Leveraging the Micellar Effect: Gold-Catalyzed Dehydrative Cyclizations in Water at Room Temperature
Stefan R. K. Minkler, Nicholas A. Isley, Daniel J. Lippincott, Norbert Krause* and Bruce H. Lipshutz*
*Dortmund University of Technology, Otto-Hahn-Strasse 6,
D-44227 Dortmund, Germany; University of California, Santa Barbara, California
93106, United States, Email: norbert.krause
tu-dortmund.de,
lipshutzchem.ucsb.edu
S. R. K. Minkler, N. A. Isley, D. J. Lippincott, N. Krause, B. H. Lipshutz, Org. Lett., 2014, 16, 724-726.
DOI: 10.1021/ol403402h
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Abstract
Gold-catalyzed cyclizations of diols and triols to the corresponding hetero- or spirocycles take place in an aqueous medium within nanomicelles, where the hydrophobic effect is operating, thereby driving the dehydrations, notwithstanding the surrounding water. By the addition of simple salts such as sodium chloride, reaction times and catalyst loadings can be significantly decreased.
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Key Words
furans, pyrroles, green chemistry
ID: J54-Y2014
