Abstract
We examined the activity of a series of L-hydroxyproline derivatives in enantioselective α-amination reaction between diethyl azodicarboxylate and propanal both in organic and aqueous media. In organic media most of the catalysts showed high activity and enantioselectivities comparable to that accessible with L-proline that is among the best catalysts in the reaction. The catalysts showed good activity under aqueous conditions as well; however, only low enantioselectivities were obtained in this case, primarily due to the racemisation of the product under the reaction conditions. Thus, the attempted achiral acid/base additive-driven stereocontrol was not feasible on a practical level.
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Acknowledgments
Financial support from the National Research, Development and Innovation Office, Hungary (OTKA Grants K 109278 and PD 115436), is gratefully acknowledged. Z. Szécsényi (Institute of Pharmaceutical Chemistry, University of Szeged) is acknowledged for technical support. M. S. was supported by a Magyary Zoltán fellowship within the framework of TÁMOP 4.2.4. A/2-11-1-2012-0001 (A2-MZPD-12-0139) and he is currently János Bolyai Research Scholar of the Hungarian Academy of Sciences (BO/00113/15/7). G. L. acknowledges the János Bolyai Research Scholarship from the Hungarian Academy of Sciences. We thank the anonymous reviewers for their insightful comments, which improved the quality of the manuscript.
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Gurka, A.A., Szőri, K., Szőri, M. et al. Application of hydroxyproline derivatives in enantioselective α-amination reactions in organic and aqueous environments: a structure-activity relationship study. Struct Chem 28, 415–421 (2017). https://doi.org/10.1007/s11224-016-0873-z
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DOI: https://doi.org/10.1007/s11224-016-0873-z