Sulfonated chitosan-encapsulated HAp@Fe3O4: an efficient and recyclable magnetic nanocatalyst for rapid eco-friendly synthesis of 2-amino-4-substituted-1,4-dihydrobenzo[4, 5]imidazo[1,2-a]pyrimidine-3-carbonitriles
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A one-pot, multi-component, synthetic method for preparation of 2-amino-4-substituted-1,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrimidine-3-carbonitriles has been developed. It was accomplished by mixing 2-aminobenzimidazole, aldehyde and malononitrile in the presence of S-Chit-HAp@Fe3O4 as a nanocatalyst in aqueous medium. The catalyst (S-Chit-HAp@Fe3O4) was synthesized using a co-precipitation method and further characterized by using FT-IR, XRD, FE-SEM, EDX, HR-TEM, TGA and VSM analysis. It was found that the catalyst exhibits magnetic properties and showed high catalytical activity for the synthesis of 2-amino-4-substituted-1,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrimidine-3-carbonitriles.
KeywordsGreen chemistry S-Chit-HAp@Fe3O4 Chitosan Hydroxyapatite Fe3O4 nanoparticles 2-Aminobenzimidazole Malononitrile
The authors are thankful to UGC, New Delhi, for financial assistance under a one-time grant [F. no. 19-110/2013 (BSR)] and major research project [F. no. 41-302/2012 (SR)]. the authors are also thankful to SAIF, IIT Bombay, IIT Madras and Panjab University, Chandigarh, for providing instrument facilities. Author VNM is very much grateful to the UGC, New Delhi, for awarding the Rajiv Gandhi National Fellowship.
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