Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 7 of 7 for “"asymmetric organocatalysis"”.
-
Novel sulfur containing electrophiles in asymmetric organocatalysis
Three different kinds of sulfur containing electrophiles in organo- and metal catalyzed reactions have been evaluated. We demonstrated the first diastereoselective reaction of beta-keto esters with 1-chloroethylphenyl sulfide catalyzed by cinchona alkaloids. At the same time, we could confirm the …
-
ASYMMETRIC ORGANOCATALYTIC HENRY REACTION OF β–SUBSTITUTED α-KETO ESTERS VIA DYNAMIC KINETIC RESOLUTION
… a brief historical background and development of asymmetric catalysis. Particularly, the asymmetric organocatalysis is introduced in detail. Then the historical background and development of dynamic kinetic resolution are summarized, especially, those organocatalytic methods are introduced in …
-
Design and Synthesis of Chiral Triazolium and Thiazolium Salts Incorporating Hydrogen-Bonding Motifs as Organocatalysts
… condensation is the rst reported example of organocatalysis, and has been studied and used in organic synthesis for over 200 years. Originally catalysed by the cyanide anion, the reaction can also proceed with thiamine as a catalyst. Since then, many N- heterocyclic carbene (NHC) catalysts …
-
Neue Heterazoliumsalze aus Prolin und Pyroglutaminsäure und Anwendungen in Carben-katalysierten asymmetrischen nucleophilen Acylierungen
… carbene. Consequently, enzyme mimetic asymmetric catalytic processes that are mediated by nucleophilic carbenes in vitro as, for instance, the benzoin condensation, the Stetter and other related nucleophilic acylation reactions have taken their place in the growing field of asymmetric …
-
Novel Enantiopure ß-Amino Alcohols and ß-Amino Thiols in Asymmetric Catalysis
… in organic chemistry, this work concentrated on asymmetric catalysis. Moreover, a major focus was on asymmetric organocatalysis as there have been tremendous successes in this field during the last years. This is in accordance with the current trends in the modern chemical research, which is …
-
Single electron studies of acylammonium intermediates, zinc-mediated carboxylations in flow, and the total synthesis of (–)-inthomycin C.
For the past two decades, the synthetic utility of chiral ⍺,𝛽-unsaturated acylammonium salts has led to the development and disclosure of unique, multibond forming, organocascade reactions, all of which have proceed through two-electron, polar pathways. This has led our group to begin exploring the …
-
Sintesi di molecole organiche enantiomericamente arricchite con l'uso della catalisi organica
The main topic of this thesis is the use of organocatalysis to synthesize organic compounds enantiomerically enriched. The first matter is about the synthesis of α-amino thioester derivatives through a tandem condensation-intramolecular rearrangement-protonation, this is a conceptually novel chiral …