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Showing 1 to 7 of 7 for “"Allylgruppe"”.
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Palladium-katalysierte enantioselektive Umlagerung allylischer O-Thiocarbamate
Enantioselective Rearrangement of Allylic Thiocarbamates The aim of the project was the examination of Palladium(0) catalyzed rearrangements of allylic thiocarbamates. Influences of the allylic moity ant the substituents at the nitrogen were investigated in respect to reactiontimes, enantio-meric …
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Pd-katalysierte asymmetrische Synthese allylischer Sulfone und Stereochemie der Lithiumsalze chiraler allylischer Alpha-tert-Butylsulfonyl-Carbanionen
The Pd(0)-catalyzed allylic sulfonation of allylic substrates with Lithium tert-Butylsulfinate in presence of chiral bisphospines leads to chiral allylic tert-Butylallylsulfones in high yields up to 96% and selectivities up to 98%. Deprotonation of said compounds in alpha-position to their …
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Asymmetrische Synthese funktionalisierter Homoallyl- und Homopropargylalkohole mittels der Sulfoximin-Route
This dissertation describes new methods of asymmetric synthesis of diastereomeric and enantiomeric pure allylic alcohols. Via the sulfoximine-route by Gais et al. new chiral homoallyllic alcohols were synthesized. Elimination of the sulfoximine-group lead to optically pure homopropargylic alcohols. …
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Chirale Tris(amido)titanaallylsulfoximine: Stereoselektive Hydroxyalkylierung, Struktur und Dynamik
This thesis deals with stereoselective hydroxyalkylation reactions of E- and Z-configured allylic sulfoximines. Titanation of lithiated allylic sulfoximines with chlorotrisdiethylaminotitan and subsequent reaction of the resulting mono(2-alkenyl)tris(diethylamido)titan(IV)-complexes with aldehydes …
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Asymmetrische Synthese Delta 3a,4 -ungesättigter bicyclischer Prolin-Analoga und Festphasensynthese mit vinylischen Sulfoximinen
In the first part enantiomerically pure acyclic and cyclic allylic sulfoximines were transformed to the corresponding alpha-titanated compounds and reacted with N-tert-butylsulfonyl a-imino ethyl ester to give acyclic and monocyclic protected alpha-amino acid esters in yields of 32-97%. In all …
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Palladium-katalysierte enantioselektive Synthese allylischer Thiocarboxylate und Palladium-katalysierte Deracemisierung allylischer Carbonate
The topic of this thesis is the palladium-catalyzed allylic alkylation of potassium thioacetate (KSAc) und potassium thiobenzoate (KSBz) with racemic cyclic and acyclic allylic esters having a symmetrically substituted carbon skeleton by using the Trost ligand. By this method the corresponding …
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Palladium-katalysierte kinetische Racematspaltung allylischer Carbonate mit S-Nukleophilen und enantioselektive Umlagerung allylischer O-Sulfinate : asymmetrische Synthese von allylischern Sulfiden und Sulfonen
The palladium(0) catalyzed reactions of symmetrically disubstituted racemic allylic carbonates, being either cyclic or acyclic, with 2-pyrimidinethiol in the presence of N,N'-(1R,2R)-1,2-cyclohexanediyl-bis[2-(diphenylphosphino)-benzamide] BPA as ligand proceed with excellent levels of …