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Showing 1 to 10 of 10 for “"Stetter"”.
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Development of a catalytic enantioselective intramolecular Stetter reaction: catalyst development and synthetic applications
… enantioselective intramolecular Stetter reaction has been developed. The process involves direct conversion of an aldehyde into a chiral acyl anion equivalent and its addition into a pendant electron-deficient olefin. The development of chiral bicyclic nucleophilic carbene …
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Entwicklung von Carben-katalysierten asymmetrischen intermolekularen Stetter-Reaktionen und direkt gekreuzter intermolekularer Benzoin-Reaktionen
… employed in the asymmetric intermolecular Stetter reaction. The resulting 1,4-diketones were obtained in moderate to excellent yields (49-98%) and good enantioselectivities (56-78% ee). For several Stetter products the enantiomeric excess could be enhanced by a single recrystallization up …
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The Stetter reaction : synthesis of complex spiro Bis-indanes and studies on quaternary centre formation
This work covers recent advances in the Stetter reaction, including two novel domino Stetter reactions and preliminary studies on quaternary center formation via the intermolecular Stetter reaction. The N-heterocyclic carbene (NHC) catalyzed domino Stetter-aldol-Michael dimerization of o-formyl …
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Preparation of Novel Carbenes and their Catalytic Application to the Cross-Benzoin, Aza-Benzoin and Stetter Reactions
… (BACs) generated in situ were screened in the Stetter reaction. Among those tested, bis(diethylamino)cyclopropenylidene (EtBAC) was found to be the most efficient BAC catalyst for the Stetter reaction. EtBAC was also found to be superior to common NHCs in reactions with β-alkyl ketone acceptors …
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Carbene catalyzed asymmetric nucleophilic acylations with novel triazolium salts
… the benzoin condensation and intramolecular Stetter reaction. The optimal conditions were identified and allowed for an expansion of the reaction scope with 8-95% yield and enantiomeric excesses of 21-95% in the benzoin condensation. Furthermore, these carbene precatalysts have been applied …
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Neue Heterazoliumsalze aus Prolin und Pyroglutaminsäure und Anwendungen in Carben-katalysierten asymmetrischen nucleophilen Acylierungen
… as, for instance, the benzoin condensation, the Stetter and other related nucleophilic acylation reactions have taken their place in the growing field of asymmetric organocatalysis. The synthesis of new carbene catalysts remains an important task aimed at the development of new reactions as well …
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Design and Synthesis of Chiral Triazolium and Thiazolium Salts Incorporating Hydrogen-Bonding Motifs as Organocatalysts
… to be effective at obtaining yield and ee in the Stetter reaction. These catalysts are critically analysed, future work proposed.
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The Western Kentucky University Teaching Gardens: Landscape Design and Establishment Plan
<p>The purpose of this thesis is to design a landscape plan for Teaching Gardens at the Western Kentucky University Agriculture Research and Education Center. The landscape plans were selected based upon the available 5.3 acres surrounding the greenhouse, vineyard, and Exposition Center. Planning …