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Michacl-type addition of diethyl phosphoramidate to α,β-unsaturated esters occurs when the reactants are refluxed in toluene or xylene with an excess of potassium carbonate in the presence of tetrabutyl-ammonium bromide (TBABr). Dephosphorylation of methyl and ethyl acrylate adducts leads to the respective β-alanine esters.
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