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Synfacts 2008(8): 0885-0885  
DOI: 10.1055/s-2008-1077931
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart ˙ New York

Catalyst Recycling via Adsorption on Carbon Nanotubes

Contributor(s): Yasuhiro Uozumi, Noboru Kobayashi
L. Xing, J.-H. Xie, Y.-S. Chen, L.-X. Wang, Q.-L. Zhou*
Nankai University, Tianjin, P. R. of China
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Publication History

Publication Date:
23 July 2008 (online)

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Significance

In this paper, asymmetric hydro­genation of α-dehydroamino acid esters and a new method for recycling chiral catalysts were described. Hydrogenation of 2 was carried out with 1 mol% of a chiral Rh complex of (R,R)-1 to give the corresponding amino acid derivatives 3 in >99% yield with 92-96% ee (4 examples). When the hydrogenation was performed in the presence of carbon nanotubes (CNTs), the catalyst was easily recovered from the reaction mixture by simple filtration.