The 1,4-addition reaction of lithium derivatives of N,N-disubstituted phenylacetamides with 2-arylmethylene-1,4-butanolides gives the corresponding N,N-disubstituted 2-(1-aryl-2-carbamoyl-2-phenylethyl)-1,4-butanolides 3a–f as diastereoisomeric mixtures with 40–68% yields.
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