| Autor: |
Chapurina Y; Equipe de Catalyse Moléculaire, Univ Paris-Sud, ICMMO, UMR 8182, Orsay, F-91405, France., Guillot R, Lyubov D, Trifonov A, Hannedouche J, Schulz E |
| Jazyk: |
angličtina |
| Zdroj: |
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2013 Jan 14; Vol. 42 (2), pp. 507-20. Date of Electronic Publication: 2012 Oct 19. |
| DOI: |
10.1039/c2dt31265d |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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