Treatments of 1-(2,6-dichlorobenzoyl)-, 3-acetyl-1-(2,6-dichlorobenzoyl)-, 1-(2,6-dichlorobenzoyl)-2-formyl-, and 1-(phenylsulfonyl)pyrroles with palladium acetate and alkyl acrylates gave the corresponding α-alkenyl-substituted pyrroles in good yields, while the reaction of 1-(2,6-dichlorobenzoyl)-2,5-dimethylpyrrole gave small amounts of β-alkenyl-substituted pyrroles. Under similar conditions, 1-(2,6-dichlorobenzoyl)pyrazole and 1-(2,6-dichlorobenzoyl)-3,5-dimethylpyrazole reacted with palladium acetate and alkyl acrylates to give the corresponding 4-alkenyl-substituted pyrazoles. The reaction of 1-(2,6-dichlorobenzoyl)-4-methylpyrazole gave 5-alkenyl-substituted pyrazole
Die Pyrrole (Ia)‐(Id) (Umsatz zwischen 34% und 97% ‐ Tab.) sowie die Pyrazole (IVa) und (IVb) (Umsatz 14‐29%) reagieren mit den Estern (III) unter der angegebenen Reaktionsbedingung unter Bildung der aufgeführten Alkenylderivate.
N‐Methyl‐2‐pyridon (I), 2‐Formylfuran (IVa) und 2‐Formylthiophen (IVb) werden mit Acrylsäureestern (II) und Palladiumacetat in 5‐Stellung zu entsprechenden Acrylsäure‐Derivaten alkenyliert.
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