Synthesis, characterisation and application of lanthanide cyclen complexes in organic synthesis
作者:Andrei S. Batsanov、James I. Bruce、Thota Ganesh、Paul J. Low、Ritu Kataky、Horst Puschmann、Patrick G. Steel
DOI:10.1039/b111628b
日期:2002.3.25
Hexadentate cyclen complexes of Sm(III), Eu(III) and Yb(III) have been prepared from 1,4-bis[(R)-α-methylbenzylaminocarbonylmethyl]-1,4,7,10-tetraazacycldodecane and characterised. The crystal structures of the isomorphous complexes of Eu(III) and Sm (III) have been determined. These may be electrochemically reduced to the +II oxidation state and employed in organic synthesis. However, no asymmetric induction was observed and this can be attributed to the fluxional nature of these complexes in solution and the limited asymmetric influence imparted by the N-(α-methylbenzyl)acetamide chiral auxiliary.
由 1,4-双[(R)-α-甲基苄氨基羰基甲基]-1,4,7,10-四氮杂环十二烷制备了 Sm(III)、Eu(III)和 Yb(III)的六价环烯配合物,并对其进行了表征。Eu(III) 和 Sm(III) 的同构络合物的晶体结构已经确定。这些复合物可通过电化学还原到 +II 氧化态,并用于有机合成。不过,没有观察到不对称诱导,这可能是由于这些配合物在溶液中的通性以及 N-(α-甲基苄基)乙酰胺手性助剂的有限不对称影响。