Nickel-Catalysed Bis-Allylation of Activated Nucleophiles with Allyl Alcohol
Résumé
Nickel-based catalysis allows the efficient bis-allylation of soft nucleophiles with allylic alcohols. The reaction is best promoted by a combination of Ni(cod)2 (cod = cyclooctadienyl) and diphenylphosphinobutane under additive-free conditions. Alternatively, nickel(II) precursors can be used provided that a reductant is used to generate the nickel(0) species. The NiCl2/Zn combination is particularly simple, and can advantageously replace the use of the more air-sensitive Ni(cod)2 precursor. The scope of the reaction was studied with nucleophiles and allylic derivatives suitable for bis-allylation reactions.