Journal
DALTON TRANSACTIONS
Volume 42, Issue 2, Pages 507-520Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2dt31265d
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Funding
- CNRS
- MENSR
- ANR [07 367]
- GDRI (Homogeneous Catalysis for Sustainable Development)
- French Embassy at Moscow
- Russian Foundation for Basic Research [08-03-92501]
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Chiral alkyl or amido yttrium complexes were prepared from N-silyl- or N-cyclopentyl-substituted binaphthylamido ligands. According to the synthetic procedure, these complexes could be obtained in their neutral form or as heterobimetallic complexes in the presence of 1 equiv. LiCl. These new species were characterized by IR and NMR spectroscopies, elemental analyses and some of them by X-ray diffraction studies. Their efficiency as catalysts for the asymmetric intramolecular hydroamination was then evaluated with several substrates towards the synthesis of two pyrrolidines and a piperidine derivative. A cooperative effect between the lithium and the yttrium atoms was undoubtedly revealed. LiCl-containing complexes afforded indeed higher enantioselectivities than their salt-free counterparts and according to the structure of the chiral ligand, they were also the most active species.
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