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Keywords
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Michael addition, sulfonamide, α,β-unsaturated ester, ionic liquid, MgO, microwave
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Abstract
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The microwave-assisted Michael addition reaction of sulfonamides 1 to α,β-unsaturated esters 2 was carried out in the presence of a catalytic amount of magnesium oxide (MgO) and with the ionic liquid 1-butyl-3-methylimidazolium bromide ([bmim]Br) as a recyclable solvent affording N-alkyl sulfonamides 3 as well as N,N-dialkyl sulfonamides 4 in short reaction times.
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