Tetrahedron p. 513 - 526 (1987)
Update date:2022-07-29
Topics:
Ahmar, Mohammed
Barieux, Jean-Jacques
Cazes, Bernard
Gore, Jacques
The palladium-catalyzed coupling reaction of allenes, vinyl or aryl halides and stabilized carbanions is described: ?-allyl palladium complexes are formed by addition of a vinyl or an aryl-palladium complex to an allenic hydrocarbon and trapped by the sodium enolate of diethyl malonate giving rise with good yields to β-butadienyl or β-styryl malonates.With monoalkyl allenes, the reaction is regiospecific with attack of the nucleophile on the unsubstituted carbon of the intermediate ?-allyl complex and in many cases highly stereoselective with the predominant formation of the E configuration for the trisubstituted double bond of the diene.This configuration was demonstrated by 1H NMR using NOE difference spectroscopy.
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