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Enantioselective Friedel–Crafts Reactions of Aromatic Amines with Ethyl Glyoxylate in Pyridinium-Based Ionic Liquids
Sanjay V.
Malhotra A B,
Ying
Xiao A
A
Department of Chemistry and Environmental Science, New Jersey Institute of Technology, University Heights, Newark, NJ 07102, USA.
B
Corresponding author. Email: malhotra@njit.edu
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Australian Journal of Chemistry 59(7) 468–472 http://dx.doi.org/10.1071/CH06221
Submitted: 21 June 2006
Accepted: 28 July 2006
Published online: 22 August 2006
Abstract
The Friedel–Crafts reactions of aromatic amines with ethyl glyoxylate in pyridinium-based ionic liquids (ILs) are investigated using 2,2′-dihydroxy-1,1′-binaphthyl (BINOL) metal complexes as chiral catalysts. Reaction parameters such as the catalyst–IL compositions, reactant compositions, reaction time, and reaction temperature are studied. High yields and excellent enantioselectivities are achieved under the relatively mild conditions. The ILs can also be recycled and reused as opposed to traditional solvent systems.
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