99:1) and high diastereoselectivities (dr up to >20:1). DirectasymmetricvinylogousMichael reactions of γ-aryl-substituted deconjugatedbutenolides with nitroolefins and N-phenylmaleimide are described using bifunctional thiourea derivatives as the catalyst. The resulting butenolide derivatives containing adjacent quaternary and tertiary stereocenters are obtained in good yields (54–90%) and with excellent