Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (1): 57-67.DOI: 10.1016/S1872-2067(14)60199-6

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Diastereo- and enantioselective conjugate addition of α-keto esters to nitroalkenes: Complete switch in the enantioselectivity by tuning the metal center or rigidity of the ligand

Xiangning Chen, Han Zhou, Hanmin Huang   

  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
  • Received:2014-05-15 Revised:2014-06-15 Online:2014-12-31 Published:2014-12-31
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21222203, 21172226, and 21133011).

Abstract:

A series of efficient catalytic systems has been developed to control the dual enantioselectivity of the conjugate addition of α-keto esters to nitroalkenes. The use of the chiral diamine (1S,1'S)-1,1'-biisoindoline as a chiral ligand with either (Cu(OAc)2·H2O or Ni(OAc)2·4H2O as the catalyst provide facile access to the respective enantiomers resulting from the conjugate addition reaction with high levels of enantioselectivity (94% ee vs 93% ee). Furthermore, the use of Cu(OAc)2·H2O as the metal center allowed the enantioselectivity of the conjugate addition reaction to be switched through the tuning of the rigidity of the chiral diamine ligand (94% ee vs 94% ee).

Key words: Chiral diamine, Conjugate addition, Dual enantioselectivity, Metal center, Rigid ligand