Abstract
Acidic ionic liquid N -methyl-2-pyrrolidonium dihydrogen phosphate [NMP]H 2 PO 4 was prepared and used as efficient catalyst and reaction medium to synthesize β-alkoxyketones by the oxa-Michael addition reactions for the first time. The effect of anions and cations, amount of ionic liquid on the reaction was investigated. Various alcohols and phenols proceeded smoothly and led to corresponding β-alkoxyketones with high yields under mild reaction conditions, O-selectivity addition of aminoethanols was also achieved in this paper. Compared with traditional imidazolium ionic liquids, [NMP]H 2 PO 4 gave the better results. The ionic liquid was stable and could be reused at least five times with a slight loss of activity.
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