Abstract
Chiral urea-quaternary ammonium salt hybrid organocatalysts were tested for their capability to control asymmetric α-chlorination reactions of β-ketoesters. After a careful screening we identified a structurally simple catalyst derivative that allowed us to obtain enantiomeric ratios up to 90:10 under operationally simple conditions using just 1 mol% of the catalyst.
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Acknowledgments
The used NMR spectrometers at JKU Linz were acquired in collaboration with the University of South Bohemia (CZ) with financial support from the European Union through the EFRE INTERREG IV ETC-AT-CZ program (project M00146, “RERI-uasb”). Financial support by the Federal State Government of Upper Austria (Research Fellowship to J. N.) is kindly acknowledged.
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Novacek, J., Monkowius, U., Himmelsbach, M. et al. Asymmetric α-chlorination of β-ketoesters using bifunctional ammonium salt catalysis. Monatsh Chem 147, 533–538 (2016). https://doi.org/10.1007/s00706-015-1604-7
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DOI: https://doi.org/10.1007/s00706-015-1604-7