Gold-Catalyzed Synthesis of 2-Substituted, 2,3-Disubstituted and 1,2,3-Trisubstituted Indoles in [bmim]BF4 - Ambrogio, Ilaria; Arcadi, Antonio; Cacchi, Sandro; Fabrizi, Giancarlo; Marinelli, Fabio (Synlett, 2007)