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Highly Enantioselective α-aminoxylation Reactions Catalyzed by Isosteviol-proline Conjugates in Buffered Aqueous Media

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Abstract

Chiral amphiphilic conjugate catalysts were designed and synthesized by covalently connecting l-proline with an inexpensive natural product, isosteviol. These catalysts demonstrated remarkable efficiency in the asymmetric α-aminoxylation of aldehydes and ketones using nitrosobenzene in phosphate buffer solution, resulting in good to high yields and excellent enantioselectivities without using any additives. At pH 9.1, the amphiphilic catalysts showed a pH responsive ability in phosphate buffer solution, which facilitated the excellent O-selectivity reactions, illustrating a viable approach for the development of asymmetric supra-molecular catalysts.

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Acknowledgment

The authors are thankful to the financial support of the Natural Science Foundation of China (NSFC 20772113).

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Correspondence to Jing-Chao Tao.

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An, YJ., Wang, CC., Xu, YZ. et al. Highly Enantioselective α-aminoxylation Reactions Catalyzed by Isosteviol-proline Conjugates in Buffered Aqueous Media. Catal Lett 141, 1123–1129 (2011). https://doi.org/10.1007/s10562-011-0574-6

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  • DOI: https://doi.org/10.1007/s10562-011-0574-6

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