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Showing 1 to 9 of 9 for “"enantioselective epoxidation"”.
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Enantioselective epoxidation catalyzed by manganese-substituted human carbonic anhydrase
… are an important class of hybrid catalysts for enantioselective, regioselective and chemoselective organic transformations. Despite several limitations associated with this type of hybrid catalysts system and their limited development relative to small molecule catalysts, significant advances …
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Enantioselective Epoxidation of Alkenes by Chloroperoxidase and the Development of a Chloroperoxidase Expression System
… in this report, is shown to catalyze the epoxidation reaction of a number of alkenes in a highly enantioselective manner with enantiomeric excesses between 50% and 97%. Good substrates were generally non-polar cis-alkenes of less than nine carbons in length. Unsubstituted terminal alkenes …
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Heterogeneous asymmetric epoxidation of cis-ethyl cinnamte over Jacobsen's catalyst immobilized in inorganic porous materials
… obtained from cis-ethyl cinnamate enantioselective epoxidation is a very important intermediate for the synthesis of taxol and taxotère, drugs used for the treatment of breast, lung, and ovarian cancer. Among several catalytic methods, the homogeneous asymmetric epoxidation reported …
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Synthese von immobilisierten Übergangsmetall-Salen-Komplexen, deren Charakterisierung und Einsatz in der enantioselektiven Epoxidierung von 1,2-Dihydronaphthalin
… characterization and use in enatioselective epoxidation of 1,2-dihydronaphthalene by Dipl.-Chem. Eugen Möllmann born in Sindi/Estonia Several transitionmetal-salen-complexes were immobilized in mesoporous materials. These were synthesized starting from commercially available X-, Y- and …
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Part 1: Lanthanum(III) Triflate-Catalyzed Cyclopropanation via Intramolecular Methylene Transfer. Part 2: Reaction Design with Aromatic Ions - Nucleophilic Acyl Substitution and Organophotoredox Catalysts
… An asymmetric cyclopropane synthesis combining enantioselective epoxidation and the methylene transfer protocol is also presented. The second chapter describes the application of aromatic cation activation for nucleophilic acyl substitution. The strategy is used to rapidly convert carboxylic …
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Distal hydrogen-bonding effects and cofacial bimetallic salen architectures for oxygen activation chemistry
… the macrocycle led to catalysts that perform enantioselective epoxidation of unfunctionalized olefins. A macrocycle with an amide, imine, and bisphenolic functionalities was also incorporated as the redox platform in the Hangman framework; the manganese complex also performed catalytic oxygen …
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The Design and Application of Ion-paired Ligands to Address Selectivity Challenges in Transition Metal Catalysed Oxygen and Nitrogen Transfer Reactions
… proof-of-concept, we chose to investigate enantioselective epoxidation, and pleasingly good reactivity was seen for a range of substrates containing hydrogen-bond donor groups although poor enantioinduction was observed in the products (<5% ee). Various troubleshooting such as alternative …
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Enantioselective ring opening reactions catalysed by heterogenized metal salen complexes
… stereo controlled synthesis of complex organic enantioselective compounds. Their use has increased dramatically with the advent of practical asymmetric catalytic methods for their synthesis. In the early nineties, Jacobsen et al. designed the chiral Schiff base complex, which to date is the most …
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Synthese neuer Furo[3,2-a]- und Pyrano[3,2-a]carbazolalkaloide
Für die Synthese neuer Furo[3,2-a]- und Pyrano[3,2-a]carbazolalkaloide wurde eine Sequenz aus oxidativer Cyclisierung verschiedener Diarylamine verwendet. Über diese Strategie konnten drei verschiedene Furo[3,2-a]carbazole dargestellt werden und aufgrund eines Vergleichs der analytischen Daten eine …