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‐heterocyclic carbene (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.
添加乙酸:已开发出一种高度立体选择性的 N-杂环卡宾 (NHC) 催化的 α,β-不饱和醛和咪唑烷酮之间的 [4+2] 环化,用于合成咪唑。乙酸作为一种关键添加剂,可实现正式 [4+2] 环化产物的高化学选择性。