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Chemische Berichte
Article . 2011 . Peer-reviewed
License: Wiley Online Library User Agreement
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Synthesis, Coordination Properties and Application of New N,N‐Ligands Based on Bornyl and Binaphthylazepine Chiral Backbones in Palladium‐Catalyzed Allylic Substitution Reactions

Authors: BOTTARI, GIOVANNI; Meduri A.; DROMMI, Dario; BRANCATELLI, GIOVANNA; FARAONE, Felice;

Synthesis, Coordination Properties and Application of New N,N‐Ligands Based on Bornyl and Binaphthylazepine Chiral Backbones in Palladium‐Catalyzed Allylic Substitution Reactions

Abstract

AbstractThe synthesis of new imine‐amine and diamine ligands, based on both the atropisomeric (Sa)‐ or (Ra)‐1,1′‐binaphthyl and (R)‐bornyl backbones, and incorporating an ethylenediamino spacer, are reported. In addition, analogue ligands in which one chiral arm is replaced by the achiral NMe2 group were synthesized. These N,N‐ligands when coordinated to a palladium metal centre form highly enantioselective catalysts for the asymmetric allylic alkylation of rac‐2‐acetoxy‐1,3‐diphenylpropene by dimethyl malonate. In one case, the synergic effect of the chirality elements in the palladium catalyst afforded the (S) substitution product with an enantiomeric excess (ee) of >99 %. Based on NMR studies of the active species in solution, a reliable explanation for the origin of the enantioselectivity of these palladium catalysts is also provided.

Country
Italy
Keywords

Palladium, N ligands, Allylic compounds, Asymmetric catalysis, Enantioselectivity

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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