title: Gold-Catalyzed Oxidative [2+2+1] Annulations of Aryldiazo Nitriles with Imines To Yield Polyarylated Imidazolium Salts.
abstract: Gold-catalyzed oxidative [2+2+1] annulations between two imines and one α-cyano arylgold carbene afforded polyarylated imidazolium salts and molecular hydrogen efficiently. Control experiments suggest that the gold catalyst alone facilitates the main annulation, whereas Ag+avoids the formation of inactive LAuCN. DFT calculations suggest that the success of this annulation relies on a 6 π-electrocyclization of cyano-free intermediates with cis-configured imines as initial reagents.
authors.affiliation: Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan, ROC.
authors.forename: Samir Kundlik
authors.initials: SK
authors.lastname: Pawar
authors.affiliation: Department of Chemistry, National Chia-Yi, University, Chiayi, Taiwan, ROC.
authors.forename: Ming-Chung
authors.initials: MC
authors.lastname: Yang
authors.affiliation: Department of Chemistry, National Chia-Yi, University, Chiayi, Taiwan, ROC.
authors.forename: Ming-Der
authors.initials: MD
authors.lastname: Su
authors.affiliation: Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan, ROC.
authors.forename: Rai-Shung
authors.initials: RS
authors.lastname: Liu
keywords: annulations; arylation; density functional calculations; diazo compounds; gold