Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (12): 2200-2208.DOI: 10.1016/S1872-2067(12)60684-6

• Research papers • Previous Articles     Next Articles

Rice husk ash supported FeCl2·2H2O:A mild and highly efficient heterogeneous catalyst for the synthesis of polysubstituted quinolines by Friedländer heteroannulation

Farhad Shirini, Somayeh Akbari-Dadamahaleh, Ali Mohammad-Khah   

  1. Department of Chemistry, College of Sciences, University of Guilan, Rasht 41335, Iran
  • Received:2013-07-15 Revised:2013-08-16 Online:2013-11-25 Published:2013-11-25
  • Contact: Farhad Shirini

Abstract:

Rice husk ash was used as a new, green, and cheap adsorbent for FeCl3. Characterization of the obtained reagent showed that rice husk ash supported FeCl2·2H2O was formed. This reagent is efficient at catalyzing the synthesis of multisubstituted quinolines by the Friedländer heteroannulation of o-aminoaryl ketones with ketones or β-diketones under mild reaction conditions. This methodology allows for the synthesis of a broad range of substituted quinolines in high yields and with excellent regioselectivity in the absence of a solvent.

Key words: Rice husk ash, Supported FeCl2·2H2O, Quinolines, 2-Amino benzophenone, Solvent-free, Friedländer heteoannulation