Synthesis of Some 2,5-Disubstituted 5-Aryl-4-oxo-4,5-dihydropyrrole Derivatives from 2,5-Disubstituted 3-Ethoxycarbonyl-5-hydroxy-4-oxo-4,5-dihydropyrroles - Gelin, Suzanne; Deshayes, Christian (Synthesis, 1982)