期刊
TETRAHEDRON LETTERS
卷 49, 期 18, 页码 2878-2881出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2008.03.039
关键词
chiral phosphorous ligands; pseudorotaxane; self-assembly; asymmetric hydrogenation
A new type of supramolecular chiral phosphorus-based ligands was prepared from easily available monodentate ligands through complexation between dibenzylammonium salt and dibenzo[24]crown-8 macrocycle. Rhodium complexes with these supramolecular ligands were prepared, and the supramolecular bidentate ligand-containing catalyst has demonstrated better catalytic activity for all substrates, and higher enantioselectivity except for the ortho-substituted substrates than those obtained from the parent monodentate ligand in the asymmetric hydrogenation of alpha-dehydroamino acid esters. (c) 2008 Elsevier Ltd. All rights reserved.
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