehshik Yoon One major theme of research in the Yoon lab is the development of unique chemical transformations enabled by visible light photochemistry. A variety of transition metal photocatalysts responsive to visible light are known, and the Yoon lab has sh...

    Versatile Cell Culture Scaffolds via Bio-orthogonal Click Reactions

    1,2Malar A. Azagarsamy, 1Navakanth R. Gandavarapu, 1,2Kristi S. Anseth* 1Department of Chemical and Biological Engineering and 2the Howard Hughes Medical Institute, University of Colorado at Boulder, Boulder, CO 80303 Email: Kristi.Anseth@colorado.edu 1,2Malar A. Azagarsamy, 1Navakanth R. Gandavarap...

    Allenes

    Versatile building blocks with ability to participate in a diverse array of reactions The past couple of decades have witnessed a surge in the popularity of allenes as viable building blocks for a wide variety of synthetic applications.1 Their versatility allows them to participate in nucleophilic a...

    Alkyne Hydrosilylation

    • • Download PDF • Vinyl-metal reagents play a pivotal role in organic synthesis. Among the vinyl-metal reagents available, silicon-based reagents are of increasing importance. This is largely due to their low cost, minimal toxicity, ease of handling, and the simplicity of byproduct removal. Particu...

    Poly(2-Oxazoline)S: The Versatile Polymer Platform for Biomedicine

    Victor R. de la Rosa,1 An Van Den Bulcke,2 and Richard Hoogenboom1* 1Supramolecular Chemistry Group, Department of Organic and Macromolecular Chemistry Ghent University, Krijgslaan 281-S4, 9000 Ghent, Belgium 2ChemTech, Department of Organic and Macromolecular Chemistry, Ghent University Krijgslaan ...

    Applications

    Vol. 2, No. 7 Eckert's Cartridges for Safe Phosgenations Introduction / Applications / Phosgene and Substitutes / Instructions for Use / References Applications of Phosgene in Modern Synthesis Transformations Using Phosgene Phosgene is a small bifunctional molecule of high synthetic value. It is use...

    Chemistry at Surfaces with Self-Assembled Monolayers and SAMDI-ToF Mass Spectrometry

    Prof. Milan Mrksich Department of Chemistry The University of Chicago Chicago, IL mmrksich@uchicago.edu Modern synthetic chemistry permits the construction of elaborate molecular structures and has been vital to the development of pharmaceuticals, catalysts, and functional polymers. Chemists no long...

    Lithography Nanopatterning Tutorial

    Lithography Nanoimprint Lithography Soft Lithography Photochemical Acid Generators Nanopatterning Nanopatterning via Phase Separation of Polymers Self-Assembled Monolayer Systems (SAMS) Norbornadiene References Lithography, based on traditional ink-printing techniques, is a process for patterning va...

    Alkynes

    Aldrich ChemFiles 2006, 6.6, 6. Alkynes have been used for many years in the Sonogashira coupling reaction1 and related Castro-Stephens reaction,2 and have recently gained considerable interest in the Huisgen 1,3- dipolar cycloaddition with organic azides.3 Recently, Walsh demonstrated the use of te...

    Organic Azides and Azide Sources

    • • Download PDF • Since the preparation of the first organic azide, phenyl azide, by Peter Griess in 1864 this energy-rich and versatile class of compounds has enjoyed considerable interest. In more recent years, completely new perspectives have emerged, notably the use of organic azides for peptid...

    Neil Garg Group - Professor Product Portal

    Professor Product Portal Index Professor Neil Garg The Garg group develops methods for the synthesis of natural products and pharmaceuticals. One key method pertains to heterocyclic arynes, such as indolynes and pyridynes, which are generated in situ from silyltriflate precursors under mild fluoride...

    (R)-(+)- and (S)-(-)-Stericol: New, Effective Chiral Auxiliaries

    Introduction Introduction of chirality in organic molecules through the use of auxiliaries is a basic strategy in organic chemistry. Chiral benzylic alcohols are of particular interest because they often afford useful levels of stereoselection and are generally easy to cleave. The enantiomers of 1-(...

    Asymmetric Cycloaddition

    The asymmetric 1,3-dipolar cycloaddition reaction is of the utmost importance for the enantioselective synthesis of five-membered heterocycles. Cabrera et al. introduced a new family of ligands consisting of a planar chiral P,S-ligand, named Fesulphos, for the 1,3-dipolar cycloaddition of azomethine...

    Diethyl Azodicarboxylate in Chemical Synthesis

    Diethyl azodicarboxylate (DEAD), a widely used reagent, is now available again from Sigma-Aldrich. Due to increased safety regulations, domestic shipment of DEAD as a dry reagent is prohibited. Sigma-Aldrich recently achieved full compliance with UN and US DOT safety regulations and is proud to offe...

    Conjugated Polymers for the Engineering of Device/Tissue Interface

    • • Download PDF • Department of Materials Science and Engineering The University of Delaware Newark, DE 19716 *Email: milty@udel.edu There is considerable interest in the development of conjugated, electronically and ionically active polymers for interfacing active biomedical devices with living ti...

    "Click" Chemistry in (Bio)Materials Science

    • • Download PDF • 1Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, The Netherlands 2Encapson B.V, The Netherlands j.vanhest@science.ru.nl Combining biomolecules and synthetic polymers into a new class of versatile biohybrid materials with many (future) fields ...

    Chemical Ligation by Click Chemistry—A “Click” Away from Discovery

    The traditional process of drug discovery based on natural secondary metabolites has often been slow, costly, and laborintensive. Even with the advent of combinatorial chemistry and high-throughput screening in the past two decades, the generation of leads is dependent on the reliability of the indi...

    Macmillan Imidazolidinone Organocatalysts in Chemical Sythesis

    Metal-free Asymmetric Catalysis Developed by Professor David MacMillan at Caltech, imidazolidinone-based OrganoCatalysts™ are designed to serve as general catalysts for a variety of asymmetric transformations. The first highly enantioselective organocatalytic Diels-Alder reaction using (5S)-2,2,3-tr...

    Click Chemistry

    Perhaps no reaction in the click family has received more attention than the Cu(I)-catalyzed Huisgen 1,3-dipolar cycloaddition of terminal alkynes with organoazides to yield 1,4-disubstituted 1,2,3-triazoles (Scheme 1).1 True to a “good” click reaction, the reaction is reliable and high yielding, ea...