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Zwei unterschiedliche Katalysatoren … … – ein (+)‐Cinchonidin‐Thioharnstoff‐Derivat (der Schützenfisch, links) und ein L‐Isoleucin‐Triaminoiminophosphoran‐Derivat (der springende Silbergabelbart, rechts) – vermitteln die divergente, diastereo‐ und enantioselektive Michael‐Addition prochiraler Enolate zu Eninyl‐N‐acylpyrazolen (der Zweig). T. Ooi und Mitarbeiter zeigen in ihrer Zuschrift auf S. 4822,...
A site‐divergent stereoselective Michael reaction system is developed based on the identification of two distinct catalysts. Cinchonidine‐derived thiourea catalyzes the 1,4‐addition of prochiral azlactone enolates to enynyl N‐acyl pyrazoles in a highly diastereo‐ and enantioselective manner to give stereochemically defined alkynes, while P‐spiro chiral triaminoiminophosphorane catalytically controls...
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