Douraki, Saba Mohammadi; Massah, Ahmad Reza, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2015, vol. 54B, # 11, p. 1346 - 1349
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
A simple, clean, and efficient procedure for the green synthesis of some N-alkyl derivatives of sulfonamides is described. Microwave-assisted Michaeladdition 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
KF/Al<sub>2</sub>O<sub>3</sub>as an Efficient, Green, and Reusable Catalytic System for the Solvent-Free Synthesis of<i>N</i>-Alkyl Derivatives of Sulfonamides via Michael Reactions
KF/Al2O3 efficiently catalyzes the microwave-assisted Michael addition of sulfon-amides to alpha, beta-unsaturated esters under solvent-free conditions to afford N-alkyl derivatives of sulfonamides as biologically interesting compounds in high yields and in short reaction times. In this reaction, N,N-dialkylsulfonamides are also produced, but in very low yields.