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A stereoselective one‐pot synthesis of spiropyrazolones through an organocatalytic asymmetric Michael addition and a formal Conia‐ene reaction has been developed. Depending on the nitroalkene, the 5‐exo‐dig‐cyclization could be achieved by silver‐catalyzed alkyne activation or by oxidation of the intermediate enolate. The mechanistic pathways have been investigated using computational chemistry and...
Nimm zwei: Durch Verwendung zweier Äquivalente eines Aldehyds kann bei einer asymmetrischen, organokatalytischen Dominoreaktion aus dem nucleophilen Enamin‐Intermediat durch Oxidation mit o‐Iodoxybenzoesäure auch die elektrophile Iminiumspezies gebildet werden. Somit werden aus nur zwei einfachen Startmaterialien komplexe Cyclohexenderivate in guten Ausbeuten und Stereoselektivitäten zugänglich (siehe...
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