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Design of P-Chirogenic Aminophosphine-Phosphinite (AMPP*) Ligands at both Phosphorus Centers: Origin of Enantioselectivities in Pd-Catalyzed Allylic Reactions

Abstract : We have recently patented an unprecedented stereospecific N→O phosphinyl migration process which transforms P-chirogenic aminophosphines into phosphinites. A fine design of aminophosphine phosphinite ligands (AMPP*) derived from ephedrine and bearing a P-chirogenic center either at the aminophosphine or phosphinite moiety, was performed. The synthesis of AMPP* ligands with P-chirogenic aminophosphine moiety was based on the well-established stereospecific reaction of oxazaphospholidine-borane with organolithium reagents, followed by trapping with a chlorophosphine and borane decomplexation. Concurrently, the preparation of AMPP* ligands with P-chirogenic phosphinite moiety were performed by N→O phosphinyl migration of aminophosphines borane by heating at 50 °C with DABCO, and then reaction with chlorophosphines. AMPP* ligands were studied in palladium-catalyzed asymmetric allylic alkylations, leading to enantioselectivities from 91% (R) to 95% e.e. (S). X-ray crystallographic data for relevant Pd-AMPP* complexes and computer modeling explained the origin of the enantioselectivities based on MO interactions of most stable conformers with nucleophiles.
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Submitted on : Thursday, May 28, 2020 - 5:01:22 PM
Last modification on : Tuesday, September 1, 2020 - 3:09:39 AM

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Antonin Jaillet, Christophe Darcel, Jérôme Bayardon, Adrien Schlachter, Christine Salomon, et al.. Design of P-Chirogenic Aminophosphine-Phosphinite (AMPP*) Ligands at both Phosphorus Centers: Origin of Enantioselectivities in Pd-Catalyzed Allylic Reactions. Journal of Organic Chemistry, American Chemical Society, 2020, ⟨10.1021/acs.joc.0c00536⟩. ⟨hal-02635117⟩

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