Ferrosalen and Ferrosalen-Type Ligands: Structural Modulation and Applications in Asymmetric Catalysis
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- 作者：Xiang Zhang ; Rudy L. Luck ; Shiyue Fang
- 刊名：Organometallics
- 出版年：2011
- 出版时间：May 9, 2011
- 年：2011
- 卷：30
- 期：9
- 页码：2609-2616
- 全文大小：940K
- 年卷期：v.30,no.9(May 9, 2011)
- ISSN：1520-6041
文摘
Several ferrosalen and ferrosalen-type ligands, 1鈭?b>10, were prepared and fully characterized. The structure of one of these ligands ligated to Cu(II) was determined by single-crystal X-ray diffraction analysis. In comparison with the parent ligand 1, the two six-membered rings of ligand 2 are not aromatized and the synthesis was more facile. Diastereoisomers 3 and 4, containing substituents on the ethylene chain, were synthesized. The aromatized versions of 3 and 4, namely 5 and 6, were also prepared. Further modulation of the ethylene backbone produced ligands 7 and 8. Replacing the Cp ligands with Cp* and CpPh5 gave ligands 9 and 10, respectively. All these ligands were tested for catalytic asymmetric reactions, including the Co(III)-catalyzed carbonyl-ene reaction, Al(III)-catalyzed Strecker reaction, and Al(III)-catalyzed silylcyanation of aldehyde.