A New Method for the Synthesis of Functionalized 5-Hydroxy-1,5-dihydro-2H-pyrrol-2-one: Reaction of an Enamine, Derived from Addition of a Secondary Amine to Dibenzoylacetylene, with an Arylsulfonyl Isocyanate - Alizadeh, Abdolali; Movahedi, Farnaz; Masrouri, Hassan; Zhu, Long-Guan (Synthesis, 2006)