Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (12): 1371-1378.DOI: 10.11944/j.issn.1000-0518.2015.12.150165

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Potassium Dihydrogen Phosphate Catalyzed Yonemitsu Condensation for Synthesis of 5-[(Indol-3-yl)-arylmethyl]-2,2-dimethyl-1,3-dioxane- 4,6-dione Derivatives

LYU Chengwei(),LIU Yanhang,WANG Jiajing,ZHOU Xiaoxia   

  1. Shcool of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian,Liaoning 116029,China
  • Received:2015-05-11 Accepted:2015-08-20 Published:2015-12-01 Online:2015-12-01
  • Contact: LYU Chengwei
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21403100), the Doctoral Scientific Research Foundation of Liaoning Province(No.20141100)

Abstract:

A simple and efficient procedure for the preparation of 5-[(indol-3-yl)-arylmethyl]-2,2-dimethyl-1,3-dioxane-4,6-dione derivatives has been developed through the Yonemitsu condensation of indole with Meldrum's acid and aldehyde in the mixed solvent of ethanol and water at room temperature using KH2PO4 as an inexpensive, commercially available, and efficient catalyst. The crystal structure of compound 4o was confirmed by X-ray diffraction. This method has the advantages of mild reaction conditions, tolerance to diverse functional groups such as 4-methyl benzaldehyde and 4-methoxy benzaldehyde, and good to excellent yields(48%~98%). Furthermore, some of the products can be facilely obtained by vacuum filtration without further purification. This strategy provides an alternative approach for easy access to useful synthetic β-indole derivatives.

Key words: three-component reaction, Yonemitsu condensation, potassium dihydrogen phosphate, β-indole derivatives, synthesis