Rational design of cyclopropane-based chiral PHOX ligands for intermolecular asymmetric Heck reaction

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Issue Date
2014-07-07Author
Rubina, Marina
Sherrill, William M.
Barkov, Alexey Yu
Rubin, Michael
Publisher
Beilstein-Institut
Type
Article
Article Version
Scholarly/refereed, publisher version
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Show full item recordAbstract
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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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
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