Enantioselective N<i>-</i>Heterocyclic Carbene Catalyzed Annulation Reactions with Imidazolidinones
作者:Elizabeth O'Bryan McCusker、Karl A. Scheidt
DOI:10.1002/anie.201307292
日期:2013.12.16
Add acetic acid: A highly stereoselective N‐heterocycliccarbene (NHC)‐catalyzed formal [4+2] annulation between α,β‐unsaturated aldehydes and imidazolidinones for the synthesis of imidazoles has been developed. Acetic acid serves as a key additive to achieve high chemoselectivity for the formal [4+2] annulation product.