Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (5): 890-898.DOI: 10.1016/S1872-2067(17)62826-2

• Articles • Previous Articles     Next Articles

Chiral BINAP-based hierarchical porous polymers as platforms for efficient heterogeneous asymmetric catalysis

Tao Wanga,c, Yuan Lyua, Kai Xiongd, Wenlong Wanga, Hao Zhange, Zhuangping Zhand, Zheng Jiange, Yunjie Dinga,b   

  1. a. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b. State Key Laboratory of catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    c. University of Chinese Academy of Sciences, Beijing 100049, China;
    d. Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
    e. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
  • Received:2017-02-22 Revised:2017-03-23 Online:2017-05-18 Published:2017-05-10
  • Supported by:

    This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB17020400).

Abstract:

Two vinyl-functionalized chiral 2,2’-bis(diphenylphosphino)-1,1’-binaphthyl (BINAP) ligands, (S)-4,4’-divinyl-BINAP and (S)-5,5’-divinyl-BINAP, were successfully synthesized. Chiral BINAP-based porous organic polymers (POPs), denoted as 4-BINAP@POPs and 5-BINAP@POPs, were efficiently prepared via the copolymerization of vinyl-functionalized BINAP with divinyl benzene under solvothermal conditions. Thorough characterization using nuclear magnetic resonance spectroscopy, thermogravimetric analysis, extended X-ray absorption fine structure analysis, and high-angle annular dark-field scanning transmission electron microscopy, we confirmed that chiral BINAP groups were successfully incorporated into the structure of the materials considered to contain hierarchical pores. Ru was introduced as a catalytic species into the POPs using different synthetic routes. Systematic investigation of the resultant chiral Ru/POP catalysts for heterogeneous asymmetric hydrogenation of β-keto esters revealed their excellent chiral inducibility as well as high activity and stability. Our work thereby paves a path towards the use of advanced hierarchical porous polymers as solid chiral platforms for heterogeneous asymmetric catalysis.

Key words: (S)-4,4’-divinyl-BINAP, (S)-5,5’-divinyl-BINAP, Porous organic polymers supported, ruthenium, Heterogeneous asymmetric, hydrogenation, β-keto esters