Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (9): 1463-1469.DOI: 10.1016/S1872-2067(18)63116-X

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Enantioselective epoxidation of olefins with hydrogen peroxide catalyzed by bioinspired aminopyridine manganese complexes derived from L-proline

Wenfang Wanga,b, Qiangsheng Suna, Chungu Xiaa, Wei Suna   

  1. a State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-03-26 Revised:2018-05-22 Online:2018-09-18 Published:2018-07-19
  • Contact: 10.1016/S1872-2067(18)63116-X
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21473226, 21773273), Key Research Program of Frontier Sciences, CAS (QYZDJ-SSW-SLH051), and Natural Science Foundation of Jiangsu Province (BK20170420).

Abstract:

Three chiral aminopyridine ligands derived from L-proline were prepared. Careful evaluation of the corresponding aminopyridine manganese complexes in asymmetric epoxidation of olefins revealed a broad substrate scope in the presence of 0.2 mol% manganese complex and 0.5 equiv. 2,2-dimethylbutyric acid, with aqueous hydrogen peroxide as an oxidant. A variety of olefins including styrenes, chromenes, and cinnamamides were transformed successfully into the target epoxides with moderate to excellent enantioselectivity (yield up to 95%, ee up to 99%).

Key words: Aminopyridine ligand, Manganese, Asymmetric epoxidation, Hydrogen peroxide, Olefin