期刊
TETRAHEDRON
卷 67, 期 45, 页码 8790-8799出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2011.08.072
关键词
Heterobimetallic complexes; Catalysis; Addition; Guanidines
资金
- National Natural Science Foundation of China [20972107, 20872106]
- Specialized Research Fund for the Doctoral Program of Higher Education [200802850003]
A series of heterobimetallic dianionic guanidinate complexes of lanthanide and lithium, [Li(TH-F)(DME)](3)Ln[mu-eta(2)eta(1)((PrN)-Pr-i)(2)C(NC(6)H(4)p-R)](3) (R=Cl, Ln=Nd (I), Y (II), La (III); R=H, Ln=Nd (IV)] were synthesized and fully characterized. These complexes were found to be highly efficient precatalysts for the addition of various primary and secondary amines, and aromatic and aliphatic diamines to carbodiimides to give the corresponding monoguanidine and biguanidine derivatives under mild condition (at 25-60 degrees C), which provides an efficient way for the synthesis of biguanidines compounds. The activity depends on the central metals and ligands: La>Nd>Y for the metals and [((PrN)-Pr-i)(2)C(NC6H4P-Cl)](2-)> [((PrN)-Pr-i)(2)C(NC6H5)](2-) for the ligands were observed. (C) 2011 Elsevier Ltd. All rights reserved.
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