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Showing 1 to 20 of 97 for “"Dienes"”.
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Cycloaddition studies in steroidal 14,16-dienes
… synthesising ring D-substituted steroidal 14,16-dienes. The aim was to explore the scope for carrying out cycloaddition reactions, and exploiting the built-in bridge substituents of derived 14,17-cycloadducts, for eventual conversion into bridge-functionalised 19-norsteroids.
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Photoinitiated coupling of dienes and monoolefins with pentacarbonyliron
… in a 1-a,4-6-n3 fashion. Using various 1,3- dienes and monoolefins carrying methyl and carboalkoxy substituents, the wide applicability of this process is demonstrated.
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Ruthenium-Catalyzed Transformations for the Synthesis of Conjugated Dienes
… and alkenes for the formation of conjugated dienes is briefly discussed. Specifically, a synopsis of ruthenium-hydride catalysis for the formation of 1,3-dienes is presented. </p> <p> The development of the trans-silylvinylation of internal alkynes with acrylates and vinyl boronates to form …
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SYNTHESES AND METAL MEDIATED REACTION CHEMISTRY OF 2-SILYL-1,3-DIENES
Asymmetric carbon-carbon bond forming processes and catalytic one-pot reactions remain challenges in organic synthesis. Since the discovery of the Diels-Alder reaction over eighty years ago, it has been one of the most important tools for synthetic organic chemists to synthesize as many as three …
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Cobalt(II) Catalyzed Asymmetric Hydrovinylation of Alkyl- and Trialkylsilyloxy-1,3-Dienes
… of alpha-olefins with aryl alkenes and 1,3-dienes. The hydrovinylation reaction, the formal addition of a hydrogen atom and an alkene across a pi-system, is an atom economical reaction that allows for the synthesis of value-added products from simple commodity chemicals and feedstock gases. …
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Cyclization and cyclopolymerization of silicon-containing dienes ; Functionalization of carbosilane dendrimers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1997.
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2-Silicon-Substituted 1,3-Dienes: Participants in Diels-Alder Chemistry and Metal-Mediated Processes
… synthesis and use of 2-silicon-substituted 1,3-dienes to alleviate these problems. These dienes, whether utilized as reagents or intermediates, serve as synthons for less reactive/selective 2-aryl 1,3-dienes.
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Underutilized Dineophiles: Asymmetric Diels-Alder Reaction of Ynones and Ynoates with Oxygen-Functionalized Dienes
… focus is on the use of oxygen-functionalized dienes in an enantioselective Diels-Alder reaction using ynones and ynoates (Figure A1).The proposal is to use electron-rich dienes, similar to Danishefsky's diene, in order to generate 1,4-cyclohexadienes that have functional groups that can take …
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Enantioselective (Formal) Aza-Diels-Alder Reactions with Danishefsky's Diene and Non-Danishefsky Type Dienes
… with Danishefsky's diene and non-Danishefsky's dienes to generate these biologically important heterocycles. To further prove the power of this method to access complex piperidine structures, we have accomplished the efficient enantioselective synthesis of the drug target casopitant.
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Catalytic osmylation of dienes : mechanistic studies and applications to the stereoselective synthesis of polyols
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1991.
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Synthesis Of 2-Boron Substituted-1,3-Dienes And Their Diels-Alder/Suzuki Cross Coupling Reactions
Dissertation under the direction of Mark E. Welker, Ph.D., Professor of Department of Chemistry, Wake Forest University
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Synthesis and application of chiral dienes and chiral imidates as ligands for transition metal catalysis
… chiral disubstituted bicyclo[2.2.1]heptadienes (R= i-Bu, c-Hex, Benzyl and allyl) starting from enantiomerically pure bistriflate. The synthesized diene ligands were tested in the rhodium(I)-catalyzed 1,4-addition of phenylboronic acids to cyclic enones (up to 96% ee) and α-acetamido …
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Copper-Catalyzed Amino Oxygenation of Alkenes and Dienes: A Novel Amino-Initiation Pathway Using O-Benzoylhydroxylamines
… three-component amino oxygenation reaction of dienes was also found to proceed effectively in a chemo-, regio-, and site-selective fashion.</p>
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