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Rational design of cyclopropane-based chiral PHOX ligands for intermolecular asymmetric Heck reaction
Rubina, Marina Sherrill, William M. Barkov, Alexey Yu Rubin, Michael
Rubina, Marina
Sherrill, William M.
Barkov, Alexey Yu
Rubin, Michael
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Abstract
A novel class of chiral phosphanyl-oxazoline (PHOX) ligands with a conformationally rigid cyclopropyl backbone was synthesized and tested in the intermolecular asymmetric Heck reaction. Mechanistic modelling and crystallographic studies were used to predict the optimal ligand structure and helped to design a very efficient and highly selective catalytic system. Employment of the optimized ligands in the asymmetric arylation of cyclic olefins allowed for achieving high enantioselectivities and significantly suppressing product isomerization. Factors affecting the selectivity and the rate of the isomerization were identified. It was shown that the nature of this isomerization is different from that demonstrated previously using chiral diphosphine ligands.
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Date
2014-07-07
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Beilstein-Institut
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Keywords
Asymmetric Catalysis, Chiral Phosphine Ligands, Cyclopropane, Heck Reaction, Organophosphorus, Transition Metal Catalysis
Citation
Marina Rubina, William M Sherrill, Alexey Yu Barkov, Michael Rubin "Rational design of cyclopropane-based chiral PHOX ligands for intermolecular asymmetric Heck reaction" Beilstein J Org Chem. 2014; 10: 1536–1548. Published online 2014 July 7. http://dx.doi.org/10.3762/bjoc.10.158