One-Pot Synthesis of Spiro Pyrroloimidazoles and 2-Arylimidazoles from 1,2-Diaza-1,3-butadienes and Arylamidines - Attanasi, Orazio A; Giorgi, Gianluca; Favi, Gianfranco; Filippone, Paolino; Lillini, Samuele; Perrulli, Francesca R; Santeusanio, Stefania (Synlett, 2007)