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Zwei katalytische Prozesse …… , nämlich Palladium‐Katalyse und Brønsted‐Säure‐Katalyse, liefern unterschiedliche Produkte bei der Addition von Alkoxyallenen an Pyrazolone. Wie G. Jiang et al. in ihrer Zuschrift auf S. 1097 zeigen, führt Pd‐Katalyse zu verzweigten allylischen Pyrazol‐5‐onen unter extrem milden Bedingungen, während eine chirale Brønsted‐Säure lineare Additionsprodukte ergibt.
A highly enantioselective regiodivergent addition of alkoxyallenes to pyrazolones was developed to afford multiply functionalized alkylated products bearing a quaternary carbon stereocenter in high yields with excellent stereoselectivities. One approach is enabled by palladium catalysis, thus leading to branched allylic pyrazol‐5‐ones under mild reaction conditions. The other is catalyzed by a chiral...
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