Abstract
The present chapter introduces the basic fundaments of the palladium-catalyzed allylic substitution reaction. After a brief introduction, the reaction is explored into the different steps of the catalytic cycle in a chronological order. Formation of the crucial η 3-allyl palladium complexes is first commented, followed by a brief description of the static isomerism and dynamic features related to these compounds. Synthetic opportunities to intercept these complexes are then presented. Selectivity is then addressed with a first focus on regioselectivity and memory effects. Finally, selected examples of enantioselective versions are presented and classified according to the position of the enantiodiscriminating step in the catalytic cycle.
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Notes
- 1.
Throughout this chapter, brackets around palladium atom in the notation of a generic (charged or neutral) allyl complex intend to render implicit the dative ligands. An asterisk next to the brackets indicates the presence of a chiral (usually enantiopure) ligand.
- 2.
As we will see later, this π-allyl palladium(II) complex can be also generated via interaction between an alkene and a PdX2 complex.
- 3.
Metal-catalyzed allylic alkylation to afford branched products can be obtained using transition metals other than palladium. However, this topic is beyond the scope of the present chapter.
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Acknowledgments
The authors warmly thank Professors Francesco Sannicolò and Guy Lloyd-Jones for stimulating discussions.
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Poli, G., Prestat, G., Liron, F., Kammerer-Pentier, C. (2011). Selectivity in Palladium-Catalyzed Allylic Substitution. In: Kazmaier, U. (eds) Transition Metal Catalyzed Enantioselective Allylic Substitution in Organic Synthesis. Topics in Organometallic Chemistry, vol 38. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3418_2011_14
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