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Showing 1 to 8 of 8 for “"Asymmetrische Synthese / Katalyse"”.
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1,3-Aminoalkohole als Bausteine in der asymmetrischen Synthese von Azetidinen, Azetidincarbonsäuren und Piperidin-3-olen
Four-membered cyclic amines – the azetidines – are an original class of compounds with limited occurrence in nature. Nevertheless enantiopure azetidines and in particular derivatives of the azetidine-2-carboxylic acid are used in medicine, crop protection and asymmetric catalysis. Despite these …
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Asymmetrische Organokatalyse zu Alpha-Fluorierung von Aldehyden und Ketonen und zur Synthese von Cyclohexencarbaldehyden via Dominoreaktionen
Chiral secondary amines play a crucial role in the fast growing field of organocatalysis. Due to their two activation modes of several carbonyl compounds, namely enamine catalysis (HOMO-raising) and iminiumion catalysis (LUMO-lowering), they are capable to catalyze a broad variety of different …
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Rhodium-katalysierte, asymmetrische Synthese: Ligandendesign und Methodik
The development of new and efficient catalysts is of utterly importance for the improvement of existing reactions and the discovery of new catalytic reactions. On the one hand this PhD thesis deals with the synthesis of novel, enantiopure diphosphines and phosphine-olefin-complexes bearing a …
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Methoden zur asymmetrischen nucleophilen Glyoxylierung
Chiral alpha-ketoacids and their derivatives play an important role in organic synthesis and are widely used as inhibitors of both proteolytic enzymes as well as inhibitors of leukotriene A4 hydrolase. Furthermore they are an integral part of important biologically active ulosonic- and sialic …
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Über die Entwicklung neuer Methoden zur N-Arylierung von Sulfoximinen und die Synthese von Diarylphosphinylsulfoximinen als Liganden in der asymmetrischen Metallkatalyse
In this work, new methods for the N-arylation of sulfoximines with various aryl sources have been developed. For the first time, aryl boronic acids can be used as aryl sources with ready available copper salts as catalysts. These cross coupling reactions can be performed under mild conditions at …
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Synthese von planar chiralen Imidazoliumsalzen, ihren Metall-Carbenkomplexen und deren Verwendung in der asymmetrischen Katalyse
… derivatives. Some industrially important syntheses are amongst those processes, including the preparation of the herbicide (S)-metolachlor, which is obtained through an asymmetric hydrogenation reaction mediated by a ferrocenyldiphosphane. [2.2]Paracyclophanes constitute another important …
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Synthese neuer C 1-symmetrischer Monosulfoximine und deren Anwendung als Liganden in der asymmetrischen Katalyse
This PhD thesis describes the development of a new class of C1-symmetric monosulfoximines and their application as ligands in asymmetric catalysis. The main question, with which the research was concerned, is whether a ligand which does not possess C2-symmetry and has only one chiral sulfoximine …
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Katalytische, enantioselektive Synthesen von Diarylmethanolen und Allylalkoholen
In this research new, catalytic, enantioselective aryl transfer reactions to aldehydes for the synthesis of chiral diarylmethanols were developed. Diarylmethanols are important intermediates for the synthesis of pharmaceutically active compounds. In the foregoing research, it was found that, in …