Nano-NiFe2O4 catalyzed microwave assisted one-pot regioselective synthesis of novel 2-alkoxyimidazo[1,2-a]pyridines under aerobic conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (15) ◽  
pp. 12402-12407 ◽  
Author(s):  
Soumen Payra ◽  
Arijit Saha ◽  
Subhash Banerjee
Keyword(s):  
Michael Addition ◽  
Regioselective Synthesis ◽  
Reusable Catalyst ◽  
One Pot ◽  
Aerobic Conditions ◽  
Microwave Assisted ◽  
Ligand Transfer

Here, we have demonstrated regioselective synthesis of novel 2-alkoxy-3-arylimidazo[1,2-a]pyridines using nano-NiFe2O4 as reusable catalyst via one-pot sequential aza-Michael addition, Fe-promoted ligand transfer and C–H imination reactions.

Zinc oxide-tetrabutylammonium bromide tandem as a highly efficient, green, and reusable catalyst for the Michael addition of pyrimidine and purine nucleobases to α,β-unsaturated esters under solvent-free conditions

2008 ◽  
Vol 86 (4) ◽  
pp. 317-324 ◽  
Author(s):  
Abdolkarim Zare ◽  
Alireza Hasaninejad ◽  
Mohammad Hassan Beyzavi ◽  
Abolfath Parhami ◽  
Ahmad Reza Moosavi Zare ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Michael Addition ◽  
Tetrabutylammonium Bromide ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Efficient Procedure ◽  
Unsaturated Esters ◽  
Microwave Assisted ◽  
Solvent Free Conditions ◽  
The Michael Addition

An efficient procedure for the synthesis of carboacyclic nucleosides via microwave-assisted Michael addition of pyrimidine and purine nucleobases to α,β-unsaturated esters in the presence of catalytic amounts of zinc oxide (ZnO) and tetrabutylammonium bromide (TBAB) is described. The reactions proceed rapidly in good to excellent yields.Key words: ZnO–TBAB, green chemistry, Michael addition, nucleobase, solvent-free, microwave.

Zinc oxide as a new, highly efficient, green, and reusable catalyst for microwave-assisted Michael addition of sulfonamides to α,β-unsaturated esters in ionic liquids

2007 ◽  
Vol 85 (6) ◽  
pp. 438-444 ◽  
Author(s):  
Abdolkarim Zare ◽  
Alireza Hasaninejad ◽  
Ahmad Reza Moosavi Zare ◽  
Abolfath Parhami ◽  
Hashem Sharghi ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Michael Addition ◽  
Catalytic Amount ◽  
Reusable Catalyst ◽  
Efficient Procedure ◽  
Unsaturated Esters ◽  
Microwave Assisted ◽  
Alkyl Derivatives ◽  
High Yields ◽  
Derivatives Of

A simple, clean, and efficient procedure for the green synthesis of some N-alkyl derivatives of sulfonamides is described. Microwave-assisted Michael addition of sulfonamides to α,β-unsaturated esters, in the presence of catalytic amount of zinc oxide (ZnO) in 1-butyl-3-methylimidazolium bromide ([bmim]Br), affords the title compounds in high yields and short reaction times.Key words: zinc oxide, green chemistry, microwave, Michael addition, sulfonamide, ionic liquid.

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