Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (8): 1312-1317.DOI: 10.1016/S1872-2067(11)60421-X

• Research papers • Previous Articles     Next Articles

Synthesis of 2-Amino-4,6-diarylnicotinonitriles Using Silica-Bound N-Propyl Triethylenetetramine Sulfamic Acid as a Recyclable Solid Acid Catalyst

Khodabakhsh NIKNAM*, Abbas JAMALI, Marzieh TAJADDOD, Abdollah DERIS   

  1. Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran
  • Received:2012-03-06 Revised:2012-05-03 Online:2012-08-01 Published:2012-08-01

Abstract: A simple and efficient procedure for the preparation of silica-bound N-propyl triethylenetetramine sulfamic acid (SBPTETSA) by the reaction of silica-bound N-propyl triethylenetetramine (SBPTET) with chlorosulfonic acid in chloroform is described. Silica-bound N-propyl triethylenetetramine sulfamic acid was employed as a recyclable catalyst for the synthesis of 2-amino-4,6-diarylnicotinonitriles from the multi-component reaction of an acetophenone derivative, an aromatic aldehyde, malononitrile, and ammonium acetate under solvent-free conditions at 100 °C. The heterogeneous catalyst was recycled for five consecutive runs in the optimized multi-component reaction of 4-chloroacetophenone, 4-chloroenzaldehyde, malononitrile, and ammonium acetate without significant loses to its catalytic activity.

Key words: silica-bonded N-propyl triethylenetetramine sulfamic acid, 2-amino-4,6-diarylnicotinonitrile, pyridine, aldehyde, solvent-free