Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 696, Issue 1, Pages 68-75Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2010.07.034
Keywords
Group 4 metals; Chiral catalysts; Asymmetric catalysis; Hydroamination/cyclization
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Funding
- National Natural Science Foundation of China [20972018, 21074013]
- Scientific Research Foundation of Beijing Normal University [2009SD-13]
- Beijing Municipal Commission of Education
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Group 4 metal complexes based on chiral biaryl ligands are readily prepared by a convenient amine elimination procedure, and they are efficient catalysts for the asymmetric hydroamination/cyclization of aminoalkenes. The biaryl-based ligands are highly modular enabling facile tuning of the catalyst reactivity and selectivity. The corresponding heterocyclic products have been obtained in excellent enantiomeric excesses (up to 93%) using sterically hindered C-2-symmetric titanium and zirconium mesitoylamidate complexes such as [1,1'-(C10H10)(2)-2,2'-{NCO(2,4,6-Me3C6H2)}(2)]M(NMe2)(2) (M = Ti, Zr). These results are presented in this short review. (C) 2010 Elsevier B.V. All rights reserved.
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