Asymmetric N-Heterocyclic Carbene Catalyzed Addition of Enals to Nitroalkenes: Controlling Stereochemistry via the Homoenolate Reactivity Pathway To Access δ-Lactams
作者:Nicholas A. White、Daniel A. DiRocco、Tomislav Rovis
DOI:10.1021/ja403847e
日期:2013.6.12
An asymmetric intermolecular reaction between enals and nitroalkenes to yield δ-nitroesters has been developed, catalyzed by a novel chiral N-heterocyclic carbene. Key to this work was the development of a catalyst that favors the δ-nitroester pathway over the established Stetter pathway. The reaction proceeds in high stereoselectivity and affords the previously unreported syn diastereomer. We also
在新型手性 N-杂环卡宾的催化下,烯醛和硝基烯烃之间的不对称分子间反应已被开发,以产生 δ-硝基酯。这项工作的关键是开发了一种催化剂,该催化剂有利于 δ-硝基酯途径而不是已建立的 Stetter 途径。该反应以高立体选择性进行,并提供以前未报道的顺式非对映异构体。我们还报告了一种用于合成 δ-内酰胺的操作简便的两步一锅法。