5 research outputs found

    Darstellung und Einsatz von Oxyenamiden in der stereoselektiven Synthese

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    Trotz der beträchtlichen Fortschritte in der organischen Synthese in den letzten Jahrzehnten ist der rasche und selektive Aufbau von Molekülen mit mehreren stereogenen Zentren nach wie vor eine große Herausforderung für jeden Chemiker. Insbesondere für pharmazeutische Anwendungen ist die präzise Kontrolle der absoluten und relativen Konfiguration von entscheidender Bedeutung, da die biologischen Eigenschaften von Arzneimitteln unmittelbar davon abhängig sind. Aus diesem Grund besteht ein dringender Bedarf, effiziente Methoden für die Darstellung von strukturell komplexen Molekülen, wie bspw. 1,3-Diamino-2-olen oder Tetrahydrochinolinen, zu entwickeln (Schema I). Eine retrosynthetische Betrachtung dieser Motive ergab, dass 2-Oxyenamide nützliche Bausteine für dieses Vorhaben sind. In diesem Zusammenhang lassen sich die Ziele dieser Dissertation in zwei wesentliche Teile gliedern. Zunächst wurden geeignete Methoden zur Herstellung von 2-Oxyenamiden ausgehend von leicht zugänglichen Startmaterialien untersucht und etabliert (Teil I). Anschließend wurden, im zweiten Teil dieser Arbeit, 2-Oxyenamide für die stereodivergente Synthese von 1,3-Diamino-2-olen und die stereoselektive Darstellung von Tetrahydrochinolinen verwendet (Teil II)

    Oxyenamides as versatile building blocks for a highly stereoselective one-pot synthesis of the 1,3-diamino-2-ol-scaffold containing three continuous stereocenters

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    A highly diastereoselective one-pot synthesis of the 1,3-diamino-2-alcohol unit bearing three continuous stereocenters is described. This method utilizes 2-oxyenamides as a novel type of building block for the rapid assembly of the 1,3-diamine scaffold containing an additional stereogenic oxygen functionality at the C2 position. A stereoselective preparation of the required (Z)-oxyenamides is reported as well

    Stereoselective Synthesis of 2-Oxyenamides

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    An improved route for the highly stereoselective synthesis of (Z)-2-oxyenamides is reported. The desired products can be accessed in only three steps from aminoacetaldehyde dimethyl acetal as common, readily available building block in a highly modular fashion. The improved procedure has been applied to the synthesis of various acylated and sufonylated oxyenamides. Mechanistic and theoretical studies provide a conclusive rationale for the observed stereoselectivities

    Stereoselective Synthesis of 2-Oxyenamides

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    An improved route for the highly stereoselective synthesis of (Z)-2-oxyenamides is reported. The desired products can be accessed in only three steps from aminoacetaldehyde dimethyl acetal as common, readily available building block in a highly modular fashion. The improved procedure has been applied to the synthesis of various acylated and sufonylated oxyenamides. Mechanistic and theoretical studies provide a conclusive rationale for the observed stereoselectivities

    Streamlined One‐Pot Synthesis of Nitro Fatty Acids

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    A novel method for the synthesis of nitro fatty acids (NFAs), an intriguing class of endogenously occurring lipid mediators, is reported. This one-pot procedure enables the controlled and stereoselective construction of nitro fatty acids from a simple set of common building blocks in a highly facile manner. Thereby, this methodology offers a streamlined, highly modular access to naturally occurring nitro fatty acids as well as non-natural NFA derivatives
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