<i>N</i>-Heterocyclic Carbene-Catalyzed Generation of Homoenolates: γ-Butyrolactones by Direct Annulations of Enals and Aldehydes
作者:Stephanie S. Sohn、Evelyn L. Rosen、Jeffrey W. Bode
DOI:10.1021/ja044714b
日期:2004.11.1
generation of reactive homoenolates from alpha,beta-unsaturated aldehydes. The catalyst-bound homoenolate reacts with electrophilic aldehydes leading, via the key intermediacy of an activated carboxylate, to gamma-butyrolactones in good yields and stereoselectivities. Importantly, this process demonstrates an unprecedented reaction mode for the generation of nucleophilic carbanions with a multifunctional
由二芳基咪唑鎓盐原位制备的 N-杂环卡宾用作高效催化剂,用于从 α,β-不饱和醛生成反应性均烯醇化物。与催化剂结合的均烯醇化物与亲电子醛反应,通过活化羧酸盐的关键中间体,以良好的产率和立体选择性生成 γ-丁内酯。重要的是,该过程展示了一种前所未有的反应模式,用于在非常温和和方便的反应条件下使用多功能有机催化剂生成亲核碳负离子。