Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (5): 784-792.DOI: 10.1016/S1872-2067(17)62804-3

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Enantioselective synthesis of quaternary α-aminophosphonates by organocatalytic Friedel–Crafts reactions of indoles with cyclic α-ketiminophosphonates

Zhong Yan, Xiang Gao, Yong-Gui Zhou   

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2017-01-20 Revised:2017-02-28 Online:2017-05-18 Published:2017-05-10
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21532006, 21690074).

Abstract:

An efficient asymmetric Friedel–Crafts reaction has been developed for the synthesis of optically active quaternary α-aminophosphonates with up to 98% ee. The synthesis involves the reaction of cyclic α-ketiminophosphonates with indoles using an H8-BINOL-derived chiral phosphoric acid (CPA) catalyst that bears electron-withdrawing 3,5-ditrifluoromethylphenyl substituents on its 3- and 3'-positions. This Friedel–Crafts reaction of cyclic α-ketiminophosphonates was also successful with pyrrole.

Key words: Friedel–Crafts reaction, Quaternary α-aminophosphonate, Indole, Chiral phosphoric acid