Sökning: "pyrrolidines"
Visar resultat 1 - 5 av 11 avhandlingar innehållade ordet pyrrolidines.
1. Pyrrolidines via Radical Cyclization
Sammanfattning : .... LÄS MER
2. Radical Cyclization Approaches to Pyrrolidines
Sammanfattning : Five-membered rings are readily prepared by 5-exo-trig radical cyclization. This thesis is concerned with novel methodology for pyrrolidine synthesis. We have synthesised selenium containing radical precursors from aziridines and α-phenylseleno ketones, and cyclized them to 2,4- and 3,4-disubstituted pyrrolidines. LÄS MER
3. Flexibility – a tool for chirality control in asymmetric catalysis
Sammanfattning : This thesis deals with the design and synthesis of ligands for asymmetric catalysis: palladium catalyzed allylic alkylations, and rho-dium and iridium catalyzed hydrogenations of olefins. Chirally flexible phosphepine ligands based on biphenyl were synthesized and their properties were studied. LÄS MER
4. Investigation of Symmetry and Electronic Effects in Asymmetric Palladium-Catalysed Allylic Substitutions
Sammanfattning : .... LÄS MER
5. Asymmetric 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides, Thiocarbonyl Ylides, and Nitrones
Sammanfattning : This thesis describes the development of methods for thepreparation of chiral non-racemic substituted pyrrolidines,tetrahydrothiophenes, and isoxazolidines. This has beenaccomplished by using asymmetric intermolecular 1,3-dipolarcycloaddition reactions of azomethine ylides, thiocarbonylylides and nitrones, respectively, with variousdipolarophiles. LÄS MER