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Showing 1 to 20 of 96 for “"Michael-Addition"”.
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Michael addition of amines to α-ß unsaturated esters
<p>"The rate of Michael addition of primary amines to acrylates under different initial conditions was investigated. An acceptable agreement between different mathematical rate expressions was observed. The maximum rate was obtained in protic and polar solvents. The maximum temperature that …
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Synthesis of chiral phosphino-sulfoximines through phospha-Michael addition and their evaluation as 1,5-P,N-Ligand in asymmetric allylic alkylation
… the introduction of the phosphorus via a phospha-Michael addition with enantiomerically pure vinyl sulfoximines using diphenylphosphine and a catalytic amount of potassium tert-butoxide. The resulting phosphines were in situ treated with borane to prevent oxidation at the phosphorous atom and the …
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Fabrication, analysis, application, and characterization of core-containing microparticles and hydrophilic microfluidic devices produced via the primary- and in situ tertiary-amine catalyzed Michael addition of multifunctional thiols to multifunctional acrylates
… polymerization using the primary amine-catalyzed addition of a trithiol to a triacrylate was realized and investigated. Various core materials were microencapsulated via this technique and introduced into appropriate systems to improve the desired characteristics of the given system. In a specific …
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Design, synthesis and evaluation of organocatalysts in 1,4-conjugate additions to nitroolefins and alkylidene malonates
… activity and selectivity in 1,4-conjugate additions involving the Michael acceptor, nitrostyrene, was evaluated. Thiourea catalysts based upon the cinchona alkaloid framework were found to exhibit excellent activity and enantioselectivity (up to 95% yield and 97% ee) at loadings of 10 mol% …
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Preparation of Dehydropeptides and Their Application in the Convergent Synthesis of Peptide Conjugates
… dehydropeptide (the electrophilic handle) by Michael additions of suitable nucleophiles was developed. The C-terminal sequence of N-Ras, a number of other lipid peptides and S-linked glycopeptides were prepared through the Michael addition of corresponding thiolates to dehydropeptides. …
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Asymmetrische Synthese von Dibenzylbutan- und Dibenzylbutyrolacton-Lignanen
… application of a chiral a-aminonitrile in the Michael addition to cyclic and open-chained Michael acceptors. The emphasis of this work is the synthesis of lignans. Different lignans like dibenzylbutan lignan from Virola sebifera, (+)-hinokinin, (+)-dihydrocubebin and cubebindimethylether were …
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NH-Isoxazolidines as Organocatalysts
… as catalysts in the Diels-Alder cycloaddition reaction, the Michael addition reaction and the Aldol condensation reaction is discussed. It has been demonstrated that the NH-isoxazolidines are effective in iminium ion catalysis and act as enantioselective organocatalysts for Diels-Alder …
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Determination of the relative stereochemistry of adducts resulting from the addition lithium dienolates to Michael acceptors
The addition of the lithium dienolate of ethyl crotonate to 2-cyclopentenone was studied to determine the stereochemical outcome of this Michael addition. Proof of the stereochemistry was provided via the unambiguous synthesis and comparison of ketone 73 from norcamphor 85.
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Alternatives to [4+1] carbocyclic annulations
… investigation of the course of intramolecular Michael addition-alkylation sequence of l-phenylsulfonyl-6-carboethoxyocta-5,7-dien-2-one.
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Organisch-anorganische Hybridmonomere, Makromonomere und Polyelektrolyte für Anwendungen in der Dentalchemie
… für Dentalmatrixharze und Nanokomposite war die Michael Addition von Aminen an Acrylate und Vinylphosphonate. Desweiteren wurden hyperverzweigte Polyelektrolyte auf ihre Eignung zur Herstellung von Glasionomerzementen untersucht. Neue acrylat- und methacrylatterminierte organisch-anorganische …
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The Use of Ipso-dihydrodiols Enzymatically Derived from Benzoic Acid in Enantioselective Synthesis. Appoaches to Total Synthesis of Vinca Alkaloids
… into Diels-Alder, radical cascade, and tandem Michael addition reactions as possible routes to the family of alkaloids. Also described are the chemoenzymatic syntheses of the natural product (-)-idesolide and unnatural polyhydroxylated pyrrolidines generated from the biotransformation of …
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Topology and Telechelic Functionality Control in Polyester Design
… displayed an enhanced cohesive strength. In addition, utilization of different comonomer compositions allowed tailoring thermal and adhesive properties of low-Tg polyesters over a wide range. Biodegradable networks were synthesized for the first time using base-catalyzed Michael addition of …
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Reductive Dehalogenation by Aqueous Biochars
… analysis coupled with chemical tagging through Michael addition reactions with cysteine identified possible QN-based compounds in a�"BCs and their formula. This study laid the foundation for the potential applications of the demonstrated reactions in the engineering treatment processes. Chemical …
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