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Supramolecular chiral phosphorous ligands based on a [2]pseudorotaxane complex for asymmetric hydrogenation

✍ Scribed by Yong Li; Yu Feng; Yan-Mei He; Fei Chen; Jie Pan; Qing-Hua Fan

Publisher: Elsevier Science
Year: 2008
Tongue: French
Weight: 123 KB
Volume: 49
Category: Article
ISSN: 0040-4039
DOI: 10.1016/j.tetlet.2008.03.039

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✦ Synopsis

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 a-dehydroamino acid esters.

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